Running handler scripts on "EventMemberJoin"

[Ben Booth]

Hi.

Is is possible to run handler scripts on "EventMemberJoin" and "EventMemberLeave"?

This was possible with Serf, but I can't find any documentation for Consul.

Thanks,

Ben

[Armon Dadgar]

Ben,

Serf had a much more node-centric view of things like Consul has a more service-centric view.

You can use watches to monitor nodes if you want, but it doesn’t work quite the same way.

The nodes are only reaped after leaving or failing for 72 hours, so they don’t trigger at the same

rate.

Instead, you can use the watch for a specific service. The service watch can be filtered on

“passingonly”, so that you only get the live/healthy members. This way the Join/Leave is

much more immediate. The big difference is the service vs node granularity however.

Another option is to watch the “checks” and specifically the “serfHealth” for nodes joining,

leaving and failing.

Hope that helps!

http://www.consul.io/docs/agent/watches.html

Best Regards,

Armon Dadgar

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[Ben Booth]

Thanks for the reply.

I'll try to rethink my strategy then. :)

Loving Consul btw

Ben