etcdctl

Set a key

$ etcdctl put [mykey] "[myvalue]"

$ etcdctl get [mykey]

$ etcdctl get --prefix [/myapp/]

$ etcdctl del [mykey]

$ etcdctl watch [mykey]

$ etcdctl member list

$ etcdctl endpoint health

etcdctl [global-options] command [args]

etcdctl is the command-line client for etcd, a distributed key-value store used for shared configuration and service discovery. It's a core component of Kubernetes for storing cluster state.
etcd provides strong consistency through the Raft consensus algorithm. etcdctl manages keys, watches for changes, and administers the cluster.

put key value

Set key to value.

Get key value.

Delete key.

Watch key for changes.

Apply operation to keys with prefix.

List cluster members.

Add cluster member.

Remove cluster member.

Check endpoint health.

Save cluster snapshot.

Restore from snapshot.

etcd endpoints.

CA certificate.

Client certificate.

Client key.

API version 3 is default (set ETCDCTL_API=3). Authentication may be required. Cluster operations need careful planning. Snapshots should be taken regularly. Large values impact performance.

etcd was created by CoreOS in 2013 as a distributed configuration store for their Container Linux. It became a CNCF project and is now maintained by the etcd community. Kubernetes adopted etcd as its backing store from the beginning.

kubectl(1), consul(1), zookeeper(1)