[CentOS] How to prevent virtual machines running twice on the disk images?
Paul Heinlein
heinlein at madboa.com
Fri May 11 16:06:37 UTC 2012
On Fri, 11 May 2012, Theo Band wrote:
> I use KVM on two identical centos5 hosts. [....]
>
> My question is, how can I prevent host A from starting a "shut off"
> VM that actually has been migrated to host B? The VM could actually
> be running on any another host. It could also have been crashed. The
> most simple solution would be some sort of lock file placed next to
> the disk image location, so seen by all hosts. But perhaps there is
> another way of working with virt-manager that I am not aware of?
My way of dealing with that is to undefine the domain on host A after
it's been moved to host B, e.g.,
virsh migrate --live myvm remote://host-b
virsh undefine myvm
The CentOS 6 version of virsh allows those operations to be combined:
virsh migrate --live --persistent --undefinesource myvm ...
--
Paul Heinlein
heinlein at madboa.com
45°38' N, 122°6' W
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