基本概念

etcd是一个分布式、强一致性，高可靠性的开源键值对存储系统，通常被用来配置管理或者服务发现，K8s就是用它来存储所有集群的状态信息的。

etcd is a strongly consistent, distributed key-value store that provides a reliable way to store data that needs to be accessed by a distributed system or cluster of machines. It gracefully handles leader elections during network partitions and can tolerate machine failure, even in the leader node.