[ClusterLabs] can't create master/slave resource

[Tomas Jelinek]

Dne 20.9.2017 v 09:03 Tomas Jelinek napsal(a):
> Hi,
> 
> systemd resources cannot be used as master/slave resources. In order to 
> use a resource as a master/slave, the resource must support promote and 
> demote actions [1], which systemd resources don't.
> 
> # pcs resource create test systemd:postfix
> # pcs resource master test
> # pcs cluster verify -V
>     error: native_unpack:        Resource test:0 is of type systemd and 
> therefore cannot be used as a master/slave resource
>     error: create_child_clone:   Failed unpacking resource test
>     error: unpack_resources:     Failed unpacking master test-master
> Errors found during check: config not valid
> 
> You need to use an ocf resource agent (with promote and demote actions 
> implemented) for your resource for this to work.
> 
> Because the resource cannot be unpacked by pacemaker, it is not shown in 
> the "pcs status" output - pcs doesn't get any info about it from 
> pacemaker. This issue has been already discussed. Pacemaker will provide 
> info when such errors occur so pcs will be able to display it. [2]
> 
> The resource may not be running but it is still defined in the 
> configuration:
> # pcs resource --full
>   Master: test-master
>    Resource: test (class=systemd type=postfix)
>     Operations: monitor interval=60 timeout=100 (test-monitor-interval-60)
>                 start interval=0s timeout=100 (test-start-interval-0s)
>                 stop interval=0s timeout=100 (test-stop-interval-0s)
> 
> That's why you get an error that the id already exists.
> 
> 
> I'm going to file a bug against pcs so it won't be possible to 
> master/slave systemd resources as it is not supported anyway.

https://bugzilla.redhat.com/show_bug.cgi?id=1493416

> 
> Regards,
> Tomas
> 
> [1]: 
> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html#_requirements_for_multi_state_resource_agents 
> 
> [2]: https://bugzilla.redhat.com/show_bug.cgi?id=1447951
> 
> 
> Dne 19.9.2017 v 17:13 Tiemen Ruiten napsal(a):
>> Hello,
>>
>> We have a 3-node cluster (CentOS 7.4) with several systemd resources 
>> configured. One of them I would like to create as a master/slave 
>> resource, so following the RedHat documentation:
>>
>> pcs resource create ivr systemd:japp at ivr - works, the service is 
>> started on one of the nodes.
>> pcs resource master ivr-master ivr - doesn't work as expected: the 
>> service is stopped and the output of pcs resource show doesn't list it 
>> anymore. However, if I try the command again, I get an error saying 
>> the resource ivr already exists! I have to delete the resource and 
>> recreate it to get the service to run.
>>
>> pacemaker-libs-1.1.16-12.el7_4.2.x86_64
>> pacemaker-cluster-libs-1.1.16-12.el7_4.2.x86_64
>> pacemaker-1.1.16-12.el7_4.2.x86_64
>> pacemaker-cli-1.1.16-12.el7_4.2.x86_64
>> corosynclib-2.4.0-9.el7_4.2.x86_64
>> corosync-2.4.0-9.el7_4.2.x86_64
>>
>> Am I doing something wrong?
>>
>> -- 
>> Tiemen Ruiten
>> Systems Engineer
>> R&D Media
>>
>>
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