Introduction

etcd Overview

etcd is a highly consistent and distributed key-value storage service that provides a reliable way to store data that needs to be accessed in a distributed system or host cluster.

An etcd cluster usually consists of three or five nodes. A consensus algorithm Raft is used to implement consistency and collaboration of multiple nodes in a distributed system. The algorithm selects a leader node, and the other nodes are followers. The leader synchronizes and distributes data. It synchronizes logs to followers to ensure that each node in this cluster has a copy of data. The leader periodically sends heartbeat packets to all nodes. If a node does not receive heartbeat packets within a specified period, a new leader will be elected.

Recommended Version

etcd 3.1.20