Managing Serviceguard 14th Edition, June 2007

Understanding Serviceguard Software Components
Serviceguard Architecture
Chapter 358
Cluster Object Manager Daemon: cmomd
This daemon is responsible for providing information about the cluster to
clients—external products or tools that depend on knowledge of the state
of cluster objects.
Clients send queries to the object manager and receive responses from it
(this communication is done indirectly, through a Serviceguard API). The
queries are decomposed into categories (of classes) which are serviced by
various providers. The providers gather data from various sources,
including, commonly, the cmclconfd daemons on all connected nodes,
returning data to a central assimilation point where it is filtered to meet
the needs of a particular query.
This daemon is started by inetd(1M). There are entries in the
/etc/inetd.conf file.
This daemon may not be running on your system; it is used only by
clients of the object manager.
Cluster SNMP Agent Daemon: cmsnmpd
This daemon collaborates with the SNMP Master Agent to provide
instrumentation for the cluster Management Information Base (MIB).
The SNMP Master Agent and the cmsnmpd provide notification (traps)
for cluster-related events. For example, a trap is sent when the cluster
configuration changes, or when a Serviceguard package has failed. You
must edit /etc/SnmpAgent.d/snmpd.conf to tell cmsnmpd where to send
this information.
You must also edit /etc/rc.config.d/cmsnmpagt to auto-start
cmsnmpd. Configure cmsnmpd to start before the Serviceguard cluster
comes up.
For more information, see the cmsnmpd (1m) manpage.
Service Assistant Daemon: cmsrvassistd
This daemon forks and execs any script or processes as required by the
cluster daemon, cmcld. There are two type of forks that this daemon
carries out:
• Executing package run and halt scripts
• Launching services