The <a href="https://corosync.github.io/corosync/">Corosync Cluster Engine</a> is a Group Communication System with additional features for implementing high availability within applications.
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<p>Corosync is used as a High Availability framework by projects such as Apache Qpid and Pacemaker.</p>
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<h3>Virtual synchrony</h3>
<p>A closed process group communication model with virtual synchrony guarantees for creating replicated state machines.</p>
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<h3>Availability</h3>
<p>A simple availability manager that restarts the application process when it has failed.</p>
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<h3>Information</h3>
<p>A configuration and statistics in-memory database that provide the ability to set, retrieve, and receive change notifications of information.</p>
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<h3>Quorum</h3>
<p>A quorum system that notifies applications when quorum is achieved or lost.</p>