etcd rest api基本操作

访问

http://discovery.etcd.io/e77afb997af5a84983baa98fd42cf12f

返回

{
    "action": "get", 
    "node": {
        "key": "/_etcd/registry/e77afb997af5a84983baa98fd42cf12f", 
        "dir": true, 
        "nodes": [
            {
                "key": "/_etcd/registry/e77afb997af5a84983baa98fd42cf12f/4eb2dcba58da982f", 
                "value": "etcd0=http://192.168.99.101:2380", 
                "modifiedIndex": 1113260929, 
                "createdIndex": 1113260929
            }, 
            {
                "key": "/_etcd/registry/e77afb997af5a84983baa98fd42cf12f/aa5569b385caf33b", 
                "value": "etcd2=http://192.168.99.103:2380", 
                "modifiedIndex": 1113261715, 
                "createdIndex": 1113261715
            }, 
            {
                "key": "/_etcd/registry/e77afb997af5a84983baa98fd42cf12f/f84fe4a4e816e778", 
                "value": "etcd1=http://192.168.99.102:2380", 
                "modifiedIndex": 1113261726, 
                "createdIndex": 1113261726
            }
        ], 
        "modifiedIndex": 1113260647, 
        "createdIndex": 1113260647
    }
}

操作

查看版本

curl http://192.168.99.101:2379/version

返回

{"etcdserver":"2.3.6","etcdcluster":"2.3.0"}

查看键

curl http://192.168.99.101:2379/v2/keys

返回

{"action":"get","node":{"dir":true}}

创建键值

put方法如果key之前存在，则默认会先删除，再新建一个key。
如果想要直接update，则追加 -d prevExist=true，但是加了这个参数，如果key之前不存在会报错。

curl http://192.168.99.101:2379/v2/keys/hello -XPUT -d value="world"

返回

{
    "action": "set", 
    "node": {
        "key": "/hello", 
        "value": "world", 
        "modifiedIndex": 8, 
        "createdIndex": 8
    }
}

创建目录

curl http://192.168.99.101:2379/v2/keys/dir -XPUT -d dir=true

返回

{
    "action": "set", 
    "node": {
        "key": "/dir", 
        "dir": true, 
        "modifiedIndex": 9, 
        "createdIndex": 9
    }
}

查看键

curl http://192.168.99.101:2379/v2/keys

返回

{
    "action": "get", 
    "node": {
        "dir": true, 
        "nodes": [
            {
                "key": "/hello", 
                "value": "world", 
                "modifiedIndex": 8, 
                "createdIndex": 8
            }, 
            {
                "key": "/dir", 
                "dir": true, 
                "modifiedIndex": 9, 
                "createdIndex": 9
            }
        ]
    }
}

创建带ttl的键值

单位为秒

curl http://192.168.99.101:2379/v2/keys/ttlvar -XPUT -d value="ttl_value" -d ttl=10 

返回

{
    "action": "set", 
    "node": {
        "key": "/ttlvar", 
        "value": "ttl_value", 
        "expiration": "2016-06-04T13:11:00.406180341Z", 
        "ttl": 10, 
        "modifiedIndex": 10, 
        "createdIndex": 10
    }
}

创建有序键值

curl http://192.168.99.101:2379/v2/keys/seqvar -XPOST -d value="seq1"
curl http://192.168.99.101:2379/v2/keys/seqvar -XPOST -d value="seq2"
curl http://192.168.99.101:2379/v2/keys/seqvar -XPOST -d value="seq3"
curl http://192.168.99.101:2379/v2/keys/seqvar

返回

{
    "action": "get", 
    "node": {
        "key": "/seqvar", 
        "dir": true, 
        "nodes": [
            {
                "key": "/seqvar/00000000000000000012", 
                "value": "seq1", 
                "modifiedIndex": 12, 
                "createdIndex": 12
            }, 
            {
                "key": "/seqvar/00000000000000000013", 
                "value": "seq2", 
                "modifiedIndex": 13, 
                "createdIndex": 13
            }, 
            {
                "key": "/seqvar/00000000000000000014", 
                "value": "seq3", 
                "modifiedIndex": 14, 
                "createdIndex": 14
            }
        ], 
        "modifiedIndex": 12, 
        "createdIndex": 12
    }
}

删除指定的键

curl http://192.168.99.101:2379/v2/keys/for_delete -XPUT -d value="fordelete"
curl http://192.168.99.101:2379/v2/keys/
curl http://192.168.99.101:2379/v2/keys/for_delete -XDELETE
curl http://192.168.99.101:2379/v2/keys/

返回

{
    "action": "delete", 
    "node": {
        "key": "/for_delete", 
        "modifiedIndex": 16, 
        "createdIndex": 15
    }, 
    "prevNode": {
        "key": "/for_delete", 
        "value": "fordelete", 
        "modifiedIndex": 15, 
        "createdIndex": 15
    }
}

成员管理

列出所有集群成员

curl http://192.168.99.101:2379/v2/members

返回

{
    "members": [
        {
            "id": "4eb2dcba58da982f", 
            "name": "etcd0", 
            "peerURLs": [
                "http://192.168.99.101:2380"
            ], 
            "clientURLs": [
                "http://192.168.99.101:2379", 
                "http://192.168.99.101:4001"
            ]
        }, 
        {
            "id": "aa5569b385caf33b", 
            "name": "etcd2", 
            "peerURLs": [
                "http://192.168.99.103:2380"
            ], 
            "clientURLs": [
                "http://192.168.99.103:2379", 
                "http://192.168.99.103:4001"
            ]
        }, 
        {
            "id": "f84fe4a4e816e778", 
            "name": "etcd1", 
            "peerURLs": [
                "http://192.168.99.102:2380"
            ], 
            "clientURLs": [
                "http://192.168.99.102:2379", 
                "http://192.168.99.102:4001"
            ]
        }
    ]
}

统计信息

查看leader

curl http://192.168.99.101:2379/v2/stats/leader

返回

{
    "leader": "4eb2dcba58da982f", 
    "followers": {
        "aa5569b385caf33b": {
            "latency": {
                "current": 0.001687, 
                "average": 0.0026333315088053265, 
                "standardDeviation": 0.0082522530707236, 
                "minimum": 0.000508, 
                "maximum": 0.184366
            }, 
            "counts": {
                "fail": 0, 
                "success": 8404
            }
        }, 
        "f84fe4a4e816e778": {
            "latency": {
                "current": 0.001158, 
                "average": 0.017216567181926247, 
                "standardDeviation": 1.236027691414708, 
                "minimum": 0.000493, 
                "maximum": 113.333953
            }, 
            "counts": {
                "fail": 0, 
                "success": 8410
            }
        }
    }
}

节点自身信息

curl http://192.168.99.101:2379/v2/stats/self

返回

{
    "name": "etcd0", 
    "id": "4eb2dcba58da982f", 
    "state": "StateLeader", 
    "startTime": "2016-06-04T12:51:22.901345036Z", 
    "leaderInfo": {
        "leader": "4eb2dcba58da982f", 
        "uptime": "28m29.401994375s", 
        "startTime": "2016-06-04T12:51:23.406751734Z"
    }, 
    "recvAppendRequestCnt": 0, 
    "sendAppendRequestCnt": 17544, 
    "sendPkgRate": 10.52589669646476, 
    "sendBandwidthRate": 746.7071116472099
}

查看集群运行状态

curl http://192.168.99.101:2379/v2/stats/store

返回

{
    "getsSuccess": 7, 
    "getsFail": 16, 
    "setsSuccess": 8, 
    "setsFail": 0, 
    "deleteSuccess": 1, 
    "deleteFail": 0, 
    "updateSuccess": 0, 
    "updateFail": 0, 
    "createSuccess": 6, 
    "createFail": 0, 
    "compareAndSwapSuccess": 0, 
    "compareAndSwapFail": 0, 
    "compareAndDeleteSuccess": 0, 
    "compareAndDeleteFail": 0, 
    "expireCount": 1, 
    "watchers": 0
}