topic Re: Cluster hostname change in Operating System - HP-UX

Cluster hostname change

Cristina Reyes_1 — Wed, 05 Nov 2003 05:25:16 GMT

Hello,
I would like to know if someone knows what is the procedure to change the hostname of the nodes in a cluster environment in the VPO database.

The problem I have is that the nodes are in the database with the short name and should be with the long name resolved by DNS, so the VPO applications doesnÂ´t work, and when I open the browser the messages doesnÂ´t appear unless I change the name of the nodes to itÂ´s long name.

If someone can tell me what is the procedure to change the hostname in both nodes , I would be very gratefull.

Thanks for your help
Cr

Re: Cluster hostname change

Hrvoje Dubravica — Thu, 06 Nov 2003 06:33:37 GMT

how to change node names in cluster.

First you have to get current configuration
of cluster and each package in it.

cmgetconf -v cmcl.ascii
cmgetconf -v -p package_name package_name.ascii

Change names in each ascii file and
.rhosts if you use it or cmclnodelist

Shutdown both nodes in single user mode
and use
/sbin/set_parms hostname

to set new host name on each

Start both nodes without starting cluster
Then
cmcheckconf -v -C cmcl.ascii -p package_name.ascii ...

If it pass repeat same syntax but instead
of check use apply

Then cmruncl -v

Kind regards,

Hrvoje

Re: Cluster hostname change

Ralph Grothe — Thu, 06 Nov 2003 06:49:12 GMT

>Shutdown both nodes in single user mode
>and use
>/sbin/set_parms hostname

I would think you can avoid the shutdown.

Simply execute

hostname

uname -S

To make it permanent edit /etc/rc.config.d/netconf and redefine the variable HOSTNAME in there.
Then execute
/sbin/init.d/hostname start

Re: Cluster hostname change

Ashwani Kashyap — Tue, 11 Nov 2003 11:34:36 GMT

Wouldn't it be much more easier to make an alias to the new name from the existing name , both in the hosts file and the DNS database .

Re: Cluster hostname change

Kent Ostby — Tue, 11 Nov 2003 11:50:08 GMT

The following document was written by HP's ServiceGuard team for a step by step process to do this:

TITLE: Changing HOSTNAME on a ServiceGuard node
Edited to comply with ITRC Guidelines
Document ID:
UMCSGKBRC00006541

Re: Cluster hostname change

Christian Schulze — Fri, 05 Dec 2003 04:53:19 GMT

Hi Kent,
where can I find this document ??

TIA

Christian

Re: Cluster hostname change

G. Vrijhoeven — Fri, 05 Dec 2003 05:51:58 GMT

Hi Kent,

First check software on nodename based licensing if so aquire new licences.

Here is a solution.

Check for all the package config files with contain the "old node name. Adjust those files so the packages are not able to start up on that node, check and apply those. Mark these files.

Use set parms initial to alter the node name.

Add the new name to the clusterascii file and check and apply the configuration.

Alter the packages config files you marked to put in the new node name and check and apply those.

Hope this helps,

Gideon

Re: Cluster hostname change

Stephen Doud — Fri, 05 Dec 2003 09:51:55 GMT

Cristina - this sounds more like a VPO problem (VPO database) then a Serviceguard problem.

Consider going to the VPO forum?

-StephenDoud

Re: Cluster hostname change

Sanjay_6 — Fri, 05 Dec 2003 10:05:54 GMT

Hi,

You'll have to reapply the cluster binaries once the hostnames have changed. You can delete the cluster configuration and change the hostname, re-edit the cluster configuration file with the new hostnames and reapply the configuration.

I'm not sure about the VPO database, but the long / short names of the cluste nodes should not affect the app in any manner.

Hope this helps.

Regds

Re: Cluster hostname change

Julio Yamawaki — Sat, 06 Dec 2003 13:08:21 GMT

Cristina,

instead of changing your hostname, consider putting an alias with the short name on DNS.

Re: Cluster hostname change

Cristina_5 — Tue, 09 Dec 2003 02:52:45 GMT

Thanks all for your help!.
As Stephen says it seems more a VPO problem , so I contacted HP support.
The final solution I believe is to change the hostname of the VPO server in VPO database but I want to know how it affects the cluster.
Cristina