Change hostnames MC/SG cluster

[Jimmy Aulestia_2]

I have a cluster with two nodes, can i change the nodes' hostname without affect the cluster?

[Jeff_Traigle]

Yes. High level steps:

1. Make sure all packages are running on nodeA
2. Remove nodeB from cluster
3. Rename nodeB
4. Add nodeB to cluster as new hostname
5. Move all packages to nodeB
6. Remove nodeA from cluster
7. Rename nodeA
8. Add nodeA to cluster as new hostname

[Steven E. Protter]

Shalom,

Make sure the new names are supported in /etc/hosts or the cluster may not function.

SEP

[Jaime Bolanos Rojas.]

Jimmy, most likely you already know, but remember to use a hostname with 8 characters the most.

Also a thread that you might says a couple of important things:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=764318&admit=-682735245+1153330372462+28353475

Regards,

Jaime.

[Jimmy Aulestia_2]

what are the commands in 2) y 4)?

I dont't find a command for remove or add a node in an runnig cluster.

Thanks

[Jeff_Traigle]

To remove and add nodes to a cluster, you need to edit cmclconfig.ascii (or whatever your cluster config file is named) and the package config files that reference the hostname. Then you have to run cmapplyconf. Specific steps should be outlined in the Managing Serviceguard manual, which you can get at the following URL:

http://docs.hp.com/en/ha.html#Serviceguard

[Jeff_Traigle]

And, if you're using a version that uses /etc/cmcluster/cmclnodelist, you'll need to change the hostnames in there on both nodes just prior to running the cmapplyconf command.