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Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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Laine Stump 1cb1f9dabf network: always create dnsmasq hosts and addnhosts files, even if empty 
This fixes the problem reported in:

  https://bugzilla.redhat.com/show_bug.cgi?id=868389

Previously, the dnsmasq hosts file (used for static dhcp entries, and
addnhosts file (used for additional dns host entries) were only
created/referenced on the dnsmasq commandline if there was something
to put in them at the time the network was started. Once we can update
a network definition while it's active (which is now possible with
virNetworkUpdate), this is no longer a valid strategy - if there were
0 dhcp static hosts (resulting in no reference to the hosts file on the
commandline), then one was later added, the commandline wouldn't have
linked dnsmasq up to the file, so even though we create it, dnsmasq
doesn't pay any attention.

The solution is to just always create these files and reference them
on the dnsmasq commandline (almost always, anyway). That way dnsmasq
can notice when a new entry is added at runtime (a SIGHUP is sent to
dnsmasq by virNetworkUdpate whenever a host entry is added or removed)

The exception to this is that the dhcp static hosts file isn't created
if there are no lease ranges *and* no static hosts. This is because in
this case dnsmasq won't be setup to listen for dhcp requests anyway -
in that case, if the count of dhcp hosts goes from 0 to 1, dnsmasq
will need to be restarted anyway (to get it listening on the dhcp
port). Likewise, if the dhcp hosts count goes from 1 to 0 (and there
are no dhcp ranges) we need to restart dnsmasq so that it will stop
listening on port 67. These special situations are handled in the
bridge driver's networkUpdate() by checking for ((bool)
nranges||nhosts) both before and after the update, and triggering a
dnsmasq restart if the before and after don't match.
2012-10-20 21:29:19 -04:00
.gnulib@2a9edc6f2b build: update gnulib for FreeBSD build 2012-10-03 11:50:02 -06:00
build-aux maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
daemon Add JSON serialization of virNetServerClientPtr objects for process re-exec() 2012-10-16 15:45:55 +01:00
docs storage: match RNG to supported driver types 2012-10-19 17:35:09 -06:00
examples tests: Fix domain-events python test 2012-10-16 16:37:29 +02:00
gnulib build: fix fresh checkout on RHEL5 2012-04-19 17:11:43 -06:00
include Introduce an internal API for handling file based lockspaces 2012-10-16 15:45:55 +01:00
m4 build: avoid -Wno-format on new-enough gcc 2012-10-02 09:48:23 -06:00
po Implement CPU model driver for PowerPC 2012-10-17 10:03:34 +02:00
python Add support for SUSPEND_DISK event 2012-10-15 12:09:10 +02:00
src network: always create dnsmasq hosts and addnhosts files, even if empty 2012-10-20 21:29:19 -04:00
tests network: always create dnsmasq hosts and addnhosts files, even if empty 2012-10-20 21:29:19 -04:00
tools node_memory: Add new parameter field to tune the new sysfs knob 2012-10-15 17:35:54 +08:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
autobuild.sh Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
autogen.sh build: avoid infinite autogen loop 2012-10-01 09:47:38 -06:00
bootstrap maint: regenerate bootstrap 2012-07-27 09:34:04 -06:00
bootstrap.conf Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
cfg.mk Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac locking: Fix build with sanlock < 2.4 2012-10-16 21:32:05 +02:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Various typos and misspellings 2012-10-12 00:03:43 +02:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in spec: Fix dependency for lock-sanlock subpackage 2012-10-18 14:23:24 +02:00
Makefile.am Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw-libvirt.spec.in parallels: add driver skeleton 2012-08-01 11:44:26 +08:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in syntax-check: fix run.in 2012-09-18 13:59:53 +02:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         LibVirt : simple API for virtualization

  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 GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently 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 Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>