How is group membership determined in a Wildfly cluster of standalone servers?

polyzois Jun 9, 2015 3:48 AM

(I posted this on Stackoverflow yesterday maybe the wrong place )

I have seen that a cluster can be formed/started very easily with Wildfly. Is it possible using "standalone" configuration to create multiple clusters? That is some servers should only be part of a cluster named "cluster1" and other servers should form a different cluster named "cluster2". That is can a group name or similar be provided or configured? (I am not looking for a managed domain setup).

1. Re: How is group membership determined in a Wildfly cluster of standalone servers?

polyzois Jun 9, 2015 5:19 AM (in response to polyzois)

When thinking a bit more on this maybe nothing is needed other than different port offsets?
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2. Re: How is group membership determined in a Wildfly cluster of standalone servers?

pferraro Jun 9, 2015 3:42 PM (in response to polyzois)

Yes, you can create multiple clusters using the standalone configuration by specifying distinct multicast address/port. The port-offset does not apply to the multicast port, only the normal socket-binding port (typically you would want each server in a group to use distinct service ports, but the same multicast address/port).
By default, WF uses "ee" as the cluster name. You can change this to any name you wish. This is configured via the jgroups subsystem.
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3. Re: How is group membership determined in a Wildfly cluster of standalone servers?

polyzois Jun 11, 2015 5:22 AM (in response to pferraro)

Out of curiosity, which element defines the cluster name in jgroups (I looked in jgroups-as-jgroups_2_0.xsd and did not see any obvious candidate)
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