Sérgio’s blog

The Redhat cluster manager uses a cluster configuration system (man ccs) which can be managed by the ccs_tool tool.

To change the configuration file /etc/cluster/cluster.conf you have to follow the steps outlined below on the first node of your cluster:

1. backup current cluster.conf
2. copy /etc/cluster/cluster.conf to say /tmp/cluster.conf
3. make the necessary changes to /tmp/cluster.conf
   1. Change also the config_version attribute of the cluster tag at line 2 increasing the value by 1.
4. run ccs_tool with the update option:  ccs_tool update /tmp/cluster.conf
5. if you’re using cman then run: cman_tool version -r <new config version>

If you don’t do item 5. and you’re using cman then your nodes will not be able to rejoin the cluster. To recover do the following:

1. On the first node run cman_tool version -r <new config version>.
2. On the other nodes restart the cman service.
3. Restart ccsd
4. Start rgmanager