etcdv3 集群基本操作使用

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etcd是一个开源的分布式键值对数据库，他的每一个节点都有一份数据的copy，当有节点故障时保证了高可用性。etcd使用Raft算法来保证一致性。

etcd的apiv3在使用命令时需要在前面加上ETCDCTL_API=3
集群成员

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ETCDCTL_API=3 etcdctl member list

更新一个节点ip

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etcdctl member list
etcdctl member update memberID http://ip:2380

删除一个节点

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etcdctl member list  
etcdctl member remove memberID  
etcdctl member list  
ps -ef|grep etcd //在相关节点上kill掉etcd进程

测试增加一个新节点
注意：添加已经删除的需要将etcd3的rm -rf /var/lib/etcd/*必须删除
移除节点

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ETCDCTL_API=3  etcdctl --endpoints=https://192.168.7.93:2379,https://192.168.7.94:2379，https://192.168.7.92:2379   --cacert=/etc/kubernetes/ssl/ca.pem   --cert=/etc/etcd/ssl/etcd.pem   --key=/etc/etcd/ssl/etcd-key.pem  member  list -w table
ETCDCTL_API=3  etcdctl --endpoints=https://192.168.7.93:2379,https://192.168.7.94:2379，https://192.168.7.92:2379   --cacert=/etc/kubernetes/ssl/ca.pem   --cert=/etc/etcd/ssl/etcd.pem   --key=/etc/etcd/ssl/etcd-key.pem  member  remove 7d17ab970f6de141

添加节点

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 ETCDCTL_API=3  etcdctl --endpoints=https://192.168.7.93:2379,https://192.168.7.94:2379，https://192.168.7.92:2379   --cacert=/etc/kubernetes/ssl/ca.pem   --cert=/etc/etcd/ssl/etcd.pem   --key=/etc/etcd/ssl/etcd-key.pem  member add  etcd3 --peer-urls="https://192.168.7.92:2380" //查看新增成员列表，etcd3状态为unstarted
rm -rf /var/lib/etcd/*  //etcd3上面操作
vi  /etc/systemd/system/etcd.service  ///etcd3上面操作 修改--initial-cluster-state=existing 不改报错 streaming request ignored (ID mismatch got 7d17ab970f6de141 want 58662caff7c6e081)
systemctl daemon-reload && systemctl  restart   etcd  ///etcd3上面操作
ETCDCTL_API=3  etcdctl --endpoints=https://192.168.7.93:2379,https://192.168.7.94:2379，https://192.168.7.92:2379   --cacert=/etc/kubernetes/ssl/ca.pem   --cert=/etc/etcd/ssl/etcd.pem   --key=/etc/etcd/ssl/etcd-key.pem  member  list -w table