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libvirt attempts to determine at startup time which networks are already active, and set their active flags. Previously it has done this by assuming that all networks are inactive, then setting the active flag if the network has a bridge device associated with it and that bridge device exists. This is not useful for macvtap and hostdev based networks, since they do not use a bridge device. Of course the reason that such a check had to be done was that the presence of a status file in the network "stateDir" couldn't be trusted as an indicator of whether or not a network was active. This was due to the network driver mistakenly using /var/lib/libvirt/network to store the status files, rather than /var/run/libvirt/network (similar to what is done by every other libvirt driver that stores status xml for its objects). The difference is that /var/run is cleared out when the host reboots, so you can be assured that the state file you are seeing isn't just left over from a previous boot of the host. Now that the network driver has been switched to using /var/run/libvirt/network for status, we can also modify it to assume that any network with an existing status file is by definition active - we do this when reading the status file. To fine tune the results, networkFindActiveConfigs() is changed to networkUpdateAllState(), and only sets active = 0 if the conditions for particular network types are *not* met. The result is that during the first run of libvirtd after the host boots, there are no status files, so no networks are active. Any time libvirtd is restarted, any network with a status file will be marked as active (unless the network uses a bridge device and that device for some reason doesn't exist).
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>