Currently I manually poweroff each KVM guest before rebooting the host. However, this is getting old and now I am up to about 20 guest machines.

Can I trust Ubuntu Server 12.04 to do the Right Thing and hold off on completing a shutdown until the last KVM client is off?

Alternatively is there an easier way to shut all the guests off gracefully?

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    Something to think about: a shutdown script that would send some sort of "shutdown all VMs" signal to KVM. The idea needs some fleshing out, but if KVM supports command-line control, it wouldn't be too hard to create a simple shutdown script to do that. – JamesTheAwesomeDude Mar 16 '13 at 5:16
  • Yes - this could be done via the virsh command, I'm looking for something more out-of-the-box. According to this launchpad bug, it may already Just Work: bugs.launchpad.net/ubuntu/+source/kvm/+bug/350936 – HDave Mar 25 '13 at 5:38
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    On RedHat they have a script called libvirt-guests which takes care of this automatically, but for whatever reason, Ubuntu doesn't include this script in their package. launchpad.net/ubuntu/+source/libvirt/0.9.8-2ubuntu1 – HDave Mar 25 '13 at 5:47
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    ok - looking /etc/init/libvirt-bin it appears that the necessary code is in there to do this. I just completed a test run and it did work, but I needed to increase the timeout that was in that file from 30 seconds to 2 minutes. – HDave Mar 25 '13 at 6:17
  • As a system admin I'm shocked to see the timeout in /etc/init/libvirt-bin.conf is ONLY 30 seconds. Checking the code I see this isn't even per VM, it is total. I've seen a physical (non-VM) production server that take 15min to shutdown on new fast hardware after a fresh install and databases restored. My Work's current main VM server takes nearly 10mins to shutdown due to the 30VMs with multiple databases etc. – BeowulfNode42 Feb 4 '14 at 7:54

Yes, this is done automatically, according to this fixed bug: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/350936

See also: https://serverfault.com/questions/200751/can-kvm-suspend-or-shutdown-guests-automatically-on-host-shutdown

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    Ubuntu 19.04 does not actually do this. – James Hancock Oct 19 '19 at 11:36

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