Version v2.3 of This version of etcd is no longer supported. For the latest version, please see the latest stable version. For the latest stable documentation, see v3.5.
Glossary
This document defines the various terms used in etcd documentation, command line and source code.
Node
Node is an instance of raft state machine.
It has a unique identification, and records other nodes’ progress internally when it is the leader.
Member
Member is an instance of etcd. It hosts a node, and provides service to clients.
Cluster
Cluster consists of several members.
The node in each member follows raft consensus protocol to replicate logs. Cluster receives proposals from members, commits them and apply to local store.
Peer
Peer is another member of the same cluster.
Proposal
A proposal is a request (for example a write request, a configuration change request) that needs to go through raft protocol.
Client
Client is a caller of the cluster’s HTTP API.
Machine (deprecated)
The alternative of Member in etcd before 2.0
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