On 10/10/2015 10:53 AM, Spencer Baugh wrote: > > Dear libvirt-users, > > Suppose my home directory is network mounted on to several different > machines. And suppose I defined some VMs in qemu:///session. The > configuration files and disk images for qemu:///session are stored in my > home directory. > > Now suppose I log in to some machine and use virsh. The qemu:///session > VMs that are marked autostart are started. Now if I log into another > machine and use virsh, it will presumably try to start my autostart VMs > again, since the same configuration is present in both homedirs. > > Is there anything libvirt does that might prevent it from starting the > same VM multiple times on different machines? Or might allow > machine-specific autostart configuration? Maybe something could be done > with /etc/machine-id! > > In terms of qemu:///system, this is like having /var/lib/libvirt/images/ > live on a network-mounted filesystem (fairly normal I assume) and also > having /etc/libvirt/qemu live on a network-mounted filesystem (not as > normal). Not sure how you would deal with the issue there either but I > can see why you might want to have your same VM configuration available > on all hosts, so it would be cool to figure out that problem as > well. > > The answer may be the VM configuration is host-specific, so sharing VM > configuration between hosts is not a good idea. In that case, any other > recommendations on how to deal with the networked homedir case? > The proper way to make sure shared VMs aren't started across multiple machines is libvirt's locking support: https://libvirt.org/locking.html It requires running a separate daemon though so isn't trivial, and I have no idea if it can be made to work with qemu:///session. It's an interesting problem though, but not one that I can see libvirt adding explicit autostart+machine-id support to handle since it's pretty niche. Maybe you can disable autostart at the libvirt level, and add a custom ~/bin/virsh wrapper to do the manually autostart VMs only for the machine-id you care about, or something similarly crazy - Cole _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
