原英文版地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/high-availability.html, 原文档版权归 www.elastic.co 所有
本地英文版地址: ../en/high-availability.html
本地英文版地址: ../en/high-availability.html
重要: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 当前版本文档。
Set up a cluster for high availabilityedit
Your data is important to you. Keeping it safe and available is important to Elasticsearch. Sometimes your cluster may experience hardware failure or a power loss. To help you plan for this, Elasticsearch offers a number of features to achieve high availability despite failures.
- With proper planning, a cluster can be designed for resilience to many of the things that commonly go wrong, from the loss of a single node or network connection right up to a zone-wide outage such as power loss.
- You can use cross-cluster replication to replicate data to a remote follower cluster which may be in a different data centre or even on a different continent from the leader cluster. The follower cluster acts as a hot standby, ready for you to fail over in the event of a disaster so severe that the leader cluster fails. The follower cluster can also act as a geo-replica to serve searches from nearby clients.
- The last line of defence against data loss is to take regular snapshots of your cluster so that you can restore a completely fresh copy of it elsewhere if needed.