[ClusterLabs] Live migration not working on shutdown

[Klaus Wenninger]

On 11/02/2016 06:32 PM, Ken Gaillot wrote:
> On 10/26/2016 06:12 AM, Rainer Nerb wrote:
>> Hello all,
>>
>> we're currently testing a 2-node-cluster with 2 vms and live migration
>> on CentOS 7.2 and Pacemaker 1.1.13-10 with disks on iSCSI-targets and
>> migration via ssh-method.
>>
>> Live migration works, if we issue "pcs resource move ...", "pcs cluster
>> standby", "pcs cluster stop" and even "systemctl rescue".
>> The latter only worked, after adding the following additional
>> dependencies to pacemaker.service and leaving the management of those
>> services to systemd:
>>
>>   * After/Requires=systemd-machined.service
>>   * After/Requires=systemd-machine-id-commit.service
>>   * After/Requires=remote-fs.target
>>   * After/Requires=libvirtd.service
>>   * After/Requires=iscsi.service
>>   * After/Requires=iscsid.service
>>   * After/Requires=sshd.service
> This makes sense when clustered resources depend on services that aren't
> themselves managed by the cluster. It's dependent on your situation, so
> it's not something that pacemaker can solve generically.
>
> You may already be aware, but the easiest way to add such requirements
> is to put them in a systemd unit override, e.g.
> /etc/systemd/system/pacemaker.service.d/dependencies.conf.
>
>> When shutting down or rebooting migration fails and not even the regular
>> shutdown of the vms succeeds. Systemd seems to tear down the vms by
>> terminating something they depend on.
>>
>> Is this a known issue? Did we miss any further dependencies?
> There was a shutdown issue when using systemd-class cluster resources
> (systemd: instead of ocf:), but I believe that was fixed in the package
> you're using, and it's probably not relevant here anyway.
Speaking of
https://github.com/ClusterLabs/pacemaker/pull/887/commits/6aae8542abedc755b90c8c49aa5c429718fd12f1?

It shouldn't be in Centos 7.2 but I agree unless there are no
systemd-resources involved it wouldn't matter.

>
> It does sound like there's another dependency, but I don't know what.
>
> What log messages do you see on the failure?
>
>> Tia
>> Rainer
>>
>>
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