Pacemaker is a cluster resource manager.
It achieves maximum availability for your cluster services (aka. resources) by detecting and recovering from node and resource-level failures by making use of the messaging and membership capabilities provided by your preferred cluster infrastructure (either
Corosync or
Heartbeat.
Pacemaker’s key features include:
Detection and recovery of node and service-level failures
Storage agnostic, no requirement for shared storage
Resource agnostic, anything that can be scripted can be clustered
Supports
STONITH for ensuring data integrity
Supports large and small clusters
Automatically replicated configuration that can be updated from any node
Ability to specify cluster-wide service ordering, colocation and anti-colocation
Support for advanced services type
Clones: for services which need to be active on multiple nodes
Multi-state: for services with multiple modes (eg. master/slave, primary/secondary)
