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.
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@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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