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+Linux-HA heartbeat
+
+Heartbeat is a daemon that provides cluster infrastructure
+(communication and membership) services to its clients. This allows
+clients to know about the presence (or disappearance!) of peer
+processes on other machines and to easily exchange messages with them.
+
+Heartbeat still comes with an integrated primitive resource
+manager, which basically is just a shell script. This is also
+referred to as "v1 style" or "haresources style" configuration.
+
+You might also want to install cluster-glue, heartbeat, resource-agents,
+fence-agents.