解除过期
代码语言：javascript复制[root@docker etcd-v2.2.4-linux-amd64]# date ; curl http://127.0.0.1:2379/v2/keys/foo -XPUT -d value=bar -d ttl=10
Mon Feb 1 23:41:21 CST 2016
{"action":"set","node":{"key":"/foo","value":"bar","expiration":"2016-02-01T15:41:31.103825075Z","ttl":10,"modifiedIndex":29,"createdIndex":29}}
[root@docker etcd-v2.2.4-linux-amd64]# date ; curl http://127.0.0.1:2379/v2/keys/foo
Mon Feb 1 23:41:25 CST 2016
{"action":"get","node":{"key":"/foo","value":"bar","expiration":"2016-02-01T15:41:31.103825075Z","ttl":6,"modifiedIndex":29,"createdIndex":29}}
[root@docker etcd-v2.2.4-linux-amd64]# date; curl http://127.0.0.1:2379/v2/keys/foo -XPUT -d value=bar -d ttl= -d prevExist=true
Mon Feb 1 23:41:30 CST 2016
{"action":"update","node":{"key":"/foo","value":"bar","modifiedIndex":30,"createdIndex":29},"prevNode":{"key":"/foo","value":"bar","expiration":"2016-02-01T15:41:31.103825075Z","ttl":1,"modifiedIndex":29,"createdIndex":29}}
[root@docker etcd-v2.2.4-linux-amd64]# date ; curl http://127.0.0.1:2379/v2/keys/foo
Mon Feb 1 23:42:02 CST 2016
{"action":"get","node":{"key":"/foo","value":"bar","modifiedIndex":30,"createdIndex":29}}
[root@docker etcd-v2.2.4-linux-amd64]#变更提醒
etcd可以实现变更提醒，如果要监控子层关键字的变更可以加上 recursive=true
我们打开一个终端，输入下面命令后，会hung住
代码语言：javascript复制[root@docker ~]# curl http://127.0.0.1:2379/v2/keys/foo?wait=true然后在另一个终端中输入
代码语言：javascript复制[root@docker ~]# curl http://127.0.0.1:2379/v2/keys/foo -XPUT -d value=abc
{"action":"set","node":{"key":"/foo","value":"abc","modifiedIndex":33,"createdIndex":33},"prevNode":{"key":"/foo","value":"bar","modifiedIndex":31,"createdIndex":31}}
[root@docker ~]# 于是第一个终端里会反馈出第二个终端里的结果，并退出hung状态
