[Linux-cluster] Migrate VMs between two clusters

[Digimer]

On 04/23/2013 06:11 AM, Ralf Aumueller wrote:
> Hello,
>
> we have two 2-node clusters running on CentOS 6.4. Only service managed by
> clusters are KVM virtual machines. Both clusters have access to an NFS-server on
> which the config and storage files of the VMs reside.
> Now I want to move a VM from cluster1 to cluster2 with the following approach:
>
> On cluster1:
>   Edit cluster.conf and remove vm1 config
>   cman_tool version -r
>   virsh migrate --live vm1 qemu+ssh://HOST1_CL2/system tcp:HOST1_CL2
>
> (After live migration finished)
>
> On cluster2:
>   Edit cluster.conf and add vm1 config
>   cman_tool version -r
>   clusvcadm -e vm:vm1
>    (I have autostart="0" so I need to enable the VM. Cluster-SW finds running vm1
> and clustat is OK).
>
> I tried it and it worked -- but is it save? Any comments (expect to ask why we
> have two 2-node clusters :-) ) ?
>
> Best regard,
> Ralf

Did you try;

clusvcadm -M vm:foo -m target.node

That is how I live-migrate VMs. No need to remove it from the cluster 
and then re-add it.

-- 
Digimer
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