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DevOps & Automation · Intermediate

etcd

A distributed, consistent key-value store that holds all Kubernetes cluster state.

Definition

etcd uses the Raft consensus algorithm and needs a majority quorum, so clusters run 3 or 5 members. Backing it up with etcdctl snapshot save is essential for disaster recovery.

Example

ETCDCTL_API=3 etcdctl snapshot save /backup/etcd.db --endpoints=https://127.0.0.1:2379 --cacert ... --cert ... --key ...

Exam tip

etcd backup and restore with etcdctl is a classic CKA task; remember the certificate flags.

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