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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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65fb9d49cc
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Reinier Schoof 65fb9d49cc fixed xt_physdev warning when defining ip(6)tables rules 
When starting a VM, /var/log/messages was spammed with the following message:
 xt_physdev: using --physdev-out in the OUTPUT, FORWARD and POSTROUTING chains for non-bridged traffic is not supported anymore.

With each extra VM I start, the messages get amplified
exponentially. This results in longer starting times every new VM,
relative the the previously started VM. When I ran a test with
starting 100 equal VM's, the first VM started in about 2 seconds, the
100th VM took 48 seconds to start. I'm running a vanilla 3.7.1 kernel,
but I have the same issue on VM hosts with kernel 3.2.28 or 3.2.0,
running libvirt 0.9.12 and 0.9.8 respectively.

Looking into the warning, it seemed that iptables need an extra argument,
--physdev-is-bridged, in commands like:
 iptables -A libvirt-out -m physdev --physdev-is-bridged --physdev-out vnet99 -g FP-vnet99

With that, the warnings in /var/log/messages are gone and running the
test again proved the 100th VM started in 3.8 seconds.
2013-01-17 11:32:26 -07:00
.gnulib@61c7b1e32e build: fix build with optimization enabled 2013-01-03 10:12:47 -07:00
build-aux Document bracket whitespace rules & add syntax-check rule 2012-11-02 14:00:32 +00:00
daemon call virstateCleanup to do the cleanup before libvirtd exits 2013-01-16 17:18:59 -07:00
docs Introduce an LXC specific public API & library 2013-01-14 13:58:34 +00:00
examples examples: Fix balloon event callback 2012-12-11 13:25:50 +01:00
gnulib maint: update to latest gnulib 2013-01-02 09:38:30 -07:00
include Move comments after enum members 2013-01-17 12:35:31 +01:00
m4 Fix typo LIBCURL_{CFLAGS,LIBS} to CURL_{CFLAGS,LIBS} 2013-01-14 17:22:31 +00:00
po Add a port allocator class 2013-01-16 11:02:58 +00:00
python python: Avoid freeing uninitialized new_params pointer 2013-01-17 12:05:12 +01:00
src fixed xt_physdev warning when defining ip(6)tables rules 2013-01-17 11:32:26 -07:00
tests Avoid integer wrap on remotePortMax in QEMU driver 2013-01-17 13:52:33 +00:00
tools virsh-volume.c: Switch to C99 initialization of vshCmdOptDef 2013-01-17 13:58:53 +01:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore Add a port allocator class 2013-01-16 11:02:58 +00:00
.gitmodules
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add Claudio Bley to the committers list 2013-01-08 16:34:30 +01:00
autobuild.sh Switch automated builds to use Mingw64 toolchain instead of Mingw32 2012-06-25 10:41:10 +01:00
autogen.sh build: fix incremental autogen.sh when no AUTHORS is present 2012-12-03 14:59:09 -07:00
bootstrap maint: update to latest gnulib 2013-01-02 09:38:30 -07:00
bootstrap.conf build: use autobuild module to make build logs nicer 2013-01-02 16:43:58 -07:00
cfg.mk Introduce an LXC specific public API & library 2013-01-14 13:58:34 +00:00
ChangeLog-old virterror.c: Fix several spelling mistakes 2012-02-03 11:32:51 -07:00
configure.ac build: further fixes for broken if_bridge.h 2013-01-14 21:08:23 -07:00
COPYING.LIB remove all trailing blank lines 2009-07-16 15:06:42 +02:00
HACKING Add a test suite for validating SELinux labelling 2013-01-14 13:40:04 +00:00
libvirt.pc.in build: silence warning from autoconf 2012-05-30 09:22:02 -06:00
libvirt.spec.in Introduce an LXC specific public API & library 2013-01-14 13:58:34 +00:00
Makefile.am build: Fix AUTHORS generation 2012-12-17 21:17:55 +01:00
Makefile.nonreentrant Ban use of all inet_* functions 2010-10-22 11:59:23 +01:00
mingw-libvirt.spec.in Introduce an LXC specific public API & library 2013-01-14 13:58:34 +00:00
README
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in Add a virtlockd client as a lock driver impl 2012-12-13 15:26:57 +00:00
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>