mongodb添加arbiter节点的方法示例

前言

在创建mongodb的replica set的时候，只是做成了1主2从，没有做成1主1从1仲裁。这我们将一个几点从replica set中删除，再以仲裁节点的身份加入到replica set中：

1.初始状态：

shard1replset:primary> rs.status();rs.status();
{
  "set" : "shard1replset",
  "date" : isodate("2017-02-21t07:48:03.058z"),
  "mystate" : 1,
  "term" : numberlong(1),
  "heartbeatintervalmillis" : numberlong(2000),
  "optimes" : {
    "lastcommittedoptime" : {
      "ts" : timestamp(0, 0),
      "t" : numberlong(-1)
    },
    "appliedoptime" : {
      "ts" : timestamp(1487663274, 1),
      "t" : numberlong(1)
    },
    "durableoptime" : {
      "ts" : timestamp(1487587982, 1),
      "t" : numberlong(-1)
    }
  },
  "members" : [
    {
      "_id" : 0,
      "name" : "10.13.0.130:22001",
      "health" : 1,
      "state" : 1,
      "statestr" : "primary",
      "uptime" : 76672,
      "optime" : {
        "ts" : timestamp(1487663274, 1),
        "t" : numberlong(1)
      },
      "optimedate" : isodate("2017-02-21t07:47:54z"),
      "electiontime" : timestamp(1487587993, 1),
      "electiondate" : isodate("2017-02-20t10:53:13z"),
      "configversion" : 1,
      "self" : true
    },
    {
      "_id" : 1,
      "name" : "10.13.0.131:22001",
      "health" : 1,
      "state" : 2,
      "statestr" : "secondary",
      "uptime" : 75300,
      "optime" : {
        "ts" : timestamp(1487663274, 1),
        "t" : numberlong(1)
      },
      "optimedurable" : {
        "ts" : timestamp(1487587982, 1),
        "t" : numberlong(-1)
      },
      "optimedate" : isodate("2017-02-21t07:47:54z"),
      "optimedurabledate" : isodate("2017-02-20t10:53:02z"),
      "lastheartbeat" : isodate("2017-02-21t07:48:02.150z"),
      "lastheartbeatrecv" : isodate("2017-02-21t07:48:02.215z"),
      "pingms" : numberlong(0),
      "syncingto" : "10.13.0.132:22001",
      "configversion" : 1
    },
    {
      "_id" : 2,
      "name" : "10.13.0.132:22001",
      "health" : 1,
      "state" : 2,
      "statestr" : "secondary",
      "uptime" : 75300,
      "optime" : {
        "ts" : timestamp(1487663274, 1),
        "t" : numberlong(1)
      },
      "optimedurable" : {
        "ts" : timestamp(1487587982, 1),
        "t" : numberlong(-1)
      },
      "optimedate" : isodate("2017-02-21t07:47:54z"),
      "optimedurabledate" : isodate("2017-02-20t10:53:02z"),
      "lastheartbeat" : isodate("2017-02-21t07:48:02.889z"),
      "lastheartbeatrecv" : isodate("2017-02-21t07:48:01.503z"),
      "pingms" : numberlong(0),
      "syncingto" : "10.13.0.130:22001",
      "configversion" : 1
    }
  ],
  "ok" : 1
}
shard1replset:primary> 
shard1replset:primary> 
shard1replset:primary> 
shard1replset:primary> 

2.删除节点：

shard1replset:primary> rs.remove("10.13.0.132:22001"); rs.remove("10.13.0.132:22001"); 
{ "ok" : 1 }
shard1replset:primary> rs.status();rs.status();
{
  "set" : "shard1replset",
  "date" : isodate("2017-02-21t07:50:52.934z"),
  "mystate" : 1,
  "term" : numberlong(1),
  "heartbeatintervalmillis" : numberlong(2000),
  "optimes" : {
    "lastcommittedoptime" : {
      "ts" : timestamp(0, 0),
      "t" : numberlong(-1)
    },
    "appliedoptime" : {
      "ts" : timestamp(1487663447, 1),
      "t" : numberlong(1)
    },
    "durableoptime" : {
      "ts" : timestamp(1487587982, 1),
      "t" : numberlong(-1)
    }
  },
  "members" : [
    {
      "_id" : 0,
      "name" : "10.13.0.130:22001",
      "health" : 1,
      "state" : 1,
      "statestr" : "primary",
      "uptime" : 76841,
      "optime" : {
        "ts" : timestamp(1487663447, 1),
        "t" : numberlong(1)
      },
      "optimedate" : isodate("2017-02-21t07:50:47z"),
      "electiontime" : timestamp(1487587993, 1),
      "electiondate" : isodate("2017-02-20t10:53:13z"),
      "configversion" : 2,
      "self" : true
    },
    {
      "_id" : 1,
      "name" : "10.13.0.131:22001",
      "health" : 1,
      "state" : 2,
      "statestr" : "secondary",
      "uptime" : 75470,
      "optime" : {
        "ts" : timestamp(1487663447, 1),
        "t" : numberlong(1)
      },
      "optimedurable" : {
        "ts" : timestamp(1487587982, 1),
        "t" : numberlong(-1)
      },
      "optimedate" : isodate("2017-02-21t07:50:47z"),
      "optimedurabledate" : isodate("2017-02-20t10:53:02z"),
      "lastheartbeat" : isodate("2017-02-21t07:50:51.182z"),
      "lastheartbeatrecv" : isodate("2017-02-21t07:50:52.212z"),
      "pingms" : numberlong(0),
      "configversion" : 2
    }
  ],
  "ok" : 1
}
shard1replset:primary> 
shard1replset:primary> 
shard1replset:primary> 

3.添加成arbiter节点：

shard1replset:primary> rs.addarb("10.13.0.132:22001");rs.addarb("10.13.0.132:22001");
{ "ok" : 1 }
shard1replset:primary> 
shard1replset:primary> rs.status();rs.status();
{
  "set" : "shard1replset",
  "date" : isodate("2017-02-21t07:54:05.161z"),
  "mystate" : 1,
  "term" : numberlong(1),
  "heartbeatintervalmillis" : numberlong(2000),
  "optimes" : {
    "lastcommittedoptime" : {
      "ts" : timestamp(0, 0),
      "t" : numberlong(-1)
    },
    "appliedoptime" : {
      "ts" : timestamp(1487663637, 1),
      "t" : numberlong(1)
    },
    "durableoptime" : {
      "ts" : timestamp(1487587982, 1),
      "t" : numberlong(-1)
    }
  },
  "members" : [
    {
      "_id" : 0,
      "name" : "10.13.0.130:22001",
      "health" : 1,
      "state" : 1,
      "statestr" : "primary",
      "uptime" : 77034,
      "optime" : {
        "ts" : timestamp(1487663637, 1),
        "t" : numberlong(1)
      },
      "optimedate" : isodate("2017-02-21t07:53:57z"),
      "electiontime" : timestamp(1487587993, 1),
      "electiondate" : isodate("2017-02-20t10:53:13z"),
      "configversion" : 3,
      "self" : true
    },
    {
      "_id" : 1,
      "name" : "10.13.0.131:22001",
      "health" : 1,
      "state" : 2,
      "statestr" : "secondary",
      "uptime" : 75662,
      "optime" : {
        "ts" : timestamp(1487663637, 1),
        "t" : numberlong(1)
      },
      "optimedurable" : {
        "ts" : timestamp(1487587982, 1),
        "t" : numberlong(-1)
      },
      "optimedate" : isodate("2017-02-21t07:53:57z"),
      "optimedurabledate" : isodate("2017-02-20t10:53:02z"),
      "lastheartbeat" : isodate("2017-02-21t07:54:03.210z"),
      "lastheartbeatrecv" : isodate("2017-02-21t07:54:02.211z"),
      "pingms" : numberlong(0),
      "configversion" : 3
    },
    {
      "_id" : 2,
      "name" : "10.13.0.132:22001",
      "health" : 1,
      "state" : 7,
      "statestr" : "arbiter",
      "uptime" : 5,
      "lastheartbeat" : isodate("2017-02-21t07:54:03.214z"),
      "lastheartbeatrecv" : isodate("2017-02-21t07:54:02.274z"),
      "pingms" : numberlong(0),
      "configversion" : 3
    }
  ],
  "ok" : 1
}
shard1replset:primary> 

注1： mongodb 3.4之后，虽然要求config server为replica set，但是不支持arbiter。

添加的时候，会报错：

cfgreplset:primary> rs.addarb("10.13.0.132:21000");rs.addarb("10.13.0.132:21000");
{
  "ok" : 0,
  "errmsg" : "arbiters are not allowed in replica set configurations being used for config servers",
  "code" : 103,
  "codename" : "newreplicasetconfigurationincompatible"
}
cfgreplset:primary> 

注2：rs.reconfig()也可以进行操作，效果类似re.remove+rs.addarb，详见：mongodb官方文档- remove members from replica set

总结

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