常用
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etcd is a distributed reliable key-value store for the most critical data of a distributed system, with a focus on being::

    存储分布式系统中最关键的数据，有以下4个特点:
    Simple: well-defined, user-facing API (gRPC)
    Secure: automatic TLS with optional client cert authentication
    Fast: benchmarked 10,000 writes/sec
    Reliable: properly distributed using Raft


.. image:: https://img.zhaoweiguo.com/knowledge/images/dbs/etcds/architecture1.png