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By default, all dnsmasq processes share the same leases file. libvirt also uses the --dhcp-lease-max option to control the maximum number of leases allowed. The problem is that libvirt puts in a number equal to the number of addresses in the range for the one network handled by a single instance of dnsmasq, but dnsmasq checks the total number of leases in the file (which could potentially contain many more). The solution is to tell each instance of dnsmasq to create and use its own leases file. (/var/lib/libvirt/network/<net-name>.leases). This file is created by dnsmasq when it starts, but not deleted when it exists. This is fine when the network is just being stopped, but if the leases file was left around when a network was undefined, we could end up with an ever-increasing number of dead files - instead, we explicitly unlink the leases file when a network is undefined. Note that Ubuntu carries a patch against an older version of libvirt for this: hhttps://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/713071 ttp://bazaar.launchpad.net/~serge-hallyn/ubuntu/maverick/libvirt/bugall/revision/109 I was certain I'd also seen discussion of this on libvir-list or libvirt-users, but couldn't find it.
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>