[Bug 577264] [NEW] libvirt failed to start vm: internal error Unable to find cgroup for

[edison]

Public bug reported:

I enabled cgroup for libvirt by:
Create a new virt group, by adding 
group virt {
        cpu {
                cpu.shares = 9216;
        }
}
into /etc/cgconfig.conf. And add "root:/usr/sbin/libvirtd cpu     virt/" into /etc/cgrules.conf
So, when I start libvirt-bin, libvirtd will create its own cgroup directory under /mnt/cgroup/cpu/virt/

Everything works well, except after reboot the machine.
I found libvirt doesn't create its own cgroup under /mnt/cgroup/cpu, or /mnt/cgroup/sysdefault, instead of /mnt/cgroup/cpu/virt
After some tests, the root cause is libvirtd is started earlier than cgred.
On lucid, libvirt-bin is started by upstart, while cgred is started by sys-V init script. How can I specify the dependency between the two? Apparently, libvirt-bin should be started after cgred.
Right now, I add the following hack in /etc/init/libvirt-bin.conf:
pre-start script
        mkdir -p /var/run/libvirt
        # Clean up a pidfile that might be left around
        rm -f /var/run/libvirtd.pid
        while [ 1 ]
        do
            if [ -f /var/run/cgred.pid ]
            then
                break
            else
                sleep 1
            fi
        done
end script
Then libvirt works with cgroup again.

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

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libvirt failed to start vm: internal error Unable to find cgroup for
https://bugs.launchpad.net/bugs/577264
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