On Wed, Apr 7, 2021 at 9:46 PM Strahil Nikolov <hunter86...@yahoo.com> wrote:
> I always though that the setup is the same, just the node count is only > one. > > I guess you need pcs, corosync + pacemaker. > If RH is going to support it, they will require fencing. Most probably sbd > or ipmi are the best candidates. > I don't think we do require fencing for single-node clusters. (Anyone at Red Hat, feel free to comment.) I vaguely recall an internal mailing list or IRC conversation where we discussed this months ago, but I can't find it now. I've also checked our support policies documentation, and it's not mentioned in the "cluster size" doc or the "fencing" doc. The closest thing I can find is the following, from the cluster size doc[1]: ~~~ RHEL 8.2 and later: Support for 1 or more nodes - Single node clusters do not support DLM and GFS2 filesystems (as they require fencing). ~~~ To me that suggests that fencing isn't required in a single-node cluster. Maybe sbd could work (I haven't thought it through), but conventional power fencing (e.g., fence_ipmilan) wouldn't. That's because most conventional power fencing agents require sending a "power on" signal after the "power off" is complete. [1] https://access.redhat.com/articles/3069031 > Best Regards, > Strahil Nikolov > > On Thu, Apr 8, 2021 at 6:52, d tbsky > <tbs...@gmail.com> wrote: > Hi: > I found RHEL 8.2 support single node cluster now. but I didn't > find further document to explain the concept. RHEL 8.2 also support > "disaster recovery cluster". so I think maybe a single node disaster > recovery cluster is not bad. > > I think corosync is still necessary under single node cluster. or > is there other new style of configuration? > > thanks for help! > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ > > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ > -- Regards, Reid Wahl, RHCA Senior Software Maintenance Engineer, Red Hat CEE - Platform Support Delivery - ClusterHA
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