[ovirt-users] Regarding fencing support in ovirt

[Nir Soffer]

On Wed, Dec 14, 2016 at 9:02 AM, TranceWorldLogic .
<tranceworldlogic at gmail.com> wrote:
> Hi,
>
> I was trying to explore more about fencing option supported in ovirt.
> But getting lost in documents.
>
> My requirement is to fence at VM level rather than host level.
> e.g let assume VM1.1, VM1.2,VM1.3 are running on host1 and VM2.1,VM2.2 VM2.3
> running on host2. Suppose due to some error only VM1.1 goes down [Note:
> VM1.2 and VM1.3 in running state] then VM2.1 must come up.
>
> Can I get to know whether such functionality is supported by ovirt ?
> If yes, would you please explain also how it work
>           or would you share refernece for me to refer and understand it ?
> if yes, is it configurable by python sdk ?

Fencing in the VM level is not available yet, but will be possible
once we have vm-leases:
https://www.ovirt.org/develop/release-management/features/storage/vm-leases/

On top of this, we will support automatic failover of vms:
https://github.com/oVirt/ovirt-site/pull/586/commits/77669161397ebf4cc15c66e0e6876bc033384cfc

This should be available in 4.1, currently blocked by libvirt bug:
https://bugzilla.redhat.com/1403691

Once a vm has a lease, you can revoke the lease from another host, causing
sanlock on the original host to terminate the vm using sanlock_request() api.

When this will be implemented, we can expose this via the REST API and the SDK.

Nir

>
> Thanks,
> ~Rohit
>
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