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详细介绍 - [ etcd v2.0.4 ]
etcd 2.0 发布了，这是官方首个主要的稳定版本，与上一个 0.4.6
版本比较，该版本值得关注的改进有：
内部协议的改进以避免意外的错误配置
etcdctl backup
命令用于轻松的从集群失败中恢复
etcdctl member list/add/remove 命令用于轻松管理集群
改进磁盘存储的安全性，使用
CRC 校验和只追加的行为
An improved Raft consensus implementation already used in other
projects like CockroachDB
More rigorous and faster running tests of the
underlying Raft implementation, covering all state machine and cases explained
in the original Raft white paper in 1.5 seconds
Additional administrator
focused documentation explaining common scenarios
Official IANA assigned
ports for etcd TCP 2379/2380
etcd 是一个高可用的 Key/Value 存储系统，主要用于分享配置和服务发现。etcd
的灵感来自于 ZooKeeper 和 Doozer，侧重于：
简单：支持 curl 方式的用户 API (HTTP+JSON)
安全：可选 SSL
客户端证书认证
快速：单实例可达每秒 1000 次写操作
可靠：使用 Raft 实现分布式
Tag: etcd 一个 高可 用的 Key Value 存储 系统 主要
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