etcdctl 常用命令
1. 指定etcd集群
HOST_1=10.240.0.17
HOST_2=10.240.0.18
HOST_3=10.240.0.19
ENDPOINTS=$HOST_1:2379,$HOST_2:2379,$HOST_3:2379
etcdctl --endpoints=$ENDPOINTS member list
2. 增删查
2.1、增
etcdctl --endpoints=$ENDPOINTS put foo "Hello World!"
2.2、查
etcdctl --endpoints=$ENDPOINTS get foo
etcdctl --endpoints=$ENDPOINTS --write-out="json" get foo
基于相同前缀查找
etcdctl --endpoints=$ENDPOINTS put web1 value1
etcdctl --endpoints=$ENDPOINTS put web2 value2
etcdctl --endpoints=$ENDPOINTS put web3 value3
etcdctl --endpoints=$ENDPOINTS get web --prefix
2.3、删
etcdctl --endpoints=$ENDPOINTS put key myvalue
etcdctl --endpoints=$ENDPOINTS del key
etcdctl --endpoints=$ENDPOINTS put k1 value1
etcdctl --endpoints=$ENDPOINTS put k2 value2
etcdctl --endpoints=$ENDPOINTS del k --prefix
3. 集群状态
集群状态主要是etcdctl endpoint status 和etcdctl endpoint health两条命令。
etcdctl --write-out=table --endpoints=$ENDPOINTS endpoint status
+------------------+------------------+---------+---------+-----------+-----------+------------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | RAFT TERM | RAFT INDEX |
+------------------+------------------+---------+---------+-----------+-----------+------------+
| 10.240.0.17:2379 | 4917a7ab173fabe7 | 3.0.0 | 45 kB | true | 4 | 16726 |
| 10.240.0.18:2379 | 59796ba9cd1bcd72 | 3.0.0 | 45 kB | false | 4 | 16726 |
| 10.240.0.19:2379 | 94df724b66343e6c | 3.0.0 | 45 kB | false | 4 | 16726 |
+------------------+------------------+---------+---------+-----------+-----------+------------+
etcdctl --endpoints=$ENDPOINTS endpoint health
10.240.0.17:2379 is healthy: successfully committed proposal: took = 3.345431ms
10.240.0.19:2379 is healthy: successfully committed proposal: took = 3.767967ms
10.240.0.18:2379 is healthy: successfully committed proposal: took = 4.025451ms
4. 集群成员
跟集群成员相关的命令如下：
member add Adds a member into the cluster
member remove Removes a member from the cluster
member update Updates a member in the cluster
member list Lists all members in the cluster
例如 etcdctl member list 列出集群成员的命令。
$ etcdctl --write-out=table --endpoints=$ENDPOINTS endpoint status
+-----------------+------------------+-----------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+-----------------+------------------+-----------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 127.0.0.1:12379 | 8211f1d0f64f3269 | 3.3.0+git | 25 kB | false | false | 2 | 17 | 17 | |
| 127.0.0.1:22379 | 91bc3c398fb3c146 | 3.3.0+git | 25 kB | false | false | 2 | 17 | 17 | |
| 127.0.0.1:32379 | fd422379fda50e48 | 3.3.0+git | 25 kB | true | false | 2 | 17 | 17 | |
+-----------------+------------------+-----------+---------+-----------+------------+-----------+------------+--------------------+--------+
文章参考：https://coreos.com/etcd/docs/latest/demo.html
