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ChangeLog
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@ -1,3 +1,8 @@
Thu Mar 22 16:25:10 CET 2007 Daniel Veillard <veillard@redhat.com>
* docs/*.html: repair the damages made by Amaya on the content
of documentation following feedback from Simon Hernandez
Thu Mar 22 11:35:05 CET 2007 Daniel Veillard <veillard@redhat.com>
* src/virsh.c: applied patch from Masayuki Sunou to avoid a bug

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NEWS
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@ -8,11 +8,22 @@ Releases
0.2.1: Mar 16 2007:
- Various internal cleanups (Richard Jones,Daniel Berrange,Mark McLoughlin)
- Bug fixes: libvirt_qemud daemon path (Daniel Berrange), libvirt
config directory (Daniel Berrange and Mark McLoughlin), memory leak in qemud (Mark), various fixes on network support (Mark), avoid Xen domain zombies on device hotplug errors (Daniel Berrange), various fixes on qemud (Mark),
argsparsing (Richard Jones), virsh -t argument (Saori Fukuta), avoid virsh
crash on TAB key (Daniel Berrange), detect xend operation failures (Kazuki Mizushima), don't listen on null socket (Rich Jones), read-only socket cleanup (Rich Jones), use of vnc port 5900 (Nobuhiro Itou), assorted networking fixes
(Daniel Berrange), shutoff and shutdown mismatches (Kazuki Mizushima), unlimited memory handling (Atsushi SAKAI), python binding fixes (Tatsuro Enokura)
- Build and portability fixes: IA64 fixes (Atsushi SAKAI), dependancies and build (Daniel Berrange), fix xend port detection (Daniel Berrange), icompile time warnings (Mark), avoid const related compiler warnings (Daniel Berrange), automated builds (Daniel Berrange), pointer/int mismatch (Richard Jones), configure time selection of drivers, libvirt spec hacking (Daniel Berrange)
config directory (Daniel Berrange and Mark McLoughlin), memory leak
in qemud (Mark), various fixes on network support (Mark), avoid Xen
domain zombies on device hotplug errors (Daniel Berrange), various
fixes on qemud (Mark), args parsing (Richard Jones), virsh -t argument
(Saori Fukuta), avoid virsh crash on TAB key (Daniel Berrange), detect
xend operation failures (Kazuki Mizushima), don't listen on null socket
(Rich Jones), read-only socket cleanup (Rich Jones), use of vnc port 5900
(Nobuhiro Itou), assorted networking fixes (Daniel Berrange), shutoff and
shutdown mismatches (Kazuki Mizushima), unlimited memory handling
(Atsushi SAKAI), python binding fixes (Tatsuro Enokura)
- Build and portability fixes: IA64 fixes (Atsushi SAKAI), dependancies
and build (Daniel Berrange), fix xend port detection (Daniel
Berrange), icompile time warnings (Mark), avoid const related
compiler warnings (Daniel Berrange), automated builds (Daniel
Berrange), pointer/int mismatch (Richard Jones), configure time
selection of drivers, libvirt spec hacking (Daniel Berrange)
- Add support for network autostart and init scripts (Mark McLoughlin)
- New API virConnectGetCapabilities() to detect the virtualization
capabilities of a host (Richard Jones)
@ -27,14 +38,14 @@ Releases
0.2.0: Feb 14 2007:
- Various internal cleanups (Mark McLoughlin, Richard Jones,Daniel
Berrange, Karel Zak)
- Bug fixes: avoid a crash in connect (Daniel Berrange), virsh
argsparsing (Richard Jones)
- Various internal cleanups (Mark McLoughlin, Richard Jones,
Daniel Berrange, Karel Zak)
- Bug fixes: avoid a crash in connect (Daniel Berrange), virsh args
parsing (Richard Jones)
- Add support for QEmu and KVM virtualization (Daniel Berrange)
- Add support for network configuration (Mark McLoughlin)
- Minor improvements: regression testing (Daniel Berrange),localization
string updates
- Minor improvements: regression testing (Daniel Berrange),
localization string updates
0.1.11: Jan 22 2007:
@ -46,18 +57,12 @@ Releases
0.1.10: Dec 20 2006:
- more localizations
- bug fixes: VCPU info breakages on xen 3.0.3, xenDaemonListDomains
buffer overflow (Daniel Berrange), reference count bug when creating Xen
domains (Daniel Berrange).
- improvements: support graphic framebuffer for Xen paravirt (Daniel
Berrange), VNC listen IP range support (Daniel Berrange), support for
default Xen config files and inactive domains of 3.0.4 (Daniel
Berrange).
- bug fixes: VCPU info breakages on xen 3.0.3, xenDaemonListDomains buffer overflow (Daniel Berrange), reference count bug when creating Xen domains (Daniel Berrange).
- improvements: support graphic framebuffer for Xen paravirt (Daniel Berrange), VNC listen IP range support (Daniel Berrange), support for default Xen config files and inactive domains of 3.0.4 (Daniel Berrange).
0.1.9: Nov 29 2006:
- python bindings: release interpeter lock when calling C (Daniel
Berrange)
- python bindings: release interpeter lock when calling C (Daniel Berrange)
- don't raise HTTP error when looking informations for a domain
- some refactoring to use the driver for all entry points
- better error reporting (Daniel Berrange)
@ -65,20 +70,15 @@ Releases
- provide XML parsing errors
- extension of the test framework (Daniel Berrange)
- fix the reconnect regression test
- python bindings: Domain instances now link to the Connect to avoid
garbage collection and disconnect
- separate the notion of maximum memory and current use at the XML
level
- python bindings: Domain instances now link to the Connect to avoid garbage collection and disconnect
- separate the notion of maximum memory and current use at the XML level
- Fix a memory leak (Daniel Berrange)
- add support for shareable drives
- add support for non-bridge style networking configs for guests(Daniel
Berrange)
- add support for non-bridge style networking configs for guests(Daniel Berrange)
- python bindings: fix unsigned long marshalling (Daniel Berrange)
- new config APIs virConfNew() and virConfSetValue() to build configs
from scratch
- new config APIs virConfNew() and virConfSetValue() to build configs from scratch
- hot plug device support based on Michel Ponceau patch
- added support for inactive domains, new APIs, various associated
cleanup (Daniel Berrange)
- added support for inactive domains, new APIs, various associated cleanup (Daniel Berrange)
- special device model for HVM guests (Daniel Berrange)
- add API to dump core of domains (but requires a patched xend)
- pygrub bootloader informations take over <os> informations
@ -86,78 +86,72 @@ Releases
0.1.8: Oct 16 2006:
- Bug for system with page size != 4k
- vcpu number initialization (Philippe Berthault)
- don't label crashed domains as shut off (Peter Vetere)
- fix virsh man page (Noriko Mizumoto)
- blktapdd support for alternate drivers like blktap (Daniel
Berrange)
- memory leak fixes (xend interface and XML parsing) (Daniel
Berrange)
- compile fix
- mlock/munlock size fixes (Daniel Berrange)
- improve error reporting
- Bug for system with page size != 4k
- vcpu number initialization (Philippe Berthault)
- don't label crashed domains as shut off (Peter Vetere)
- fix virsh man page (Noriko Mizumoto)
- blktapdd support for alternate drivers like blktap (Daniel Berrange)
- memory leak fixes (xend interface and XML parsing) (Daniel Berrange)
- compile fix
- mlock/munlock size fixes (Daniel Berrange)
- improve error reporting
0.1.7: Sep 29 2006:
- fix a memory bug on getting vcpu informations from xend (Daniel
Berrange)
- fix another problem in the hypercalls change in Xen
changeset86d26e6ec89b when getting domain informations (Daniel
Berrange)
- fix a memory bug on getting vcpu informations from xend (Daniel Berrange)
- fix another problem in the hypercalls change in Xen changeset
86d26e6ec89b when getting domain informations (Daniel Berrange)
0.1.6: Sep 22 2006:
- Support for localization of strings using gettext (Daniel Berrange)
- Support for new Xen-3.0.3 cdrom and disk configuration (Daniel
Berrange)
- Support for setting VNC port when creating domains with newxend config
files (Daniel Berrange)
- Support for new Xen-3.0.3 cdrom and disk configuration (Daniel Berrange)
- Support for setting VNC port when creating domains with new
xend config files (Daniel Berrange)
- Fix bug when running against xen-3.0.2 hypercalls (Jim Fehlig)
- Fix reconnection problem when talking directly to http xend
0.1.5: Sep 5 2006:
- Support for new hypercalls change in Xen changeset 86d26e6ec89b
- bug fixes: virParseUUID() was wrong, netwoking for paravirt
guestsi(Daniel Berrange), virsh on non-existent domains (Daniel
Berrange),string cast bug when handling error in python (Pete Vetere),
HTTP500 xend error code handling (Pete Vetere and Daniel Berrange)
- improvements: test suite for SEXPR <-> XML format conversions
(DanielBerrange), virsh output regression suite (Daniel Berrange), new
environvariable VIRSH_DEFAULT_CONNECT_URI for the default URI when
connecting(Daniel Berrange), graphical console support for paravirt
guests(Jeremy Katz), parsing of simple Xen config files (with Daniel
Berrange),early work on defined (not running) domains (Daniel
Berrange),virsh output improvement (Daniel Berrange
- bug fixes: virParseUUID() was wrong, netwoking for paravirt guestsi
(Daniel Berrange), virsh on non-existent domains (Daniel Berrange),
string cast bug when handling error in python (Pete Vetere), HTTP
500 xend error code handling (Pete Vetere and Daniel Berrange)
- improvements: test suite for SEXPR <-> XML format conversions (Daniel
Berrange), virsh output regression suite (Daniel Berrange), new environ
variable VIRSH_DEFAULT_CONNECT_URI for the default URI when connecting
(Daniel Berrange), graphical console support for paravirt guests
(Jeremy Katz), parsing of simple Xen config files (with Daniel Berrange),
early work on defined (not running) domains (Daniel Berrange),
virsh output improvement (Daniel Berrange
0.1.4: Aug 16 2006:
- bug fixes: spec file fix (Mark McLoughlin), error report problem
(withHugh Brock), long integer in Python bindings (with Daniel Berrange),
XMLgeneration bug for CDRom (Daniel Berrange), bug whem using number()
XPathfunction (Mark McLoughlin), fix python detection code, remove
duplicateinitialization errors (Daniel Berrange)
- improvements: UUID in XML description (Peter Vetere), proxy
codecleanup, virtual CPU and affinity support + virsh support
(MichelPonceau, Philippe Berthault, Daniel Berrange), port and tty
informationsfor console in XML (Daniel Berrange), added XML dump to
driver and proxysupport (Daniel Berrange), extention of boot options with
support forfloppy and cdrom (Daniel Berrange), features block in XML to
report/askPAE, ACPI, APIC for HVM domains (Daniel Berrange), fail
saide-effectoperations when using read-only connection, large
improvements to testdriver (Daniel Berrange)
- bug fixes: spec file fix (Mark McLoughlin), error report problem (with
Hugh Brock), long integer in Python bindings (with Daniel Berrange), XML
generation bug for CDRom (Daniel Berrange), bug whem using number() XPath
function (Mark McLoughlin), fix python detection code, remove duplicate
initialization errors (Daniel Berrange)
- improvements: UUID in XML description (Peter Vetere), proxy code
cleanup, virtual CPU and affinity support + virsh support (Michel
Ponceau, Philippe Berthault, Daniel Berrange), port and tty informations
for console in XML (Daniel Berrange), added XML dump to driver and proxy
support (Daniel Berrange), extention of boot options with support for
floppy and cdrom (Daniel Berrange), features block in XML to report/ask
PAE, ACPI, APIC for HVM domains (Daniel Berrange), fail saide-effect
operations when using read-only connection, large improvements to test
driver (Daniel Berrange)
- documentation: spelling (Daniel Berrange), test driver examples.
0.1.3: Jul 11 2006:
- bugfixes: build as non-root, fix xend access when root, handling
ofempty XML elements (Mark McLoughlin), XML serialization and parsing
fixes(Mark McLoughlin), allow to create domains without disk
(MarkMcLoughlin),
- improvement: xenDaemonLookupByID from O(n^2) to O(n) (Daniel
Berrange),support for fully virtualized guest (Jim Fehlig, DV, Mark
McLoughlin)
- bugfixes: build as non-root, fix xend access when root, handling of
empty XML elements (Mark McLoughlin), XML serialization and parsing fixes
(Mark McLoughlin), allow to create domains without disk (Mark
McLoughlin),
- improvement: xenDaemonLookupByID from O(n^2) to O(n) (Daniel Berrange),
support for fully virtualized guest (Jim Fehlig, DV, Mark McLoughlin)
- documentation: augmented to cover hvm domains
@ -167,57 +161,57 @@ Releases
0.1.1: Jun 21 2006:
- building fixes: ncurses fallback (Jim Fehlig), VPATH builds (Daniel
P.Berrange)
- driver cleanups: new entry points, cleanup of libvirt.c (with Daniel
P.Berrange)
- building fixes: ncurses fallback (Jim Fehlig), VPATH builds (Daniel P.
Berrange)
- driver cleanups: new entry points, cleanup of libvirt.c (with Daniel P.
Berrange)
- Cope with API change introduced in Xen changeset 10277
- new test driver for regression checks (Daniel P. Berrange)
- improvements: added UUID to XML serialization, buffer usage (KarelZak),
--connect argument to virsh (Daniel P. Berrange),
- bug fixes: uninitialized memory access in error reporting,
S-Exprparsing (Jim Fehlig, Jeremy Katz), virConnectOpen bug, remove a
TODO inxs_internal.c
- documentation: Python examples (David Lutterkort), new Perl bindingURL,
man page update (Karel Zak)
- improvements: added UUID to XML serialization, buffer usage (Karel
Zak), --connect argument to virsh (Daniel P. Berrange),
- bug fixes: uninitialized memory access in error reporting, S-Expr
parsing (Jim Fehlig, Jeremy Katz), virConnectOpen bug, remove a TODO in
xs_internal.c
- documentation: Python examples (David Lutterkort), new Perl binding
URL, man page update (Karel Zak)
0.1.0: Apr 10 2006:
- building fixes: --with-xen-distdir option (Ronald Aigner), out of
treebuild and pkginfo cflag fix (Daniel Berrange)
- enhancement and fixes of the XML description format (David
Lutterkortand Jim Fehlig)
- building fixes: --with-xen-distdir option (Ronald Aigner), out of tree
build and pkginfo cflag fix (Daniel Berrange)
- enhancement and fixes of the XML description format (David Lutterkort
and Jim Fehlig)
- new APIs: for Node information and Reboot
- internal code cleanup: refactoring internals into a driver model,
moreerror handling, structure sharing, thread safety and ref counting
- bug fixes: error message (Jim Meyering), error allocation in virsh
(JimMeyering), virDomainLookupByID (Jim Fehlig),
- documentation: updates on architecture, and format, typo fix
(JimMeyering)
- bindings: exception handling in examples (Jim Meyering), perl ones
outof tree (Daniel Berrange)
- virsh: more options, create, nodeinfo (Karel Zak), renaming of
someoptions (Karel Zak), use stderr only for errors (Karel Zak), man
page(Andrew Puch)
- internal code cleanup: refactoring internals into a driver model, more
error handling, structure sharing, thread safety and ref counting
- bug fixes: error message (Jim Meyering), error allocation in virsh (Jim
Meyering), virDomainLookupByID (Jim Fehlig),
- documentation: updates on architecture, and format, typo fix (Jim
Meyering)
- bindings: exception handling in examples (Jim Meyering), perl ones out
of tree (Daniel Berrange)
- virsh: more options, create, nodeinfo (Karel Zak), renaming of some
options (Karel Zak), use stderr only for errors (Karel Zak), man page
(Andrew Puch)
0.0.6: Feb 28 2006:
- add UUID lookup and extract API
- add error handling APIs both synchronous and asynchronous
- added minimal hook for error handling at the python level, improved
thepython bindings
- added minimal hook for error handling at the python level, improved the
python bindings
- augment the documentation and tests to cover error handling
0.0.5: Feb 23 2006:
- Added XML description parsing, dependance to libxml2, implemented
thecreation API virDomainCreateLinux()
- Added XML description parsing, dependance to libxml2, implemented the
creation API virDomainCreateLinux()
- new APIs to lookup and name domain by UUID
- fixed the XML dump when using the Xend access
- Fixed a few more problem related to the name change
- Adding regression tests in python and examples in C
- web site improvement, extended the documentation to cover the XMLformat
and Python API
- web site improvement, extended the documentation to cover the XML
format and Python API
- Added devhelp help for Gnome/Gtk programmers
@ -233,8 +227,8 @@ Releases
0.0.2: Jan 29 2006:
- Update of the documentation, web site redesign (Diana Fong)
- integration of HTTP xend RPC based on libxend by Anthony Liquori
formost operations
- integration of HTTP xend RPC based on libxend by Anthony Liquori for
most operations
- Adding Save and Restore APIs
- extended the virsh command line tool (Karel Zak)
- remove xenstore transactions (Anthony Liguori)

82
docs/FAQ.html
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@ -5,49 +5,48 @@
<li><a href="FAQ.html#Compilatio">Compilation</a></li>
<li><a href="FAQ.html#Developer">Developer corner</a></li>
</ul><h3><a name="License" id="License">License</a>(s)</h3><ol><li><em>Licensing Terms for libvirt</em>
<p>libvirt is released under the <a href="http://www.opensource.org/licenses/lgpl-license.html">GNU
LesserGeneral Public License</a>, see the file COPYING.LIB in the
distributionfor the precise wording. The only library that libvirt
depends upon isthe Xen store access library which is also licenced under
the LGPL.</p>
<p>libvirt is released under the <a href="http://www.opensource.org/licenses/lgpl-license.html">GNU Lesser
General Public License</a>, see the file COPYING.LIB in the distribution
for the precise wording. The only library that libvirt depends upon is
the Xen store access library which is also licenced under the LGPL.</p>
</li>
<li><em>Can I embed libvirt in a proprietary application ?</em>
<p>Yes. The LGPL allows you to embed libvirt into a
proprietaryapplication. It would be graceful to send-back bug fixes and
improvementsas patches for possible incorporation in the main development
tree. Itwill decrease your maintainance costs anyway if you do so.</p>
<p>Yes. The LGPL allows you to embed libvirt into a proprietary
application. It would be graceful to send-back bug fixes and improvements
as patches for possible incorporation in the main development tree. It
will decrease your maintainance costs anyway if you do so.</p>
</li>
</ol><h3><a name="Installati" id="Installati">Installation</a></h3><ol><li><em>Where can I get libvirt</em>?
</ol><h3><a name="Installati" id="Installati">Installation</a></h3><ol><li><em>Where can I get libvirt</em> ?
<p>The original distribution comes from <a href="ftp://libvirt.org/libvirt/">ftp://libvirt.org/libvirt/</a>.</p>
</li>
<li><em>I can't install the libvirt/libvirt-devel RPM packages due tofailed
dependencies</em>
<p>The most generic solution is to re-fetch the latest src.rpm ,
andrebuild it locally with</p>
<li><em>I can't install the libvirt/libvirt-devel RPM packages due to
failed dependencies</em>
<p>The most generic solution is to re-fetch the latest src.rpm , and
rebuild it locally with</p>
<p><code>rpm --rebuild libvirt-xxx.src.rpm</code>.</p>
<p>If everything goes well it will generate two binary rpm packages
(oneproviding the shared libs and virsh, and the other one, the
-develpackage, providing includes, static libraries and scripts needed to
buildapplications with libvirt that you can install locally.</p>
<p>If everything goes well it will generate two binary rpm packages (one
providing the shared libs and virsh, and the other one, the -devel
package, providing includes, static libraries and scripts needed to build
applications with libvirt that you can install locally.</p>
<p>One can also rebuild the RPMs from a tarball:</p>
<p><code>rpmbuild -ta libdir-xxx.tar.gz</code></p>
<p>Or from a configured tree with:</p>
<p><code>make rpm</code></p>
</li>
<li><em>Failure to use the API for non-root users</em>
<p>Large parts of the API may only be accessible with root
priviledges,however the read only access to the xenstore data doesnot
have to beforbidden to user, at least for monitoring purposes. If "virsh
dominfo"fails to run as an user, change the mode of the xenstore
read-only socketwith:</p>
<p>Large parts of the API may only be accessible with root priviledges,
however the read only access to the xenstore data doesnot have to be
forbidden to user, at least for monitoring purposes. If "virsh dominfo"
fails to run as an user, change the mode of the xenstore read-only socket
with:</p>
<p><code>chmod 666 /var/run/xenstored/socket_ro</code></p>
<p>and also make sure that the Xen Daemon is running correctly with
localHTTP server enabled, this is defined
in<code>/etc/xen/xend-config.sxp</code>which need the following line to
beenabled:</p>
<p>and also make sure that the Xen Daemon is running correctly with local
HTTP server enabled, this is defined in
<code>/etc/xen/xend-config.sxp</code> which need the following line to be
enabled:</p>
<p><code>(xend-http-server yes)</code></p>
<p>If needed restart the xend daemon after making the change with
thefollowing command run as root:</p>
<p>If needed restart the xend daemon after making the change with the
following command run as root:</p>
<p><code>service xend restart</code></p>
</li>
</ol><h3><a name="Compilatio" id="Compilatio">Compilation</a></h3><ol><li><em>What is the process to compile libvirt ?</em>
@ -59,24 +58,23 @@
<p><code>./configure [possible options]</code></p>
<p><code>make</code></p>
<p><code>make install</code></p>
<p>At that point you may have to rerun ldconfig or a similar utility
toupdate your list of installed shared libs.</p>
<p>At that point you may have to rerun ldconfig or a similar utility to
update your list of installed shared libs.</p>
</li>
<li><em>What other libraries are needed to compile/install libvirt ?</em>
<p>Libvirt requires libxenstore, which is usually provided by the
xenpackages as well as the public headers to compile against
libxenstore.</p>
<p>Libvirt requires libxenstore, which is usually provided by the xen
packages as well as the public headers to compile against libxenstore.</p>
</li>
<li><em>I use the CVS version and there is no configure script</em>
<p>The configure script (and other Makefiles) are generated. Use
theautogen.sh script to regenerate the configure script and
Makefiles,like:</p>
<p>The configure script (and other Makefiles) are generated. Use the
autogen.sh script to regenerate the configure script and Makefiles,
like:</p>
<p><code>./autogen.sh --prefix=/usr --disable-shared</code></p>
</li>
</ol><h3><a name="Developer" id="Developer">Developer</a>corner</h3><ol><li><em>Troubles compiling or linking programs using libvirt</em>
<p>To simplify the process of reusing the library, libvirt comes
withpkgconfig support, which can be used directly from autoconf support
orvia the pkg-config command line tool, like:</p>
</ol><h3><a name="Developer" id="Developer">Developer</a> corner</h3><ol><li><em>Troubles compiling or linking programs using libvirt</em>
<p>To simplify the process of reusing the library, libvirt comes with
pkgconfig support, which can be used directly from autoconf support or
via the pkg-config command line tool, like:</p>
<p><code>pkg-config libvirt --libs</code></p>
</li>
</ol></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
</ol></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>libvirt architecture</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">libvirt architecture</h1><p>Currently libvirt supports 2 kind of virtualization, and its
internalstructure is based on a driver model which simplifies adding new
internal structure is based on a driver model which simplifies adding new
engines:</p><ul><li><a href="#Xen">Xen hypervisor</a></li>
<li><a href="#QEmu">QEmu and KVM based virtualization</a></li>
<li><a href="#drivers">the driver architecture</a></li>
</ul><h3><a name="Xen" id="Xen">Libvirt Xen support</a></h3><p>When running in a Xen environment, programs using libvirt have to
executein "Domain 0", which is the primary Linux OS loaded on the machine.
That OSkernel provides most if not all of the actual drivers used by the set
ofdomains. It also runs the Xen Store, a database of informations shared by
thehypervisor, the kernels, the drivers and the xen daemon. Xend. The xen
daemonsupervise the control and execution of the sets of domains. The
hypervisor,drivers, kernels and daemons communicate though a shared system
busimplemented in the hypervisor. The figure below tries to provide a view
ofthis environment:</p><img src="architecture.gif" alt="The Xen architecture" /><p>The library can be initialized in 2 ways depending on the level
ofpriviledge of the embedding program. If it runs with root
access,virConnectOpen() can be used, it will use different ways to connect
tothe Xen infrastructure:</p><ul><li>a connection to the Xen Daemon though an HTTP RPC layer</li>
</ul><h3><a name="Xen" id="Xen">Libvirt Xen support</a></h3><p>When running in a Xen environment, programs using libvirt have to execute
in "Domain 0", which is the primary Linux OS loaded on the machine. That OS
kernel provides most if not all of the actual drivers used by the set of
domains. It also runs the Xen Store, a database of informations shared by the
hypervisor, the kernels, the drivers and the xen daemon. Xend. The xen daemon
supervise the control and execution of the sets of domains. The hypervisor,
drivers, kernels and daemons communicate though a shared system bus
implemented in the hypervisor. The figure below tries to provide a view of
this environment:</p><img src="architecture.gif" alt="The Xen architecture" /><p>The library can be initialized in 2 ways depending on the level of
priviledge of the embedding program. If it runs with root access,
virConnectOpen() can be used, it will use three different ways to connect to
the Xen infrastructure:</p><ul><li>a connection to the Xen Daemon though an HTTP RPC layer</li>
<li>a read/write connection to the Xen Store</li>
<li>use Xen Hypervisor calls</li>
<li>when used as non-root libvirt connect to a proxy daemon runningas root
and providing read-only support</li>
</ul><p>The library will usually interact with the Xen daemon for any
operationchanging the state of the system, but for performance and accuracy
reasonsmay talk directly to the hypervisor when gathering state informations
atleast when possible (i.e. when the running program using libvirt has
rootpriviledge access).</p><p>If it runs without root access virConnectOpenReadOnly() should be used
toconnect to initialize the library. It will then fork a libvirt_proxy
programrunning as root and providing read_only access to the API, this is
thenonly useful for reporting and monitoring.</p><h3><a name="QEmu" id="QEmu">Libvirt QEmu and KVM support</a></h3><p>The model for QEmu and KVM is completely similar, basically KVM isbased on
QEmu for the process controlling a new domain, only small detailsdiffers
between the two. In both case the libvirt API is providedby a controlling
process forked by libvirt in the background andwhich launch and control the
QEmu or KVM process. That program calledlibvirt_qemud talks though a specific
protocol to the library, andconnects to the console of the QEmu process in
order to control andreport on its status. Libvirt tries to expose all the
emulationsmodels of QEmu, the selection is done when creating the new
domain,by specifying the architecture and machine type targetted.</p><p>The code controlling the QEmu process is available in
the<code>qemud/</code>subdirectory.</p><h3><a name="drivers" id="drivers">the driver based architecture</a></h3><p>As the previous section explains, libvirt can communicate using
differentchannels with the Xen hypervisor, and is also able to use different
kindof hypervisor. To simplify the internal design, code, easemaintainance
and simplify the support of other virtualization engine theinternals have
been structured as one core component, the libvirt.c moduleacting as a
front-end for the library API and a set of hypvisor driversdefining a common
set of routines. That way the Xen Daemon accces, the XenStore one, the
Hypervisor hypercall are all isolated in separate C modulesimplementing at
least a subset of the common operations defined by thedrivers present in
driver.h. The driver architecture is used to add supportfor other
virtualization engines and</p><ul><li>xend_internal: implements the driver functions though the
XenDaemon.</li>
<li>xs_internal: implements the subset of the driver availble though theXen
Store.</li>
<li>xen_internal: provide the implementation of the functions possible
viadirect Xen hypervisor access.</li>
<li>proxy_internal: provide read-only Xen access via a proxy, the proxycode
is in the <code>proxy/</code>sub directory.</li>
<li>when used as non-root libvirt connect to a proxy daemon running
as root and providing read-only support</li>
</ul><p>The library will usually interact with the Xen daemon for any operation
changing the state of the system, but for performance and accuracy reasons
may talk directly to the hypervisor when gathering state informations at
least when possible (i.e. when the running program using libvirt has root
priviledge access).</p><p>If it runs without root access virConnectOpenReadOnly() should be used to
connect to initialize the library. It will then fork a libvirt_proxy
program running as root and providing read_only access to the API, this is
then only useful for reporting and monitoring.</p><h3><a name="QEmu" id="QEmu">Libvirt QEmu and KVM support</a></h3><p>The model for QEmu and KVM is completely similar, basically KVM is based
on QEmu for the process controlling a new domain, only small details differs
between the two. In both case the libvirt API is provided by a controlling
process forked by libvirt in the background and which launch and control the
QEmu or KVM process. That program called libvirt_qemud talks though a specific
protocol to the library, and connects to the console of the QEmu process in
order to control and report on its status. Libvirt tries to expose all the
emulations models of QEmu, the selection is done when creating the new
domain, by specifying the architecture and machine type targetted.</p><p>The code controlling the QEmu process is available in the
<code>qemud/</code> directory.</p><h3><a name="drivers" id="drivers">the driver based architecture</a></h3><p>As the previous section explains, libvirt can communicate using different
channels with the current hypervisor, and should also be able to use
different kind of hypervisor. To simplify the internal design, code, ease
maintainance and simplify the support of other virtualization engine the
internals have been structured as one core component, the libvirt.c module
acting as a front-end for the library API and a set of hypvisor drivers
defining a common set of routines. That way the Xen Daemon accces, the Xen
Store one, the Hypervisor hypercall are all isolated in separate C modules
implementing at least a subset of the common operations defined by the
drivers present in driver.h:</p><ul><li>xend_internal: implements the driver functions though the Xen
Daemon</li>
<li>xs_internal: implements the subset of the driver availble though the
Xen Store</li>
<li>xen_internal: provide the implementation of the functions possible via
direct hypervisor access</li>
<li>proxy_internal: provide read-only Xen access via a proxy, the proxy code
is in the <code>proxy/</code>directory.</li>
<li>xm_internal: provide support for Xen defined but not running
domains.</li>
domains.</li>
<li>qemu_internal: implement the driver functions for QEmu and
KVMvirtualization engines. It also uses a qemud/ specific daemon
whichinterracts with the QEmu process to implement libvirt API.</li>
<li>test: this is a test driver useful for regression tests of thefront-end
part of libvirt.</li>
</ul><p>Note that a given driver may only implement a subset of those
functions,for example saving a Xen domain state to disk and restoring it is
only possiblethough the Xen Daemon, in that case the driver entry points are
initialized toNULL.</p><p></p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
KVM virtualization engines. It also uses a qemud/ specific daemon
which interracts with the QEmu process to implement libvirt API.</li>
<li>test: this is a test driver useful for regression tests of the
front-end part of libvirt.</li>
</ul><p>Note that a given driver may only implement a subset of those functions,
(for example saving a Xen domain state to disk and restoring it is only
possible though the Xen Daemon), in that case the driver entry points for
unsupported functions are initialized to NULL.</p><p></p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Reporting bugs and getting help</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Reporting bugs and getting help</h1><p>There is a mailing-list <a href="mailto:libvir-list@redhat.com">libvir-list@redhat.com</a>for
libvirt,with an <a href="https://www.redhat.com/archives/libvir-list/">on-linearchive</a>.
Please subscribe to this list before posting by visiting the <a href="https://www.redhat.com/mailman/listinfo/libvir-list">associated
Web</a>page and follow the instructions. Patches with explanations and
provided asattachments are really appreciated and will be discussed on the
mailing list.If possible generate the patches by using cvs diff -u in a CVS
checkout.</p><p>We use Red Hat Bugzilla to track bugs to libvirt. If you want to report
abug, please check <a href="http://bugzilla.redhat.com/bugzilla/buglist.cgi?component=libvirt&amp;component=libvirt-devel&amp;component=libvirt-python&amp;bug_status=ASSIGNED&amp;bug_status=INVESTIGATE&amp;bug_status=NEW&amp;bug_status=REOPENED&amp;bug_status=VERIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr&amp;long_desc=&amp;Search=Search">the
existing open bugs</a>, then if yours isn't a duplicate ofan existing bug, <a href="http://bugzilla.redhat.com/bugzilla/enter_bug.cgi?product=Fedora%20Core&amp;component=libvirt">log
a new bug</a>. It may be goodto post to the <a href="mailto:libvir-list@redhat.com">mailing-list</a>too if the issue looks
serious, thanks !</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Reporting bugs and getting help</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Reporting bugs and getting help</h1><p>There is a mailing-list <a href="mailto:libvir-list@redhat.com">libvir-list@redhat.com</a> for libvirt,
with an <a href="https://www.redhat.com/archives/libvir-list/">on-line
archive</a>. Please subscribe to this list before posting by visiting the <a href="https://www.redhat.com/mailman/listinfo/libvir-list">associated Web</a>
page and follow the instructions. Patches with explanations and provided as
attachments are really appreciated and will be discussed on the mailing list.
If possible generate the patches by using cvs diff -u in a CVS checkout.</p><p>We use Red Hat Bugzilla to track bugs to libvirt. If you want to report a
bug, please check <a href="http://bugzilla.redhat.com/bugzilla/buglist.cgi?component=libvirt&amp;component=libvirt-devel&amp;component=libvirt-python&amp;bug_status=ASSIGNED&amp;bug_status=INVESTIGATE&amp;bug_status=NEW&amp;bug_status=REOPENED&amp;bug_status=VERIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr&amp;long_desc=&amp;Search=Search">the existing open bugs</a>, then if yours isn't a duplicate of
an existing bug, <a href="http://bugzilla.redhat.com/bugzilla/enter_bug.cgi?product=Fedora%20Core&amp;component=libvirt">log a new bug</a>. It may be good
to post to the <a href="mailto:libvir-list@redhat.com">mailing-list</a>
too if the issue looks serious, thanks !</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Downloads</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Downloads</h1><p>The latest versions of libvirt can be found on the <a href="ftp://libvirt.org/libvirt/">libvirt.org</a>server ( <a href="http://libvirt.org/sources/">HTTP</a>, <a href="ftp://libvirt.org/libvirt/">FTP</a>). You will find there the
releasedversions as well as <a href="http://libvirt.org/sources/libvirt-cvs-snapshot.tar.gz">snapshottarballs</a>updated
from CVS head every hour</p><p>Anonymous <a href="http://ximbiot.com/cvs/cvshome/docs/">CVS</a>is
alsoavailable, first register onto the server:</p><p><code>cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs login</code></p><p>it will request a password, enter <strong>anoncvs</strong>. Then you
cancheckout the development tree with:</p><p><code>cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs
colibvirt</code></p><p>Use ./autogen.sh to configure the local checkout, then
<code>make</code>and <code>make install</code>, as usual. All normal cvs
commands are nowavailable except commiting to the base.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Downloads</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Downloads</h1><p>The latest versions of libvirt can be found on the <a href="ftp://libvirt.org/libvirt/">libvirt.org</a> server ( <a href="http://libvirt.org/sources/">HTTP</a>, <a href="ftp://libvirt.org/libvirt/">FTP</a>). You will find there the released
versions as well as <a href="http://libvirt.org/sources/libvirt-cvs-snapshot.tar.gz">snapshot
tarballs</a> updated from CVS head every hour</p><p>Anonymous <a href="http://ximbiot.com/cvs/cvshome/docs/">CVS</a> is also
available, first register onto the server:</p><p><code>cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs login</code></p><p>it will request a password, enter <strong>anoncvs</strong>. Then you can
checkout the development tree with:</p><p><code>cvs -d :pserver:anoncvs@libvirt.org:2401/data/cvs co
libvirt</code></p><p>Use ./autogen.sh to configure the local checkout, then <code>make</code>
and <code>make install</code>, as usual. All normal cvs commands are now
available except commiting to the base.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Handling of errors</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Handling of errors</h1><p>The main goals of libvirt when it comes to error handling are:</p><ul><li>provide as much detail as possible</li>
<li>provide the informations as soon as possible</li>
<li>dont force the library user into one style of error handling</li>
</ul><p>As result the library provide both synchronous, callback based
andasynchronous error reporting. When an error happens in the library code
theerror is logged, allowing to retrieve it later and if the user registered
anerror callback it will be called synchronously. Once the call to libvirt
endsthe error can be detected by the return value and the full information
forthe last logged error can be retrieved.</p><p>To avoid as much as prossible troubles with a global variable in
amultithreaded environment, libvirt will associate when possible the errors
tothe current connection they are related to, that way the error is stored in
adynamic structure which can be made thread specific. Error callback can
beset specifically to a connection with</p><p>So error handling in the code is the following:</p><ol><li>if the error can be associated to a connection for example when
failingto look up a domain
<ol><li>if there is a callback associated to the connection set with <a href="html/libvirt-virterror.html#virConnSetErrorFunc">virConnSetErrorFunc</a>,call
it with the error informations</li>
<li>otherwise if there is a global callback set with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>,call
it with the error information</li>
<li>otherwise call <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>which
is the default error function of the library issuing the erroron
stderr</li>
</ul><p>As result the library provide both synchronous, callback based and
asynchronous error reporting. When an error happens in the library code the
error is logged, allowing to retrieve it later and if the user registered an
error callback it will be called synchronously. Once the call to libvirt ends
the error can be detected by the return value and the full information for
the last logged error can be retrieved.</p><p>To avoid as much as prossible troubles with a global variable in a
multithreaded environment, libvirt will associate when possible the errors to
the current connection they are related to, that way the error is stored in a
dynamic structure which can be made thread specific. Error callback can be
set specifically to a connection with</p><p>So error handling in the code is the following:</p><ol><li>if the error can be associated to a connection for example when failing
to look up a domain
<ol><li>if there is a callback associated to the connection set with <a href="html/libvirt-virterror.html#virConnSetErrorFunc">virConnSetErrorFunc</a>,
call it with the error informations</li>
<li>otherwise if there is a global callback set with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>,
call it with the error information</li>
<li>otherwise call <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>
which is the default error function of the library issuing the error
on stderr</li>
<li>save the error in the connection for later retrieval with <a href="html/libvirt-virterror.html#virConnGetLastError">virConnGetLastError</a></li>
</ol></li>
<li>otherwise like when failing to create an hypervisor connection:
<ol><li>if there is a global callback set with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>,call
it with the error information</li>
<li>otherwise call <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>which
is the default error function of the library issuing the erroron
stderr</li>
<ol><li>if there is a global callback set with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>,
call it with the error information</li>
<li>otherwise call <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>
which is the default error function of the library issuing the error
on stderr</li>
<li>save the error in the connection for later retrieval with <a href="html/libvirt-virterror.html#virGetLastError">virGetLastError</a></li>
</ol></li>
</ol><p>In all cases the error informations are provided as a <a href="html/libvirt-virterror.html#virErrorPtr">virErrorPtr</a>pointer
toread-only structure <a href="html/libvirt-virterror.html#virError">virError</a>containing
thefollowing fields:</p><ul><li>code: an error number from the <a href="html/libvirt-virterror.html#virErrorNumber">virErrorNumber</a>enum</li>
<li>domain: an enum indicating which part of libvirt raised the error see<a href="html/libvirt-virterror.html#virErrorDomain">virErrorDomain</a></li>
<li>level: the error level, usually VIR_ERR_ERROR, though there is room
forwarnings like VIR_ERR_WARNING</li>
</ol><p>In all cases the error informations are provided as a <a href="html/libvirt-virterror.html#virErrorPtr">virErrorPtr</a> pointer to
read-only structure <a href="html/libvirt-virterror.html#virError">virError</a> containing the
following fields:</p><ul><li>code: an error number from the <a href="html/libvirt-virterror.html#virErrorNumber">virErrorNumber</a>
enum</li>
<li>domain: an enum indicating which part of libvirt raised the error see
<a href="html/libvirt-virterror.html#virErrorDomain">virErrorDomain</a></li>
<li>level: the error level, usually VIR_ERR_ERROR, though there is room for
warnings like VIR_ERR_WARNING</li>
<li>message: the full human-readable formatted string of the error</li>
<li>conn: if available a pointer to the <a href="html/libvirt-libvirt.html#virConnectPtr">virConnectPtr</a>connection
to the hypervisor where this happened</li>
<li>dom: if available a pointer to the <a href="html/libvirt-libvirt.html#virDomainPtr">virDomainPtr</a>domaintargetted
in the operation</li>
</ul><p>and then extra raw informations about the error which may be initializedto
0 or NULL if unused</p><ul><li>str1, str2, str3: string informations, usually str1 is the errormessage
format</li>
<li>conn: if available a pointer to the <a href="html/libvirt-libvirt.html#virConnectPtr">virConnectPtr</a>
connection to the hypervisor where this happened</li>
<li>dom: if available a pointer to the <a href="html/libvirt-libvirt.html#virDomainPtr">virDomainPtr</a> domain
targetted in the operation</li>
</ul><p>and then extra raw informations about the error which may be initialized
to 0 or NULL if unused</p><ul><li>str1, str2, str3: string informations, usually str1 is the error
message format</li>
<li>int1, int2: integer informations</li>
</ul><p>So usually, setting up specific error handling with libvirt consist
ofregistering an handler with with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a>orwith
<a href="html/libvirt-virterror.html#virConnSetErrorFunc">virConnSetErrorFunc</a>,chech
the value of the code value, take appropriate action, if needed letlibvirt
print the error on stderr by calling <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>.For
asynchronous error handing, set such a function doing nothing to avoidthe
error being reported on stderr, and call virConnGetLastError
orvirGetLastError when an API call returned an error value. It can be a
goodidea to use <a href="html/libvirt-virterror.html#virResetLastError">virResetError</a>or <a href="html/libvirt-virterror.html#virConnResetLastError">virConnResetLastError</a>once
an error has been processed fully.</p><p>At the python level, there only a global reporting callback function
atthis point, see the error.py example about it:</p><pre>def handler(ctxt, err):
</ul><p>So usually, setting up specific error handling with libvirt consist of
registering an handler with with <a href="html/libvirt-virterror.html#virSetErrorFunc">virSetErrorFunc</a> or
with <a href="html/libvirt-virterror.html#virConnSetErrorFunc">virConnSetErrorFunc</a>,
chech the value of the code value, take appropriate action, if needed let
libvirt print the error on stderr by calling <a href="html/libvirt-virterror.html#virDefaultErrorFunc">virDefaultErrorFunc</a>.
For asynchronous error handing, set such a function doing nothing to avoid
the error being reported on stderr, and call virConnGetLastError or
virGetLastError when an API call returned an error value. It can be a good
idea to use <a href="html/libvirt-virterror.html#virResetLastError">virResetError</a> or <a href="html/libvirt-virterror.html#virConnResetLastError">virConnResetLastError</a>
once an error has been processed fully.</p><p>At the python level, there only a global reporting callback function at
this point, see the error.py example about it:</p><pre>def handler(ctxt, err):
global errno
#print "handler(%s, %s)" % (ctxt, err)
errno = err
libvirt.registerErrorHandler(handler, 'context') </pre><p>the second argument to the registerErrorHandler function is passed as
thefist argument of the callback like in the C version. The error is a
tuplecontaining the same field as a virError in C, but cast to Python.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
libvirt.registerErrorHandler(handler, 'context') </pre><p>the second argument to the registerErrorHandler function is passed as the
fist argument of the callback like in the C version. The error is a tuple
containing the same field as a virError in C, but cast to Python.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>XML Formats</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">XML Formats</h1><p>This section describes the XML formats used mostly to represent domains,
there are variations on the format based on the kind of domains run and the
options used to launch them:</p><ul><li><a href="#Normal1">Normal paravirtualized Xen domains</a></li>
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>XML Format</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">XML Format</h1><p>This section describes the XML format used to represent domains, there are
variations on the format based on the kind of domains run and the options
used to launch them:</p><ul><li><a href="#Normal1">Normal paravirtualized Xen domains</a></li>
<li><a href="#Fully1">Fully virtualized Xen domains</a></li>
<li><a href="#KVM1">KVM domains</a></li>
<li><a href="#Net1">Networking options for QEmu and KVM</a></li>
<li><a href="#QEmu1">QEmu domains</a></li>
<li><a href="#Capa1">Discovering virtualization capabilities</a></li>
</ul><p>The formats try as much as possible to follow the same structure and reuse
elements and attributes where it makes sense.</p><h3 id="Normal"><a name="Normal1" id="Normal1">Normal paravirtualized
Xendomains</a>:</h3><p>The library use an XML format to describe domains, as input to <a href="html/libvirt-libvirt.html#virDomainCreateLinux">virDomainCreateLinux()</a>and
as the output of <a href="html/libvirt-libvirt.html#virDomainGetXMLDesc">virDomainGetXMLDesc()</a>,the
following is an example of the format as returned by the shell
command<code>virsh xmldump fc4</code>, where fc4 was one of the running
domains:</p><pre>&lt;domain type='xen' <span style="color: #0071FF; background-color: #FFFFFF">id='18'</span>&gt;
elements and attributes where it makes sense.</p><h3 id="Normal"><a name="Normal1" id="Normal1">Normal paravirtualized Xen
guests</a>:</h3><p>The library use an XML format to describe domains, as input to <a href="html/libvirt-libvirt.html#virDomainCreateLinux">virDomainCreateLinux()</a>
and as the output of <a href="html/libvirt-libvirt.html#virDomainGetXMLDesc">virDomainGetXMLDesc()</a>,
the following is an example of the format as returned by the shell command
<code>virsh xmldump fc4</code> , where fc4 was one of the running domains:</p><pre>&lt;domain type='xen' <span style="color: #0071FF; background-color: #FFFFFF">id='18'</span>&gt;
&lt;name&gt;fc4&lt;/name&gt;
<span style="color: #00B200; background-color: #FFFFFF">&lt;os&gt;
&lt;type&gt;linux&lt;/type&gt;
@ -37,72 +36,70 @@ domains:</p><pre>&lt;domain type='xen' <span style="color: #0071FF; background-c
&lt;/interface&gt;</span>
<span style="color: #FF8000; background-color: #FFFFFF">&lt;console tty='/dev/pts/5'/&gt;</span>
&lt;/devices&gt;
&lt;/domain&gt;</pre><p>The root element must be called <code>domain</code>with no namespace,
the<code>type</code>attribute indicates the kind of hypervisor used, 'xen'
isthe default value. The <code>id</code>attribute gives the domain id
atruntime (not however that this may change, for example if the domain is
savedto disk and restored). The domain has a few children whose order is
notsignificant:</p><ul><li>name: the domain name, preferably ASCII based</li>
&lt;/domain&gt;</pre><p>The root element must be called <code>domain</code> with no namespace, the
<code>type</code> attribute indicates the kind of hypervisor used, 'xen' is
the default value. The <code>id</code> attribute gives the domain id at
runtime (not however that this may change, for example if the domain is saved
to disk and restored). The domain has a few children whose order is not
significant:</p><ul><li>name: the domain name, preferably ASCII based</li>
<li>memory: the maximum memory allocated to the domain in kilobytes</li>
<li>vcpu: the number of virtual cpu configured for the domain</li>
<li>os: a block describing the Operating System, its content will
bedependant on the OS type
<li>os: a block describing the Operating System, its content will be
dependant on the OS type
<ul><li>type: indicate the OS type, always linux at this point</li>
<li>kernel: path to the kernel on the Domain 0 filesystem</li>
<li>initrd: an optional path for the init ramdisk on the Domain
0filesystem</li>
<li>initrd: an optional path for the init ramdisk on the Domain 0
filesystem</li>
<li>cmdline: optional command line to the kernel</li>
<li>root: the root filesystem from the guest viewpoint, it may bepassed
as part of the cmdline content too</li>
<li>root: the root filesystem from the guest viewpoint, it may be
passed as part of the cmdline content too</li>
</ul></li>
<li>devices: a list of <code>disk</code>,
<code>interface</code>and<code>console</code>descriptions in no special
order</li>
</ul><p>The format of the devices and their type may grow over time, but
thefollowing should be sufficient for basic use:</p><p>A <code>disk</code>device indicates a block device, it can have twovalues
for the type attribute either 'file' or 'block' corresponding to the 2options
availble at the Xen layer. It has two mandatory children, and oneoptional one
in no specific order:</p><ul><li>source with a file attribute containing the path in Domain 0 to thefile
or a dev attribute if using a block device, containing the devicename
('hda5' or '/dev/hda5')</li>
<li>target indicates in a dev attribute the device where it is mapped inthe
guest</li>
<li>readonly an optional empty element indicating the device
isread-only</li>
</ul><p>An <code>interface</code>element describes a network device mapped on
theguest, it also has a type whose value is currently 'bridge', it also have
anumber of children in no specific order:</p><ul><li>source: indicating the bridge name</li>
<li>devices: a list of <code>disk</code>, <code>interface</code> and
<code>console</code> descriptions in no special order</li>
</ul><p>The format of the devices and their type may grow over time, but the
following should be sufficient for basic use:</p><p>A <code>disk</code> device indicates a block device, it can have two
values for the type attribute either 'file' or 'block' corresponding to the 2
options availble at the Xen layer. It has two mandatory children, and one
optional one in no specific order:</p><ul><li>source with a file attribute containing the path in Domain 0 to the
file or a dev attribute if using a block device, containing the device
name ('hda5' or '/dev/hda5')</li>
<li>target indicates in a dev attribute the device where it is mapped in
the guest</li>
<li>readonly an optional empty element indicating the device is
read-only</li>
</ul><p>An <code>interface</code> element describes a network device mapped on the
guest, it also has a type whose value is currently 'bridge', it also have a
number of children in no specific order:</p><ul><li>source: indicating the bridge name</li>
<li>mac: the optional mac address provided in the address attribute</li>
<li>ip: the optional IP address provided in the address attribute</li>
<li>script: the script used to bridge the interfcae in the Domain 0</li>
<li>target: and optional target indicating the device name.</li>
</ul><p>A <code>console</code>element describes a serial console connection tothe
guest. It has no children, and a single attribute
<code>tty</code>whichprovides the path to the Pseudo TTY on which the guest
console can beaccessed</p><p>Life cycle actions for the domain can also be expressed in the XML
format,they drive what should be happening if the domain crashes, is rebooted
or ispoweroff. There is various actions possible when this happen:</p><ul><li>destroy: The domain is cleaned up (that's the default normal
processingin Xen)</li>
<li>restart: A new domain is started in place of the old one with the
sameconfiguration parameters</li>
<li>preserve: The domain will remain in memory until it is
destroyedmanually, it won't be running but allows for post-mortem
debugging</li>
<li>rename-restart: a variant of the previous one but where the old
domainis renamed before being saved to allow a restart</li>
</ul><p>A <code>console</code> element describes a serial console connection to
the guest. It has no children, and a single attribute <code>tty</code> which
provides the path to the Pseudo TTY on which the guest console can be
accessed</p><p>Life cycle actions for the domain can also be expressed in the XML format,
they drive what should be happening if the domain crashes, is rebooted or is
poweroff. There is various actions possible when this happen:</p><ul><li>destroy: The domain is cleaned up (that's the default normal processing
in Xen)</li>
<li>restart: A new domain is started in place of the old one with the same
configuration parameters</li>
<li>preserve: The domain will remain in memory until it is destroyed
manually, it won't be running but allows for post-mortem debugging</li>
<li>rename-restart: a variant of the previous one but where the old domain
is renamed before being saved to allow a restart</li>
</ul><p>The following could be used for a Xen production system:</p><pre>&lt;domain&gt;
...
&lt;on_reboot&gt;restart&lt;/on_reboot&gt;
&lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
&lt;on_crash&gt;rename-restart&lt;/on_crash&gt;
...
&lt;/domain&gt;</pre><p>While the format may be extended in various ways as support for
morehypervisor types and features are added, it is expected that this core
subsetwill remain functional in spite of the evolution of the library.</p><h3 id="Fully"><a name="Fully1" id="Fully1">Fully virtualized
guests</a>(added in 0.1.3):</h3><p>Here is an example of a domain description used to start a
fullyvirtualized (a.k.a. HVM) Xen domain. This requires hardware
virtualizationsupport at the processor level but allows to run unmodified
operatingsystems:</p><pre>&lt;domain type='xen' id='3'&gt;
&lt;/domain&gt;</pre><p>While the format may be extended in various ways as support for more
hypervisor types and features are added, it is expected that this core subset
will remain functional in spite of the evolution of the library.</p><h3 id="Fully"><a name="Fully1" id="Fully1">Fully virtualized guests</a>
(added in 0.1.3):</h3><p>Here is an example of a domain description used to start a fully
virtualized (a.k.a. HVM) Xen domain. This requires hardware virtualization
support at the processor level but allows to run unmodified operating
systems:</p><pre>&lt;domain type='xen' id='3'&gt;
&lt;name&gt;fv0&lt;/name&gt;
&lt;uuid&gt;4dea22b31d52d8f32516782e98ab3fa0&lt;/uuid&gt;
&lt;os&gt;
@ -142,49 +139,49 @@ operatingsystems:</p><pre>&lt;domain type='xen' id='3'&gt;
&lt;/disk&gt;
<span style="color: #0000E5; background-color: #FFFFFF">&lt;graphics type='vnc' port='5904'/&gt;</span>
&lt;/devices&gt;
&lt;/domain&gt;</pre><p>There is a few things to notice specifically for HVM domains:</p><ul><li>the optional <code>&lt;features&gt;</code>block is used to
enablecertain guest CPU / system features. For HVM guests the
followingfeatures are defined:
<ul><li><code>pae</code>- enable PAE memory addressing</li>
<li><code>apic</code>- enable IO APIC</li>
<li><code>acpi</code>- enable ACPI bios</li>
&lt;/domain&gt;</pre><p>There is a few things to notice specifically for HVM domains:</p><ul><li>the optional <code>&lt;features&gt;</code> block is used to enable
certain guest CPU / system features. For HVM guests the following
features are defined:
<ul><li><code>pae</code> - enable PAE memory addressing</li>
<li><code>apic</code> - enable IO APIC</li>
<li><code>acpi</code> - enable ACPI bios</li>
</ul></li>
<li>the <code>&lt;os&gt;</code>block description is very different, firstit
indicates that the type is 'hvm' for hardware virtualization, theninstead
of a kernel, boot and command line arguments, it points to an osboot
loader which will extract the boot informations from the boot
devicespecified in a separate boot element. The <code>dev</code>attribute
onthe <code>boot</code>tag can be one of:
<ul><li><code>fd</code>- boot from first floppy device</li>
<li><code>hd</code>- boot from first harddisk device</li>
<li><code>cdrom</code>- boot from first cdrom device</li>
<li>the <code>&lt;os&gt;</code> block description is very different, first
it indicates that the type is 'hvm' for hardware virtualization, then
instead of a kernel, boot and command line arguments, it points to an os
boot loader which will extract the boot informations from the boot device
specified in a separate boot element. The <code>dev</code> attribute on
the <code>boot</code> tag can be one of:
<ul><li><code>fd</code> - boot from first floppy device</li>
<li><code>hd</code> - boot from first harddisk device</li>
<li><code>cdrom</code> - boot from first cdrom device</li>
</ul></li>
<li>the <code>&lt;devices&gt;</code>section includes an emulator
entrypointing to an additional program in charge of emulating the
devices</li>
<li>the disk entry indicates in the dev target section that the
emulationfor the drive is the first IDE disk device hda. The list of
device namessupported is dependant on the Hypervisor, but for Xen it can
be any IDEdevice <code>hda</code>-<code>hdd</code>, or a floppy
device<code>fda</code>, <code>fdb</code>. The
<code>&lt;disk&gt;</code>elementalso supports a 'device' attribute to
indicate what kinda of hardware toemulate. The following values are
supported:
<ul><li><code>floppy</code>- a floppy disk controller</li>
<li><code>disk</code>- a generic hard drive (the default itomitted)</li>
<li><code>cdrom</code>- a CDROM device</li>
<li>the <code>&lt;devices&gt;</code> section includes an emulator entry
pointing to an additional program in charge of emulating the devices</li>
<li>the disk entry indicates in the dev target section that the emulation
for the drive is the first IDE disk device hda. The list of device names
supported is dependant on the Hypervisor, but for Xen it can be any IDE
device <code>hda</code>-<code>hdd</code>, or a floppy device
<code>fda</code>, <code>fdb</code>. The <code>&lt;disk&gt;</code> element
also supports a 'device' attribute to indicate what kinda of hardware to
emulate. The following values are supported:
<ul><li><code>floppy</code> - a floppy disk controller</li>
<li><code>disk</code> - a generic hard drive (the default it
omitted)</li>
<li><code>cdrom</code> - a CDROM device</li>
</ul>
For Xen 3.0.2 and earlier a CDROM device can only be emulated on
the<code>hdc</code>channel, while for 3.0.3 and later, it can be
emulatedon any IDE channel.</li>
<li>the <code>&lt;devices&gt;</code>section also include at least oneentry
for the graphic device used to render the os. Currently there isjust 2
types possible 'vnc' or 'sdl'. If the type is 'vnc', then anadditional
<code>port</code>attribute will be present indicating the TCPport on
which the VNC server is accepting client connections.</li>
</ul><p>It is likely that the HVM description gets additional optional elementsand
attributes as the support for fully virtualized domain expands,especially for
the variety of devices emulated and the graphic supportoptions offered.</p><h3><a name="KVM1" id="KVM1">KVM domain (added in 0.2.0)</a></h3><p>Support for the <a href="http://kvm.qumranet.com/">KVM virtualization</a>
For Xen 3.0.2 and earlier a CDROM device can only be emulated on the
<code>hdc</code> channel, while for 3.0.3 and later, it can be emulated
on any IDE channel.</li>
<li>the <code>&lt;devices&gt;</code> section also include at least one
entry for the graphic device used to render the os. Currently there is
just 2 types possible 'vnc' or 'sdl'. If the type is 'vnc', then an
additional <code>port</code> attribute will be present indicating the TCP
port on which the VNC server is accepting client connections.</li>
</ul><p>It is likely that the HVM description gets additional optional elements
and attributes as the support for fully virtualized domain expands,
especially for the variety of devices emulated and the graphic support
options offered.</p><h3><a name="KVM1" id="KVM1">KVM domain (added in 0.2.0)</a></h3><p>Support for the <a href="http://kvm.qumranet.com/">KVM virtualization</a>
is provided in recent Linux kernels (2.6.20 and onward). This requires
specific hardware with acceleration support and the availability of the
special version of the <a href="http://fabrice.bellard.free.fr/qemu/">QEmu</a> binary. Since this
@ -415,4 +412,4 @@ Xen support, you will see the os_type of xen to indicate a paravirtual
kernel, then architecture informations and potential features.</p><p>The third block (in green) gives similar informations but when running a
32 bit OS fully virtualized with Xen using the hvm support.</p><p>This section is likely to be updated and augmented in the future, see <a href="https://www.redhat.com/archives/libvir-list/2007-March/msg00215.html">the
discussion</a> which led to the capabilities format in the mailing-list
archives.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
archives.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

21
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@ -15,15 +15,16 @@
</div>
<div id="content">
<h3>what is <span class="style1">libvirt?</span></h3>
<p>Libvirt is a C toolkit to interact with the virtualization capabilitiesof
recent versions of Linux (and other OSes). It is free software availableunder
the <a href="http://www.opensource.org/licenses/lgpl-license.html">GNULesser
General Public License</a>. Virtualization of the Linux OperatingSystem means
the ability to run multiple instances of Operating Systemsconcurently on a
single hardware system where the basic resources are drivenby a Linux
instance. The library aim at providing long term stable C APIinitially for
the <a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xenparavirtualization</a>but
should be able to integrate other virtualizationmechanisms if needed.</p>
<p>Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software available
under the <a href="http://www.opensource.org/licenses/lgpl-license.html">GNU
Lesser General Public License</a>. Virtualization of the Linux Operating
System means the ability to run multiple instances of Operating Systems
concurently on a single hardware system where the basic resources are driven
by a Linux instance. The library aim at providing long term stable C API
initially for the <a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen
paravirtualization</a> but should be able to integrate other
virtualization mechanisms, it currently also support <a href="http://fabrice.bellard.free.fr/qemu/">QEmu</a> and <a href="http://kvm.qumranet.com/">KVM</a>.</p>
</div>
</div>
<div class="linkList">
@ -46,7 +47,7 @@ should be able to integrate other virtualizationmechanisms if needed.</p>
<a href="downloads.html">Downloads</a>
</li>
<li>
<a href="format.html">XML Formats</a>
<a href="format.html">XML Format</a>
</li>
<li>
<a href="python.html">Binding for Python</a>

59
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@ -1,32 +1,31 @@
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Introduction</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Introduction</h1><p>Libvirt is a C toolkit to interact with the virtualization capabilities
ofrecent versions of Linux (and other OSes), but libvirt won't try to
provideall possible interfaces for interacting with the virtualization
features.</p><p>To avoid ambiguity about the terms used here here are the definitions
forsome of the specific concepts used in libvirt documentation:</p><ul><li>a <strong>node</strong>is a single physical machine</li>
<li>an <strong>hypervisor</strong>is a layer of software allowing
tovirtualize a node in a set of virtual machines with possibly
differentconfigurations than the node itself</li>
<li>a <strong>domain</strong>is an instance of an operating system
runningon a virtualized machine provided by the hypervisor</li>
</ul><p style="text-align: center"><img alt="Hypervisor and domains running on a node" src="node.gif" /></p><p>Now we can define the goal of libvirt: to provide the lowest
possiblegeneric and stable layer to manage domains on a node.</p><p>This implies the following:</p><ul><li>the API is not targetted to a single virtualization environment,
itcurrently supports Xen and QEmu/KVM. This also implies that some
veryspecific capabilities which are not generic enough may not be
provided aslibvirt APIs</li>
<li>the API should allow to do efficiently and cleanly all the
operationsneeded to manage domains on a node</li>
<li>the API will not try to provide hight level multi-nodes
managementfeatures like load balancing, though they could be implemented
on top oflibvirt</li>
<li>stability of the API is a big concern, libvirt should
isolateapplications from the frequent changes expected at the lower level
of thevirtualization framework</li>
</ul><p>So libvirt should be a building block for higher level management toolsand
for applications focusing on virtualization of a single node (the
onlyexception being domain migration between node capabilities which may need
tobe added at the libvirt level). Where possible libvirt should be
extendableto be able to provide the same API for remote nodes, however this
is not thecase at the moment, the code currently handle only local node
accesses(extension for remote access support is being worked on, see<a href="bugs.html">the mailing list</a>discussions about it).</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Introduction</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Introduction</h1><p>Libvirt is a C toolkit to interact with the virtualization capabilities of
recent versions of Linux (and other OSes), but libvirt won't try to provide
all possible interfaces for interacting with the virtualization features.</p><p>To avoid ambiguity about the terms used here here are the definitions for
some of the specific concepts used in libvirt documentation:</p><ul><li>a <strong>node</strong> is a single physical machine</li>
<li>an <strong>hypervisor</strong> is a layer of software allowing to
virtualize a node in a set of virtual machines with possibly different
configurations than the node itself</li>
<li>a <strong>domain</strong> is an instance of an operating system running
on a virtualized machine provided by the hypervisor</li>
</ul><p style="text-align: center"><img alt="Hypervisor and domains running on a node" src="node.gif" /></p><p>Now we can define the goal of libvirt: to provide the lowest possible
generic and stable layer to manage domains on a node.</p><p>This implies the following:</p><ul><li>the API should not be targetted to a single virtualization environment
though Xen is the current default, which also means that some very
specific capabilities which are not generic enough may not be provided as
libvirt APIs</li>
<li>the API should allow to do efficiently and cleanly all the operations
needed to manage domains on a node</li>
<li>the API will not try to provide hight level multi-nodes management
features like load balancing, though they could be implemented on top of
libvirt</li>
<li>stability of the API is a big concern, libvirt should isolate
applications from the frequent changes expected at the lower level of the
virtualization framework</li>
</ul><p>So libvirt should be a building block for higher level management tools
and for applications focusing on virtualization of a single node (the only
exception being domain migration between node capabilities which may need to
be added at the libvirt level). Where possible libvirt should be extendable
to be able to provide the same API for remote nodes, however this is not the
case at the moment, the code currently handle only local node accesses
(extension for remote access support is being worked on, see <a href="bugs.html">the mailing list</a> discussions about it).</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Releases</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Releases</h1><p>Here is the list of official releases, however since it is early on in
thedevelopment of libvirt, it is preferable when possible to just use the <a href="downloads.html">CVS version or snapshot</a>, contact the mailing
listand check the <a href="ChangeLog.html">ChangeLog</a>to gauge
progresses.</p><h3>0.2.1: Mar 16 2007</h3><ul><li>Various internal cleanups (Richard Jones,Daniel Berrange,Mark McLoughlin)</li>
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Releases</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Releases</h1><p>Here is the list of official releases, however since it is early on in the
development of libvirt, it is preferable when possible to just use the <a href="downloads.html">CVS version or snapshot</a>, contact the mailing list
and check the <a href="ChangeLog.html">ChangeLog</a> to gauge progresses.</p><h3>0.2.1: Mar 16 2007</h3><ul><li>Various internal cleanups (Richard Jones,Daniel Berrange,Mark McLoughlin)</li>
<li>Bug fixes: libvirt_qemud daemon path (Daniel Berrange), libvirt
config directory (Daniel Berrange and Mark McLoughlin), memory leak in qemud (Mark), various fixes on network support (Mark), avoid Xen domain zombies on device hotplug errors (Daniel Berrange), various fixes on qemud (Mark),
argsparsing (Richard Jones), virsh -t argument (Saori Fukuta), avoid virsh
crash on TAB key (Daniel Berrange), detect xend operation failures (Kazuki Mizushima), don't listen on null socket (Rich Jones), read-only socket cleanup (Rich Jones), use of vnc port 5900 (Nobuhiro Itou), assorted networking fixes
(Daniel Berrange), shutoff and shutdown mismatches (Kazuki Mizushima), unlimited memory handling (Atsushi SAKAI), python binding fixes (Tatsuro Enokura)</li>
<li>Build and portability fixes: IA64 fixes (Atsushi SAKAI), dependancies and build (Daniel Berrange), fix xend port detection (Daniel Berrange), icompile time warnings (Mark), avoid const related compiler warnings (Daniel Berrange), automated builds (Daniel Berrange), pointer/int mismatch (Richard Jones), configure time selection of drivers, libvirt spec hacking (Daniel Berrange)</li>
config directory (Daniel Berrange and Mark McLoughlin), memory leak
in qemud (Mark), various fixes on network support (Mark), avoid Xen
domain zombies on device hotplug errors (Daniel Berrange), various
fixes on qemud (Mark), args parsing (Richard Jones), virsh -t argument
(Saori Fukuta), avoid virsh crash on TAB key (Daniel Berrange), detect
xend operation failures (Kazuki Mizushima), don't listen on null socket
(Rich Jones), read-only socket cleanup (Rich Jones), use of vnc port 5900
(Nobuhiro Itou), assorted networking fixes (Daniel Berrange), shutoff and
shutdown mismatches (Kazuki Mizushima), unlimited memory handling
(Atsushi SAKAI), python binding fixes (Tatsuro Enokura)</li>
<li>Build and portability fixes: IA64 fixes (Atsushi SAKAI), dependancies
and build (Daniel Berrange), fix xend port detection (Daniel
Berrange), icompile time warnings (Mark), avoid const related
compiler warnings (Daniel Berrange), automated builds (Daniel
Berrange), pointer/int mismatch (Richard Jones), configure time
selection of drivers, libvirt spec hacking (Daniel Berrange)</li>
<li>Add support for network autostart and init scripts (Mark McLoughlin)</li>
<li>New API virConnectGetCapabilities() to detect the virtualization
capabilities of a host (Richard Jones)</li>
@ -21,28 +31,22 @@ progresses.</p><h3>0.2.1: Mar 16 2007</h3><ul><li>Various internal cleanups (Ric
number of virtual CPU (Masayuki Sunou), virtsh --readonly option (Rich
Jones), python bindings for new functions (Daniel Berrange)</li>
<li>Documentation updates especially on the XML formats</li>
</ul><h3>0.2.0: Feb 14 2007</h3><ul><li>Various internal cleanups (Mark McLoughlin, Richard Jones,Daniel
Berrange, Karel Zak)</li>
<li>Bug fixes: avoid a crash in connect (Daniel Berrange), virsh
argsparsing (Richard Jones)</li>
</ul><h3>0.2.0: Feb 14 2007</h3><ul><li>Various internal cleanups (Mark McLoughlin, Richard Jones,
Daniel Berrange, Karel Zak)</li>
<li>Bug fixes: avoid a crash in connect (Daniel Berrange), virsh args
parsing (Richard Jones)</li>
<li>Add support for QEmu and KVM virtualization (Daniel Berrange)</li>
<li>Add support for network configuration (Mark McLoughlin)</li>
<li>Minor improvements: regression testing (Daniel Berrange),localization
string updates</li>
<li>Minor improvements: regression testing (Daniel Berrange),
localization string updates</li>
</ul><h3>0.1.11: Jan 22 2007</h3><ul><li>Finish XML &lt;-&gt; XM config files support</li>
<li>Remove memory leak when freeing virConf objects</li>
<li>Finishing inactive domain support (Daniel Berrange)</li>
<li>Added a Relax-NG schemas to check XML instances</li>
</ul><h3>0.1.10: Dec 20 2006</h3><ul><li>more localizations</li>
<li>bug fixes: VCPU info breakages on xen 3.0.3, xenDaemonListDomains
buffer overflow (Daniel Berrange), reference count bug when creating Xen
domains (Daniel Berrange).</li>
<li>improvements: support graphic framebuffer for Xen paravirt (Daniel
Berrange), VNC listen IP range support (Daniel Berrange), support for
default Xen config files and inactive domains of 3.0.4 (Daniel
Berrange).</li>
</ul><h3>0.1.9: Nov 29 2006</h3><ul><li>python bindings: release interpeter lock when calling C (Daniel
Berrange)</li>
<li>bug fixes: VCPU info breakages on xen 3.0.3, xenDaemonListDomains buffer overflow (Daniel Berrange), reference count bug when creating Xen domains (Daniel Berrange).</li>
<li>improvements: support graphic framebuffer for Xen paravirt (Daniel Berrange), VNC listen IP range support (Daniel Berrange), support for default Xen config files and inactive domains of 3.0.4 (Daniel Berrange).</li>
</ul><h3>0.1.9: Nov 29 2006</h3><ul><li>python bindings: release interpeter lock when calling C (Daniel Berrange)</li>
<li>don't raise HTTP error when looking informations for a domain</li>
<li>some refactoring to use the driver for all entry points</li>
<li>better error reporting (Daniel Berrange)</li>
@ -50,134 +54,123 @@ progresses.</p><h3>0.2.1: Mar 16 2007</h3><ul><li>Various internal cleanups (Ric
<li>provide XML parsing errors</li>
<li>extension of the test framework (Daniel Berrange)</li>
<li>fix the reconnect regression test</li>
<li>python bindings: Domain instances now link to the Connect to avoid
garbage collection and disconnect</li>
<li>separate the notion of maximum memory and current use at the XML
level</li>
<li>python bindings: Domain instances now link to the Connect to avoid garbage collection and disconnect</li>
<li>separate the notion of maximum memory and current use at the XML level</li>
<li>Fix a memory leak (Daniel Berrange)</li>
<li>add support for shareable drives</li>
<li>add support for non-bridge style networking configs for guests(Daniel
Berrange)</li>
<li>add support for non-bridge style networking configs for guests(Daniel Berrange)</li>
<li>python bindings: fix unsigned long marshalling (Daniel Berrange)</li>
<li>new config APIs virConfNew() and virConfSetValue() to build configs
from scratch</li>
<li>new config APIs virConfNew() and virConfSetValue() to build configs from scratch</li>
<li>hot plug device support based on Michel Ponceau patch</li>
<li>added support for inactive domains, new APIs, various associated
cleanup (Daniel Berrange)</li>
<li>added support for inactive domains, new APIs, various associated cleanup (Daniel Berrange)</li>
<li>special device model for HVM guests (Daniel Berrange)</li>
<li>add API to dump core of domains (but requires a patched xend)</li>
<li>pygrub bootloader informations take over &lt;os&gt; informations</li>
<li>updated the localization strings</li>
</ul><h3>0.1.8: Oct 16 2006</h3><ul><li>Bug for system with page size != 4k</li>
<li>vcpu number initialization (Philippe Berthault)</li>
<li>don't label crashed domains as shut off (Peter Vetere)</li>
<li>fix virsh man page (Noriko Mizumoto)</li>
<li>blktapdd support for alternate drivers like blktap (Daniel
Berrange)</li>
<li>memory leak fixes (xend interface and XML parsing) (Daniel
Berrange)</li>
<li>compile fix</li>
<li>mlock/munlock size fixes (Daniel Berrange)</li>
<li>improve error reporting</li>
</ul><h3>0.1.7: Sep 29 2006</h3><ul><li>fix a memory bug on getting vcpu informations from xend (Daniel
Berrange)</li>
<li>fix another problem in the hypercalls change in Xen
changeset86d26e6ec89b when getting domain informations (Daniel
Berrange)</li>
</ul><h3>0.1.8: Oct 16 2006</h3><ul><li> Bug for system with page size != 4k</li>
<li> vcpu number initialization (Philippe Berthault)</li>
<li> don't label crashed domains as shut off (Peter Vetere)</li>
<li> fix virsh man page (Noriko Mizumoto)</li>
<li> blktapdd support for alternate drivers like blktap (Daniel Berrange)</li>
<li> memory leak fixes (xend interface and XML parsing) (Daniel Berrange)</li>
<li> compile fix</li>
<li> mlock/munlock size fixes (Daniel Berrange)</li>
<li> improve error reporting</li>
</ul><h3>0.1.7: Sep 29 2006</h3><ul><li> fix a memory bug on getting vcpu informations from xend (Daniel Berrange)</li>
<li> fix another problem in the hypercalls change in Xen changeset
86d26e6ec89b when getting domain informations (Daniel Berrange)</li>
</ul><h3>0.1.6: Sep 22 2006</h3><ul><li>Support for localization of strings using gettext (Daniel Berrange)</li>
<li>Support for new Xen-3.0.3 cdrom and disk configuration (Daniel
Berrange)</li>
<li>Support for setting VNC port when creating domains with newxend config
files (Daniel Berrange)</li>
<li>Support for new Xen-3.0.3 cdrom and disk configuration (Daniel Berrange)</li>
<li>Support for setting VNC port when creating domains with new
xend config files (Daniel Berrange) </li>
<li>Fix bug when running against xen-3.0.2 hypercalls (Jim Fehlig)</li>
<li>Fix reconnection problem when talking directly to http xend</li>
</ul><h3>0.1.5: Sep 5 2006</h3><ul><li>Support for new hypercalls change in Xen changeset 86d26e6ec89b</li>
<li>bug fixes: virParseUUID() was wrong, netwoking for paravirt
guestsi(Daniel Berrange), virsh on non-existent domains (Daniel
Berrange),string cast bug when handling error in python (Pete Vetere),
HTTP500 xend error code handling (Pete Vetere and Daniel Berrange)</li>
<li>improvements: test suite for SEXPR &lt;-&gt; XML format conversions
(DanielBerrange), virsh output regression suite (Daniel Berrange), new
environvariable VIRSH_DEFAULT_CONNECT_URI for the default URI when
connecting(Daniel Berrange), graphical console support for paravirt
guests(Jeremy Katz), parsing of simple Xen config files (with Daniel
Berrange),early work on defined (not running) domains (Daniel
Berrange),virsh output improvement (Daniel Berrange</li>
</ul><h3>0.1.4: Aug 16 2006</h3><ul><li>bug fixes: spec file fix (Mark McLoughlin), error report problem
(withHugh Brock), long integer in Python bindings (with Daniel Berrange),
XMLgeneration bug for CDRom (Daniel Berrange), bug whem using number()
XPathfunction (Mark McLoughlin), fix python detection code, remove
duplicateinitialization errors (Daniel Berrange)</li>
<li>improvements: UUID in XML description (Peter Vetere), proxy
codecleanup, virtual CPU and affinity support + virsh support
(MichelPonceau, Philippe Berthault, Daniel Berrange), port and tty
informationsfor console in XML (Daniel Berrange), added XML dump to
driver and proxysupport (Daniel Berrange), extention of boot options with
support forfloppy and cdrom (Daniel Berrange), features block in XML to
report/askPAE, ACPI, APIC for HVM domains (Daniel Berrange), fail
saide-effectoperations when using read-only connection, large
improvements to testdriver (Daniel Berrange)</li>
<li>bug fixes: virParseUUID() was wrong, netwoking for paravirt guestsi
(Daniel Berrange), virsh on non-existent domains (Daniel Berrange),
string cast bug when handling error in python (Pete Vetere), HTTP
500 xend error code handling (Pete Vetere and Daniel Berrange)</li>
<li>improvements: test suite for SEXPR &lt;-&gt; XML format conversions (Daniel
Berrange), virsh output regression suite (Daniel Berrange), new environ
variable VIRSH_DEFAULT_CONNECT_URI for the default URI when connecting
(Daniel Berrange), graphical console support for paravirt guests
(Jeremy Katz), parsing of simple Xen config files (with Daniel Berrange),
early work on defined (not running) domains (Daniel Berrange),
virsh output improvement (Daniel Berrange</li>
</ul><h3>0.1.4: Aug 16 2006</h3><ul><li>bug fixes: spec file fix (Mark McLoughlin), error report problem (with
Hugh Brock), long integer in Python bindings (with Daniel Berrange), XML
generation bug for CDRom (Daniel Berrange), bug whem using number() XPath
function (Mark McLoughlin), fix python detection code, remove duplicate
initialization errors (Daniel Berrange)</li>
<li>improvements: UUID in XML description (Peter Vetere), proxy code
cleanup, virtual CPU and affinity support + virsh support (Michel
Ponceau, Philippe Berthault, Daniel Berrange), port and tty informations
for console in XML (Daniel Berrange), added XML dump to driver and proxy
support (Daniel Berrange), extention of boot options with support for
floppy and cdrom (Daniel Berrange), features block in XML to report/ask
PAE, ACPI, APIC for HVM domains (Daniel Berrange), fail saide-effect
operations when using read-only connection, large improvements to test
driver (Daniel Berrange) </li>
<li>documentation: spelling (Daniel Berrange), test driver examples.</li>
</ul><h3>0.1.3: Jul 11 2006</h3><ul><li>bugfixes: build as non-root, fix xend access when root, handling
ofempty XML elements (Mark McLoughlin), XML serialization and parsing
fixes(Mark McLoughlin), allow to create domains without disk
(MarkMcLoughlin),</li>
<li>improvement: xenDaemonLookupByID from O(n^2) to O(n) (Daniel
Berrange),support for fully virtualized guest (Jim Fehlig, DV, Mark
McLoughlin)</li>
</ul><h3>0.1.3: Jul 11 2006</h3><ul><li>bugfixes: build as non-root, fix xend access when root, handling of
empty XML elements (Mark McLoughlin), XML serialization and parsing fixes
(Mark McLoughlin), allow to create domains without disk (Mark
McLoughlin),</li>
<li>improvement: xenDaemonLookupByID from O(n^2) to O(n) (Daniel Berrange),
support for fully virtualized guest (Jim Fehlig, DV, Mark McLoughlin)</li>
<li>documentation: augmented to cover hvm domains</li>
</ul><h3>0.1.2: Jul 3 2006</h3><ul><li>headers include paths fixup</li>
<li>proxy mechanism for unpriviledged read-only access by httpu</li>
</ul><h3>0.1.1: Jun 21 2006</h3><ul><li>building fixes: ncurses fallback (Jim Fehlig), VPATH builds (Daniel
P.Berrange)</li>
<li>driver cleanups: new entry points, cleanup of libvirt.c (with Daniel
P.Berrange)</li>
</ul><h3>0.1.1: Jun 21 2006</h3><ul><li>building fixes: ncurses fallback (Jim Fehlig), VPATH builds (Daniel P.
Berrange)</li>
<li>driver cleanups: new entry points, cleanup of libvirt.c (with Daniel P.
Berrange)</li>
<li>Cope with API change introduced in Xen changeset 10277</li>
<li>new test driver for regression checks (Daniel P. Berrange)</li>
<li>improvements: added UUID to XML serialization, buffer usage (KarelZak),
--connect argument to virsh (Daniel P. Berrange),</li>
<li>bug fixes: uninitialized memory access in error reporting,
S-Exprparsing (Jim Fehlig, Jeremy Katz), virConnectOpen bug, remove a
TODO inxs_internal.c</li>
<li>documentation: Python examples (David Lutterkort), new Perl bindingURL,
man page update (Karel Zak)</li>
</ul><h3>0.1.0: Apr 10 2006</h3><ul><li>building fixes: --with-xen-distdir option (Ronald Aigner), out of
treebuild and pkginfo cflag fix (Daniel Berrange)</li>
<li>enhancement and fixes of the XML description format (David
Lutterkortand Jim Fehlig)</li>
<li>improvements: added UUID to XML serialization, buffer usage (Karel
Zak), --connect argument to virsh (Daniel P. Berrange),</li>
<li>bug fixes: uninitialized memory access in error reporting, S-Expr
parsing (Jim Fehlig, Jeremy Katz), virConnectOpen bug, remove a TODO in
xs_internal.c</li>
<li>documentation: Python examples (David Lutterkort), new Perl binding
URL, man page update (Karel Zak)</li>
</ul><h3>0.1.0: Apr 10 2006</h3><ul><li>building fixes: --with-xen-distdir option (Ronald Aigner), out of tree
build and pkginfo cflag fix (Daniel Berrange)</li>
<li>enhancement and fixes of the XML description format (David Lutterkort
and Jim Fehlig)</li>
<li>new APIs: for Node information and Reboot</li>
<li>internal code cleanup: refactoring internals into a driver model,
moreerror handling, structure sharing, thread safety and ref counting</li>
<li>bug fixes: error message (Jim Meyering), error allocation in virsh
(JimMeyering), virDomainLookupByID (Jim Fehlig),</li>
<li>documentation: updates on architecture, and format, typo fix
(JimMeyering)</li>
<li>bindings: exception handling in examples (Jim Meyering), perl ones
outof tree (Daniel Berrange)</li>
<li>virsh: more options, create, nodeinfo (Karel Zak), renaming of
someoptions (Karel Zak), use stderr only for errors (Karel Zak), man
page(Andrew Puch)</li>
<li>internal code cleanup: refactoring internals into a driver model, more
error handling, structure sharing, thread safety and ref counting</li>
<li>bug fixes: error message (Jim Meyering), error allocation in virsh (Jim
Meyering), virDomainLookupByID (Jim Fehlig),</li>
<li>documentation: updates on architecture, and format, typo fix (Jim
Meyering)</li>
<li>bindings: exception handling in examples (Jim Meyering), perl ones out
of tree (Daniel Berrange)</li>
<li>virsh: more options, create, nodeinfo (Karel Zak), renaming of some
options (Karel Zak), use stderr only for errors (Karel Zak), man page
(Andrew Puch)</li>
</ul><h3>0.0.6: Feb 28 2006</h3><ul><li>add UUID lookup and extract API</li>
<li>add error handling APIs both synchronous and asynchronous</li>
<li>added minimal hook for error handling at the python level, improved
thepython bindings</li>
<li>added minimal hook for error handling at the python level, improved the
python bindings</li>
<li>augment the documentation and tests to cover error handling</li>
</ul><h3>0.0.5: Feb 23 2006</h3><ul><li>Added XML description parsing, dependance to libxml2, implemented
thecreation API virDomainCreateLinux()</li>
</ul><h3>0.0.5: Feb 23 2006</h3><ul><li>Added XML description parsing, dependance to libxml2, implemented the
creation API virDomainCreateLinux()</li>
<li>new APIs to lookup and name domain by UUID</li>
<li>fixed the XML dump when using the Xend access</li>
<li>Fixed a few more problem related to the name change</li>
<li>Adding regression tests in python and examples in C</li>
<li>web site improvement, extended the documentation to cover the XMLformat
and Python API</li>
<li>web site improvement, extended the documentation to cover the XML
format and Python API</li>
<li>Added devhelp help for Gnome/Gtk programmers</li>
</ul><h3>0.0.4: Feb 10 2006</h3><ul><li>Fix various bugs introduced in the name change</li>
</ul><h3>0.0.3: Feb 9 2006</h3><ul><li>Switch name from from 'libvir' to libvirt</li>
<li>Starting infrastructure to add code examples</li>
<li>Update of python bindings for completeness</li>
</ul><h3>0.0.2: Jan 29 2006</h3><ul><li>Update of the documentation, web site redesign (Diana Fong)</li>
<li>integration of HTTP xend RPC based on libxend by Anthony Liquori
formost operations</li>
<li>integration of HTTP xend RPC based on libxend by Anthony Liquori for
most operations</li>
<li>Adding Save and Restore APIs</li>
<li>extended the virsh command line tool (Karel Zak)</li>
<li>remove xenstore transactions (Anthony Liguori)</li>
@ -185,4 +178,4 @@ progresses.</p><h3>0.2.1: Mar 16 2007</h3><ul><li>Various internal cleanups (Ric
</ul><h3>0.0.1: Dec 19 2005</h3><ul><li>First release</li>
<li>Basic management of existing Xen domains</li>
<li>Minimal autogenerated Python bindings</li>
</ul></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
</ul></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>

59
docs/python.html
View File

@ -1,33 +1,32 @@
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Binding for Python</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Binding for Python</h1><p>Libvirt comes with direct support for the Python language (just make
sureyou installed the libvirt-python package if not compiling from sources).
Alsonote that Daniel Berrange provides <a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">bindings for
Perl</a>too.</p><p>The Python binding should be complete and are mostly
automaticallygenerated from the formal description of the API in xml. The
bindings arearticulated around 2 classes <code>virConnect</code>and virDomain
mapping tothe C types. Functions in the C API taking either type as argument
thenbecomes methods for the classes, their name is just stripped from
thevirConnect or virDomain(Get) prefix and the first letter gets converted
tolower case, for example the C functions:</p><p><code>int <a href="html/libvirt-libvirt.html#virConnectNumOfDomains">virConnectNumOfDomains</a>(virConnectPtr
conn);</code></p><p><code>int <a href="html/libvirt-libvirt.html#virDomainSetMaxMemory">virDomainSetMaxMemory</a>(virDomainPtr
domain, unsigned long memory);</code></p><p>become</p><p><code>virConn::numOfDomains(self)</code></p><p><code>virDomain::setMaxMemory(self, memory)</code></p><p>This process is fully automated, you can get a summary of the conversionin
the file libvirtclass.txt present in the python dir or in the docs.Thereis a
couple of function who don't map directly to their C counterparts due
tospecificities in their argument conversions:</p><ul><li><code><a href="html/libvirt-libvirt.html#virConnectListDomains">virConnectListDomains</a></code>is
replaced by <code>virDomain::listDomainsID(self)</code>which returnsa
list of the integer ID for the currently running domains</li>
<li><code><a href="html/libvirt-libvirt.html#virDomainGetInfo">virDomainGetInfo</a></code>is
replaced by <code>virDomain::info()</code>which returns a list of
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvirt.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Binding for Python</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Binding for Python</h1><p>Libvirt comes with direct support for the Python language (just make sure
you installed the libvirt-python package if not compiling from sources). Also
note that Daniel Berrange provides <a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">bindings for Perl</a>
too.</p><p>The Python binding should be complete and are mostly automatically
generated from the formal description of the API in xml. The bindings are
articulated around 2 classes <code>virConnect</code> and virDomain mapping to
the C types. Functions in the C API taking either type as argument then
becomes methods for the classes, their name is just stripped from the
virConnect or virDomain(Get) prefix and the first letter gets converted to
lower case, for example the C functions:</p><p><code>int <a href="html/libvirt-libvirt.html#virConnectNumOfDomains">virConnectNumOfDomains</a>
(virConnectPtr conn);</code></p><p><code>int <a href="html/libvirt-libvirt.html#virDomainSetMaxMemory">virDomainSetMaxMemory</a>
(virDomainPtr domain, unsigned long memory);</code></p><p>become</p><p><code>virConn::numOfDomains(self)</code></p><p><code>virDomain::setMaxMemory(self, memory)</code></p><p>This process is fully automated, you can get a summary of the conversion
in the file libvirtclass.txt present in the python dir or in the docs.There
is a couple of function who don't map directly to their C counterparts due to
specificities in their argument conversions:</p><ul><li><code><a href="html/libvirt-libvirt.html#virConnectListDomains">virConnectListDomains</a></code>
is replaced by <code>virDomain::listDomainsID(self)</code> which returns
a list of the integer ID for the currently running domains</li>
<li><code><a href="html/libvirt-libvirt.html#virDomainGetInfo">virDomainGetInfo</a></code>
is replaced by <code>virDomain::info()</code> which returns a list of
<ol><li>state: one of the state values (virDomainState)</li>
<li>maxMemory: the maximum memory used by the domain</li>
<li>memory: the current amount of memory used by the domain</li>
<li>nbVirtCPU: the number of virtual CPU</li>
<li>cpuTime: the time used by the domain in nanoseconds</li>
</ol></li>
</ul><p>So let's look at a simple example inspired from the
<code>basic.py</code>test found in <code>python/tests/</code>in the source
tree:</p><pre>import <span style="color: #0071FF; background-color: #FFFFFF">libvirt</span>
</ul><p>So let's look at a simple example inspired from the <code>basic.py</code>
test found in <code>python/tests/</code> in the source tree:</p><pre>import <span style="color: #0071FF; background-color: #FFFFFF">libvirt</span>
import sys
conn = <span style="color: #0071FF; background-color: #FFFFFF">libvirt</span>.openReadOnly(None)
@ -42,13 +41,13 @@ except:
sys.exit(1)
print "Domain 0: id %d running %s" % (dom0.<span style="color: #FF0080; background-color: #FFFFFF">ID</span>(), dom0.<span style="color: #FF0080; background-color: #FFFFFF">OSType</span>())
print dom0.<span style="color: #FF0080; background-color: #FFFFFF">info</span>()</pre><p>There is not much to comment about it, it really is a straight mappingfrom
the C API, the only points to notice are:</p><ul><li>the import of the module called <code><span style="color: #0071FF; background-color: #FFFFFF">libvirt</span></code></li>
<li>getting a connection to the hypervisor, in that case using
theopenReadOnly function allows the code to execute as a normal user.</li>
print dom0.<span style="color: #FF0080; background-color: #FFFFFF">info</span>()</pre><p>There is not much to comment about it, it really is a straight mapping
from the C API, the only points to notice are:</p><ul><li>the import of the module called <code><span style="color: #0071FF; background-color: #FFFFFF">libvirt</span></code></li>
<li>getting a connection to the hypervisor, in that case using the
openReadOnly function allows the code to execute as a normal user.</li>
<li>getting an object representing the Domain 0 using <span style="color: #007F00; background-color: #FFFFFF">lookupByName</span></li>
<li>if the domain is not found a libvirtError exception will be raised</li>
<li>extracting and printing some informations about the domain usingvarious
<span style="color: #E50073; background-color: #FFFFFF">methods</span>associated
to the virDomain class.</li>
</ul></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Formats</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
<li>extracting and printing some informations about the domain using
various <span style="color: #E50073; background-color: #FFFFFF">methods</span>
associated to the virDomain class.</li>
</ul></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvirt architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="format.html">XML Format</a></li><li><a href="python.html">Binding for Python</a></li><li><a href="errors.html">Handling of errors</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="html/index.html">API Menu</a></li><li><a href="examples/index.html">C code examples</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="https://bugzilla.redhat.com/bugzilla/buglist.cgi?product=Fedora+Core&amp;component=libvirt&amp;bug_status=NEW&amp;bug_status=ASSIGNED&amp;bug_status=REOPENED&amp;bug_status=MODIFIED&amp;short_desc_type=allwordssubstr&amp;short_desc=&amp;long_desc_type=allwordssubstr">Open bugs</a></li><li><a href="http://virt-manager.et.redhat.com/">virt-manager</a></li><li><a href="http://search.cpan.org/~danberr/Sys-Virt-0.1.0/">Perl bindings</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>