<div dir="auto"><div>Thanks for responding Andrei.</div><div dir="auto"><br></div><div dir="auto">How would i enable monitors on inactive nodes? I thought monitors runs on all nodes that the resource is on. Would you be able to provide a configuration sample that i can refer to? <br>Or will it be possible to configure the cluster to perform a probe in a given interval? Will appreciate some guidance on this. Thanks</div><div dir="auto"><br></div><div dir="auto"><br><div class="gmail_quote" dir="auto"><div dir="ltr">On Mon., Oct. 29, 2018, 13:20 Andrei Borzenkov, <<a href="mailto:arvidjaar@gmail.com" target="_blank" rel="noreferrer">arvidjaar@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">29.10.2018 20:04, <a href="mailto:jm2109384@gmail.com" rel="noreferrer noreferrer" target="_blank">jm2109384@gmail.com</a> пишет:<br>
> Hi Guys,<br>
> <br>
> I'm a new user of pacemaker clustering software and I've just configured a<br>
> cluster with a single systemd resource. I have the following cluster and<br>
> resource configurations below. Failover works perfectly between the two<br>
> nodes however, i wanted to have a constraint/rule or a config that will<br>
> ensure that my resource has a single instance running on the cluster at all<br>
> times. I'd like to avoid the situation where the resource gets started<br>
> manually and ends up running on both cluster nodes. Hoping to get your<br>
> advice on how to achieve this. Thanks in advance.<br>
<br>
pacemaker does one time probe on each node when pacemaker is started.<br>
This covers the case when resource was manually started before<br>
pacemaker. You can enable monitor on inactive nodes which should also<br>
detect if resource was started outside of pacemaker. But note that it<br>
leaves you some window (up to monitoring interval) when multiple<br>
instances may be up on different nodes until pacemaker is aware of it.<br>
<br>
> <br>
> ----<br>
> Cluster Name: cluster1<br>
> Corosync Nodes:<br>
> node1 node2<br>
> Pacemaker Nodes:<br>
> node1 node2<br>
> <br>
> Resources:<br>
> Resource: app1_service (class=systemd type=app1-server)<br>
> Operations: monitor interval=10s (app1_service-monitor-interval-10s)<br>
> start interval=0s timeout=120s<br>
> (app1_service-start-interval-0s)<br>
> stop interval=0s timeout=120s (app1_service-stop-interval-0s)<br>
> failure interval=0s timeout=120s<br>
> (app1_service-failure-interval-0s)<br>
> <br>
> Stonith Devices:<br>
> Fencing Levels:<br>
> <br>
> Location Constraints:<br>
> Ordering Constraints:<br>
> Colocation Constraints:<br>
> Ticket Constraints:<br>
> <br>
> Alerts:<br>
> No alerts defined<br>
> <br>
> Resources Defaults:<br>
> resource-stickiness: 100<br>
> migration-threshold: 1<br>
> failure-timeout: 120s<br>
> Operations Defaults:<br>
> No defaults set<br>
> <br>
> Cluster Properties:<br>
> cluster-infrastructure: corosync<br>
> dc-version: 1.1.18-11.el7_5.3-2b07d5c5a9<br>
> have-watchdog: false<br>
> last-lrm-refresh: 1540829641<br>
> no-quorum-policy: ignore<br>
> stonith-enabled: false<br>
> symmetric-cluster: true<br>
> <br>
> Quorum:<br>
> Options:<br>
> <br>
> <br>
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</blockquote></div></div></div>