[ClusterLabs] All clones are stopped when one of them fails

[Reid Wahl]

Can you provide the state4.xml file that you're using? I'm unable to
reproduce this issue by the clone instance to fail on one node.

Might need some logs as well.

On Mon, Dec 7, 2020 at 10:40 PM Pavel Levshin <lpk at 581.spb.su> wrote:
>
> Hello.
>
>
> Despite many years of Pacemaker use, it never stops fooling me...
>
>
> This time, I have faced a trivial problem. In my new setup, the cluster consists of several identical nodes. A clone resource (vg.sanlock) is started on every node, ensuring it has access to SAN storage. Almost all other resources are colocated and ordered after vg.sanlock.
>
>
> This day, I've started a node, and vg.sanlock has failed to start. Then the cluster has desided to stop all the clone instances "due to node availability", taking down all other resources by dependencies. This seemes illogical to me. In the case of a failing clone, I would prefer to see it stopping on one node only. How do I do it properly?
>
>
> I've tried this config with Pacemaker 2.0.3 and 1.1.16, the behaviour stays the same.
>
>
> Reduced test config here:
>
>
> pcs cluster auth test-pcmk0 test-pcmk1 <>/dev/tty
>
> pcs cluster setup --name test-pcmk test-pcmk0 test-pcmk1 --transport udpu \
>
>   --auto_tie_breaker 1
>
> pcs cluster start --all --wait=60
>
> pcs cluster cib tmp-cib.xml
>
> cp tmp-cib.xml tmp-cib.xml.deltasrc
>
> pcs -f tmp-cib.xml property set stonith-enabled=false
>
> pcs -f tmp-cib.xml resource defaults resource-stickiness=100
>
> pcs -f tmp-cib.xml resource create vg.sanlock ocf:pacemaker:Dummy \
>
>   op monitor interval=10 timeout=20 start interval=0s stop interval=0s \
>
>   timeout=20
>
> pcs -f tmp-cib.xml resource clone vg.sanlock interleave=true
>
> pcs cluster cib-push tmp-cib.xml diff-against=tmp-cib.xml.deltasrc
>
>
>
> And here goes cluster reaction to the failure:
>
>
> # crm_simulate -x state4.xml -S
>
>
>
> Current cluster status:
>
> Online: [ test-pcmk0 test-pcmk1 ]
>
>
>
> Clone Set: vg.sanlock-clone [vg.sanlock]
>
>      vg.sanlock      (ocf::pacemaker:Dummy): FAILED test-pcmk0
>
>      Started: [ test-pcmk1 ]
>
>
>
> Transition Summary:
>
> * Stop       vg.sanlock:0     ( test-pcmk1 )   due to node availability
>
> * Stop       vg.sanlock:1     ( test-pcmk0 )   due to node availability
>
>
>
> Executing cluster transition:
>
> * Pseudo action:   vg.sanlock-clone_stop_0
>
> * Resource action: vg.sanlock   stop on test-pcmk1
>
> * Resource action: vg.sanlock   stop on test-pcmk0
>
> * Pseudo action:   vg.sanlock-clone_stopped_0
>
> * Pseudo action:   all_stopped
>
>
>
> Revised cluster status:
>
> Online: [ test-pcmk0 test-pcmk1 ]
>
>
>
> Clone Set: vg.sanlock-clone [vg.sanlock]
>
>      Stopped: [ test-pcmk0 test-pcmk1 ]
>
>
> As a sidenote, if I make those clones globally-unique, they seem to behave properly. But nowhere I found a reference to this solution. In general, globally-unique clones are referred to only where resource agents make distinction between clone instances. This is not the case.
>
>
> --
>
> Thanks,
>
> Pavel
>
>
>
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-- 
Regards,

Reid Wahl, RHCA
Senior Software Maintenance Engineer, Red Hat
CEE - Platform Support Delivery - ClusterHA