<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Nov 15, 2021 at 10:37 AM S Rogers <<a href="mailto:sa.rogers1342@gmail.com">sa.rogers1342@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I had thought about doing that, but the cluster is then dependent on the <br>
external system, and if that external system was to go down or become <br>
unreachable for any reason then it would falsely cause the cluster to <br>
failover or worse it could even take the cluster down completely, if the <br>
external system goes down and both nodes cannot ping it.<br></blockquote><div>You wouldn't necessarily have to ban resources from nodes that can't</div><div>reach the external network. It would be enough to make them prefer</div><div>the location that has connection. So if both lose connection  one side</div><div>would still stay up.</div><div>Not to depend on something really external you might use the</div><div>router to your external network as ping target.</div><div>In case of fencing - triggered by whatever - and a potential fence-race</div><div>you might use the rather new feature priority-fencing-delay (give the node</div><div>that is running valuable resources a benefit in the race) or go for </div><div>fence_heuristics_ping (pseudo fence-resource that together with a</div><div>fencing-topology prevents the node without access to a certain IP</div><div>from fencing the other node).</div><div><a href="https://clusterlabs.org/pacemaker/doc/deprecated/en-US/Pacemaker/2.0/html/Pacemaker_Explained/s-cluster-options.html">https://clusterlabs.org/pacemaker/doc/deprecated/en-US/Pacemaker/2.0/html/Pacemaker_Explained/s-cluster-options.html</a><br></div><div><a href="https://github.com/ClusterLabs/fence-agents/blob/master/agents/heuristics_ping/fence_heuristics_ping.py">https://github.com/ClusterLabs/fence-agents/blob/master/agents/heuristics_ping/fence_heuristics_ping.py</a><br></div><div><br></div><div>Klaus</div><div>_______________________________________________</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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