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A core use case of the hook scripts is to be able to do things to a guest's network configuration. It is possible to hook into the 'start' operation for a QEMU guest which runs just before the guest is started. The TAP devices will exist at this point, but the QEMU process will not. It can be desirable to have a 'started' hook too, which runs once QEMU has started. If libvirtd is restarted it will re-populate firewall rules, but there is no QEMU hook to trigger for existing domains. This is solved with a 'reconnect' hook. Finally, if attaching to an external QEMU process there needs to be an 'attach' hook script. This all also applies to the LXC driver * docs/hooks.html.in: Document new operations * src/util/hooks.c, src/util/hooks.c: Add 'started', 'reconnect' and 'attach' operations for QEMU. Add 'prepare', 'started', 'release' and 'reconnect' operations for LXC * src/lxc/lxc_driver.c: Add hooks for 'prepare', 'started', 'release' and 'reconnect' operations * src/qemu/qemu_process.c: Add hooks for 'started', 'reconnect' and 'reconnect' operations
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>