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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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b044210ed2
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Daniel P. Berrange b044210ed2 Fix race condition reconnecting to vms & loading configs 
The following sequence

 1. Define a persistent QMEU guest
 2. Start the QEMU guest
 3. Stop libvirtd
 4. Kill the QEMU process
 5. Start libvirtd
 6. List persistent guests

At the last step, the previously running persistent guest
will be missing. This is because of a race condition in the
QEMU driver startup code. It does

 1. Load all VM state files
 2. Spawn thread to reconnect to each VM
 3. Load all VM config files

Only at the end of step 3, does the 'virDomainObjPtr' get
marked as "persistent". There is therefore a window where
the thread reconnecting to the VM will remove the persistent
VM from the list.

The easy fix is to simply switch the order of steps 2 & 3.

In addition to this though, we must only attempt to reconnect
to a VM which had a non-zero PID loaded from its state file.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit f26701f565)
2013-11-06 11:45:03 -05:00
.gnulib@4a5ee89c8a maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
build-aux Add API for calling systemd-machined's DBus API 2013-07-22 13:09:58 +01:00
daemon Remove all direct use of getenv 2013-10-29 16:13:03 +00:00
docs LXC: Fix handling of RAM filesystem size units 2013-10-15 12:58:52 +02:00
examples Don't link virt-login-shell against libvirt.so (CVE-2013-4400) 2013-10-21 14:19:05 +01:00
gnulib Don't link virt-login-shell against libvirt.so (CVE-2013-4400) 2013-10-21 14:19:05 +01:00
include libvirt: add new public API virConnectGetCPUModelNames 2013-09-23 15:41:50 -06:00
m4 maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
po Release of libvirt-1.1.3 2013-10-01 15:04:14 +08:00
python python: Fix Create*WithFiles filefd passing 2013-10-23 09:03:09 +01:00
src Fix race condition reconnecting to vms & loading configs 2013-11-06 11:45:03 -05:00
tests Remove (nearly) all use of getuid()/getgid() 2013-10-29 16:19:00 +00:00
tools Remove all direct use of getenv 2013-10-29 16:13:03 +00:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore Fix flaw in detecting log format 2013-10-29 16:10:22 +00:00
.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 Add John Ferlan to the committers list 2013-02-05 10:59:32 -05:00
autobuild.sh build: make autobuild require rpm build deps 2013-09-16 09:35:05 -06:00
autogen.sh autogen.sh: Correctly detect .git as a file 2013-08-29 13:19:45 +02:00
bootstrap maint: update to latest gnulib 2013-09-24 06:53:07 -06:00
bootstrap.conf Add helpers for getting env vars in a setuid environment 2013-10-21 14:18:47 +01:00
cfg.mk Block all use of getenv with syntax-check 2013-10-29 16:14:00 +00:00
ChangeLog-old docs, comments: minor typo fixes 2013-09-10 17:06:41 -06:00
config-post.h build: fix build of virt-login-shell on systems with older gnutls 2013-10-23 09:02:38 +01:00
configure.ac Don't link virt-login-shell against libvirt.so (CVE-2013-4400) 2013-10-21 14:19:05 +01:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
HACKING docs: mention VIR_TEST_RANGE 2013-08-12 20:44:41 -06:00
libvirt.pc.in Add missing 'libvirt_lxc_api' variable in pkg-config file 2013-09-04 14:52:40 +01:00
libvirt.spec.in Move virt-login-shell into libvirt-login-shell sub-RPM 2013-10-23 10:32:04 +01:00
Makefile.am Don't link virt-login-shell against libvirt.so (CVE-2013-4400) 2013-10-21 14:19:05 +01:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
mingw-libvirt.spec.in build: add configure option to disable gnulib tests 2013-08-12 10:02:38 -06:00
README
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in run: license as LGPL 2013-02-23 14:03:19 -07:00
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>