The Linux-HA project provides high availability components for UNIX type operating systems.
The main component is the communication software, Heartbeat, which informs a group of machines of their respective statuses, making it possible to trigger actions in a concerted manner without requiring a third party server. Heartbeat is typically used with a cluster resource manager like Pacemaker, whose role is to manage dependencies between services and to perform automated switching. A very basic resource manager is supplied by Linux-HA, which is quite often sufficient for companies’ needs.
Linux-HA is the most widespread high availability system and many service providers cover its support. Its first components date back to 1999. The GPL v2 is most commonly used.
Linux-HA is written in C and Python.
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