etcd api常用操作

如果需要使用v2 version api，启动etcd时候需要加入“ETCD_ENABLE_V2=true”参数，否则会报错“404 page not found”

获取etcd版本信息

# curl -L http://172.16.101.55:2379/version
{"etcdserver":"3.4.1","etcdcluster":"3.4.0"}

获取etcd健康状态

# curl -L http://172.16.101.55:2379/health
{"health":"true"}

新建key message值为“Hello world”

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world"
{"action":"set","node":{"key":"/message","value":"Hello world","modifiedIndex":18,"createdIndex":18}}

查看key

# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","modifiedIndex":18,"createdIndex":18}}

删除key

# curl http://127.0.0.1:2379/v2/keys/message -XDELETE
{"action":"delete","node":{"key":"/message","modifiedIndex":19,"createdIndex":18},"prevNode":{"key":"/message","value":"Hello world","modifiedIndex":18,"createdIndex":18}}

创建带有TTL的key

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world" -d ttl=30
{"action":"set","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:08:10.674930705Z","ttl":30,"modifiedIndex":20,"createdIndex":20}}

# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:08:10.674930705Z","ttl":2,"modifiedIndex":20,"createdIndex":20}}

取消key的TTL

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world" -d ttl=30
{"action":"set","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:10:23.220573683Z","ttl":30,"modifiedIndex":22,"createdIndex":22}}
# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:10:23.220573683Z","ttl":20,"modifiedIndex":22,"createdIndex":22}}
# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world" -d ttl= -d prevExist=true
{"action":"update","node":{"key":"/message","value":"Hello world","modifiedIndex":23,"createdIndex":22},"prevNode":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:10:23.220573683Z","ttl":16,"modifiedIndex":22,"createdIndex":22}}
# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","modifiedIndex":23,"createdIndex":22}}

重置key的TTL

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world" -d ttl=30
{"action":"set","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:15:01.34698273Z","ttl":30,"modifiedIndex":25,"createdIndex":25}}
# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:15:01.34698273Z","ttl":16,"modifiedIndex":25,"createdIndex":25}}
# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d ttl=30 -d refresh=true -d prevExist=true
{"action":"update","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:15:29.569276199Z","ttl":30,"modifiedIndex":26,"createdIndex":25},"prevNode":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:15:01.34698273Z","ttl":2,"modifiedIndex":25,"createdIndex":25}}
# curl http://127.0.0.1:2379/v2/keys/message
{"action":"get","node":{"key":"/message","value":"Hello world","expiration":"2019-09-29T08:15:29.569276199Z","ttl":27,"modifiedIndex":26,"createdIndex":25}}

 一次性watch

开启一个终端

# curl http://127.0.0.1:2379/v2/keys/message?wait=true

 重新打开二个终端，新建key

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Hello world"
{"action":"set","node":{"key":"/message","value":"Hello world","modifiedIndex":28,"createdIndex":28}}

此时第一个终端显示如下

{"action":"set","node":{"key":"/message","value":"Hello world","modifiedIndex":28,"createdIndex":28}}

再此在第一个终端执行watch

在第二个终端更新key

# curl http://127.0.0.1:2379/v2/keys/message -XPUT -d value="Nice Day"
{"action":"set","node":{"key":"/message","value":"Nice Day","modifiedIndex":29,"createdIndex":29},"prevNode":{"key":"/message","value":"Hello world","modifiedIndex":28,"createdIndex":28}}

第一个终端显示如下

{"action":"set","node":{"key":"/message","value":"Nice Day","modifiedIndex":29,"createdIndex":29},"prevNode":{"key":"/message","value":"Hello world","modifiedIndex":28,"createdIndex":28}}