2019-09-17 14:25:46 -04:00
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[[high-availability]]
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= Set up a cluster for high availability
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[partintro]
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--
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2020-06-05 12:08:45 -04:00
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Your data is important to you. Keeping it safe and available is important
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to {es}. Sometimes your cluster may experience hardware failure or a power
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loss. To help you plan for this, {es} offers a number of features
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to achieve high availability despite failures.
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* With proper planning, a cluster can be
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<<high-availability-cluster-design,designed for resilience>> to many of the
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things that commonly go wrong, from the loss of a single node or network
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connection right up to a zone-wide outage such as power loss.
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* You can use <<xpack-ccr,{ccr}>> to replicate data to a remote _follower_
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cluster which may be in a different data centre or even on a different
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continent from the leader cluster. The follower cluster acts as a hot
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standby, ready for you to fail over in the event of a disaster so severe that
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the leader cluster fails. The follower cluster can also act as a geo-replica
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to serve searches from nearby clients.
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* The last line of defence against data loss is to take
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<<backup-cluster,regular snapshots>> of your cluster so that you can restore
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a completely fresh copy of it elsewhere if needed.
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2019-09-17 14:25:46 -04:00
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--
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2020-06-05 12:08:45 -04:00
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include::high-availability/cluster-design.asciidoc[]
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2019-09-17 14:25:46 -04:00
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include::high-availability/backup-cluster.asciidoc[]
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include::ccr/index.asciidoc[]
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