查看当前集群信息

# etcdctl member list --write-out=table

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

|        ID        | STATUS  |        NAME        |           PEER ADDRS           |                    CLIENT ADDRS                     | IS LEARNER |

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

| 44d8bc3300880bcd | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-01:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |

| 7796493c3943f891 | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-04:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |

| d446fbe3296eb85a | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-03:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |

| e9136c1ad1754783 | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-02:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

# etcdctl endpoint status --endpoints=http://sht-sgmhadoopdn-01:2379,http://sht-sgmhadoopdn-02:2379,http://sht-sgmhadoopdn-03:2379,http://sht-sgmhadoopdn-04:2379 --write-out=table

+--------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

|            ENDPOINT            |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |

+--------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

| http://sht-sgmhadoopdn-01:2379 | 44d8bc3300880bcd |   3.4.1 |   16 kB |     false |      false |        17 |         38 |                 38 |        |

| http://sht-sgmhadoopdn-02:2379 | e9136c1ad1754783 |   3.4.1 |   16 kB |     false |      false |        17 |         38 |                 38 |        |

| http://sht-sgmhadoopdn-03:2379 | d446fbe3296eb85a |   3.4.1 |   16 kB |     false |      false |        17 |         38 |                 38 |        |

| http://sht-sgmhadoopdn-04:2379 | 7796493c3943f891 |   3.4.1 |   20 kB |      true |      false |        17 |         38 |                 38 |        |

+--------------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

# etcdctl endpoint health --endpoints=http://sht-sgmhadoopdn-01:2379,http://sht-sgmhadoopdn-02:2379,http://sht-sgmhadoopdn-03:2379,http://sht-sgmhadoopdn-04:2379 --write-out=table

+--------------------------------+--------+------------+-------+

|            ENDPOINT            | HEALTH |    TOOK    | ERROR |

+--------------------------------+--------+------------+-------+

| http://sht-sgmhadoopdn-04:2379 |   true | 5.329583ms |       |

| http://sht-sgmhadoopdn-02:2379 |   true | 5.943424ms |       |

| http://sht-sgmhadoopdn-03:2379 |   true | 4.715634ms |       |

| http://sht-sgmhadoopdn-01:2379 |   true | 6.611197ms |       |

+--------------------------------+--------+------------+-------+

将节点sht-sgmhadoopdn-04移除

# etcdctl member remove 7796493c3943f891

Member 7796493c3943f891 removed from cluster 69bef0b9ccf44365
# etcdctl member list --write-out=table

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

|        ID        | STATUS  |        NAME        |           PEER ADDRS           |                    CLIENT ADDRS                     | IS LEARNER |

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

| 44d8bc3300880bcd | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-01:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-01:2379 |      false |

| d446fbe3296eb85a | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-03:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |

| e9136c1ad1754783 | started | sht-sgmhadoopdn- | http://sht-sgmhadoopdn-02:2380 | http://10.0.0.1:2379,http://sht-sgmhadoopdn-02:2379 |      false |

+------------------+---------+--------------------+--------------------------------+-----------------------------------------------------+------------+

修改配置文件etcd.conf，修改参数ETCD_INITIAL_CLUSTER并移除节点信息，重启etcd服务

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