4.8. Disabling the Cluster Software

It may become necessary to temporarily disable the cluster software on a cluster member. For example, if a cluster member experiences a hardware failure, you may want to reboot that member, but prevent it from rejoining the cluster to perform maintenance on the system.

Use the /sbin/chkconfig command to stop the member from joining the cluster at boot-up as follows:

chkconfig --level 2345 rgmanager off
chkconfig --level 2345 gfs off
chkconfig --level 2345 clvmd off
chkconfig --level 2345 fenced off
chkconfig --level 2345 lock_gulmd off
chkconfig --level 2345 cman off
chkconfig --level 2345 ccsd off

Once the problems with the disabled cluster member have been resolved, use the following commands to allow the member to rejoin the cluster:

chkconfig --level 2345 rgmanager on
chkconfig --level 2345 gfs on
chkconfig --level 2345 clvmd on
chkconfig --level 2345 fenced on
chkconfig --level 2345 lock_gulmd on
chkconfig --level 2345 cman on
chkconfig --level 2345 ccsd on

You can then reboot the member for the changes to take effect or run the following commands in the order shown to restart cluster software:

  1. service ccsd start

  2. service lock_gulmd start or service cman start according to the type of lock manager used

  3. service fenced start (DLM clusters only)

  4. service clvmd start

  5. service gfs start, if you are using Red Hat GFS

  6. service rgmanager start