[ClusterLabs] shutdown of 2-Node cluster when power outage

[Lentes, Bernd]

----- Am 21. Apr 2019 um 6:51 schrieb Andrei Borzenkov arvidjaar at gmail.com:

> 20.04.2019 22:29, Lentes, Bernd пишет:
>> 
>> 
>> ----- Am 18. Apr 2019 um 16:21 schrieb kgaillot kgaillot at redhat.com:
>> 
>>>
>>> Simply stopping pacemaker and corosync by whatever mechanism your
>>> distribution uses (e.g. systemctl) should be sufficient.
>> 
>> That works. But strangely is that after a reboot both nodes are
>> shown as UNCLEAN. Does the cluster not remeber that it has been shutdown cleanly
>> ?
> 
> No. Pacemaker does not care what state cluster was during last shutdown.
> What matters is what state cluster is now.

Aah.
 
>> Problem is that after starting pacemaker and corosync on one node the other
>> is fenced because of that. (pacemaker and corosync aren't started automatically
>> by systemd).
>> 
> 
> That is correct and expected behavior. If node still did not appear
> after timeout, pacemaker assumes node is faulted and attempts to proceed
> with remaining nodes (after all, it is about _availability_ and waiting
> indefinitely means resources won't be available). For this it needs to
> ascertain state of missing node, so pacemaker attempts to stonith it.
> Otherwise each node could attempt to start resources resulting in split
> brain and data corruption.
> 
> Either start pacemaker on all nodes at the same time (with reasonable
> fuzz, doing "systemctl start pacemaker" in several terminal windows
> sequentially should be enough) or set wait_for_all option in corosync
> configuration. Note that with if you have two node cluster, two_node
> corosync option also implies wait_for_all.


Hi,

but what is if one node has e.g. a hardware failure and i have to wait for the spare part ?
With wait_for_all it can't start the resources.

Bernd
 

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