LifeKeeper communicates between nodes with a process called LCM. LCM queries the system for the TCP port number used for inter-node communication using the name “lcm_server”. In an environment using LDAP or Active Directory, it is important that those services and servers are highly available. If external servers are used to determine the port number (set in /etc/nsswitch.conf), LCM communication may stop unexpectedly if those servers do not respond.

To avoid LifeKeeper communication failures in cases where the LDAP or Active Directory is not reliable, configure /etc/nsswitch.conf to determine the port number from the “/etc/services” file or hard code the port number (LCMPORT) in “/etc/default/LifeKeeper”.
Set the LCMPORT value to a port number between 1024 and 65535 that is not used elsewhere. This value must be the same value set on all nodes in the cluster connected with communication paths.


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