Hi,
Follow the steps:
steps to change hostname of nodes in serviceguard cluster environment:
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In order to change the hostname,number of system and cluster files must be edited, the server must be rebooted, and the cluster configuration
file must be re-applied.Use the following steps to complete the changeover.
1. If the present cluster configuration does not match the present
hardware configuration, further cluster modifications may compound
unresolved issues. Determine if the present cluster binary is still
compatible with the cluster hardware and resolve the issues as deemed
necessary before proceeding with this document:
# cd /etc/cmcluster
# cmgetconf CONF # create a cluster ASCII from the binary
# cmcheckconf -C CONF # verify the binary against the hardware
If cmcheckconf fails, it may be necessary to dissolve the present
cluster and create a new ASCII file. This requires that the cluster
be halted:
# cmhaltcl
# cmdeleteconf
(The creation of the new cluster configuration file comes in step 10.)
2. Perform cmhaltnode on the node receiving the new hostname.
3. Execute the set_parms hostname command. This will change the
hostname reference in the following files:
/etc/rc.config.d/netconf
/etc/hosts
4. On each node where they exist, change the NODE_NAME references in both
the cluster and package configuration files on:
/etc/cmcluster/cmclconfig.ascii (cluster ASCII file)
NODE_NAME
/etc/cmcluster// (package config file)
NODE_NAME
5. Update these files on both hosts with the new hostname:
~root/.rhosts or /etc/cmcluster/cmclnodelist
/etc/hosts.equiv
/etc/hosts
Update any DNS name servers as well.
6. If any, update references to the old hostname in package control
scripts. References to floating or relocatable IP addresses or names
should not be affected.
7. On the server being renamed, edit the /etc/rc.config.d/cmcluster
file to disable it's ability to join the cluster on reboot:
AUTOSTART_CMCLD=0
8. Reboot the server with the new hostname.
9. Verify hostname change:
# uname -a ; hostname
10. If the cluster was dissolved in step 1, create a new cluster ASCII file:
# cmquerycl -C /etc/cmcluster/CONF -n nodeA -n nodeB
11. Verify the configuration files and update the cluster binary file.
Example:
# cd /etc/cmcluster
# cmcheckconf -C cluster.ascii -P pkg1/pkg1.conf -P pkg2/pkg2.conf ...
# cmapplyconf -C cluster.ascii -P pkg1/pkg1.conf -P pkg2/pkg2.conf ...
12. Use the cmrunnode command to bring the
node into the cluster. Move packages to it as necessary.
13. Edit the /etc/rc.config.d/cmcluster file on each node
to enable automatic cluster startup upon system boot.
AUTOSTART_CMCLD=1
regds,
Deepak
"There is always some scope for improvement"
