[Mongodb] mongodb集群配置一主一从一仲裁


本文总阅读量次

1、首先安装在三个节点安装mongodb,安装方法详见

mongodb单点安装

2、集群节点信息：

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主：10.0.7.53
从：10.0.7.51
仲裁：10.0.7.50

3、启动主节点，进入主节点控制台，

3.1、创建管理员用户名、密码：

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shell > /data/mongodb/bin/mongo --port 30000
MongoDB Enterprise testrepl:PRIMARY>use admin
MongoDB Enterprise testrepl:PRIMARY>
db.createUser(
  {
    user: "admin",
    pwd: "abc123",
    roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
  }
)

使用userAdminAnyDatabase的role权限去查看rs.status();会提示
“not authorized on admin to execute command”,建议授予root权限：

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db.createUser(
  {
    user: "admin1",
    pwd: "admin123",
    roles: [ { role: "root", db: "admin" } ]
  }
)

3.2、查看创建的管理员信息：

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MongoDB Enterprise testrepl:PRIMARY> db.system.users.find()

3.3、退出控制台，修改配置文件mongodb.conf(每个节点都要配置)：

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security:
   authorization: enabled

4、在主节点上，生成秘钥文件

4.1、生成密钥文件，用于集群之间互相通信：

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openssl rand -base64 756 > /data/mongodb/mongodb.keyfile

4.2、更改文件权限以仅为文件所有者提供读取权限

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chmod 400 /data/mongodb/mongodb.keyfile

4.3、将密钥文件复制到每个副本集成员

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scp /data/mongodb/mongodb.keyfile root@10.0.7.51:/data/mongodb/
scp /data/mongodb/mongodb.keyfile root@10.0.7.50:/data/mongodb/

4.4、修改配置文件mongodb.conf，添加keyfile参数(每个节点都要配置)：

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security:
   keyFile: /data/mongodb/mongodb.keyfile

5、配置集群

5.1、修改配置文件mongodb.conf，添加集群配置参数(每个节点都要配置)：

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replication:
   replSetName: "testrepl"

replSetName:设置集群名称，根据自己需求自定义（三个节点要保持一直）

5.2、重新启动mongodb

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/data/mongodb/bin/mongod -f /data/mongodb/mongodb.conf

5.3、进入主节点控制台

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/data/mongodb/bin/mongo --port 30000

5.4、添加集群节点：

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use admin;
db.auth('admin','abc123');

rs.initiate( {
   _id : "testrepl",
   members: [
      { _id: 0, host: "10.0.7.53:30000" },
      { _id: 1, host: "10.0.7.50:30000" },
      { _id: 2, host: "10.0.7.51:30000","arbiterOnly" : true}
   ]
})

执行结果如下：

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{
        "ok" : 1,
        "operationTime" : Timestamp(1533388128, 1),
        "$clusterTime" : {
                "clusterTime" : Timestamp(1533388128, 1),
                "signature" : {
                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                        "keyId" : NumberLong(0)
                }
        }
}

5.5、查看集群状态

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MongoDB Enterprise testrepl:PRIMARY> rs.status();
{
        "set" : "testrepl",
        "date" : ISODate("2018-08-04T13:09:25.894Z"),
        "myState" : 1,
        "term" : NumberLong(1),
        "syncingTo" : "",
        "syncSourceHost" : "",
        "syncSourceId" : -1,
        "heartbeatIntervalMillis" : NumberLong(2000),
        "optimes" : {
                "lastCommittedOpTime" : {
                        "ts" : Timestamp(1533388160, 1),
                        "t" : NumberLong(1)
                },
                "readConcernMajorityOpTime" : {
                        "ts" : Timestamp(1533388160, 1),
                        "t" : NumberLong(1)
                },
                "appliedOpTime" : {
                        "ts" : Timestamp(1533388160, 1),
                        "t" : NumberLong(1)
                },
                "durableOpTime" : {
                        "ts" : Timestamp(1533388160, 1),
                        "t" : NumberLong(1)
                }
        },
        "lastStableCheckpointTimestamp" : Timestamp(1533388140, 1),
        "members" : [
                {
                        "_id" : 0,
                        "name" : "10.0.7.53:30000",
                        "health" : 1,
                        "state" : 1,
                        "stateStr" : "PRIMARY",
                        "uptime" : 289,
                        "optime" : {
                                "ts" : Timestamp(1533388160, 1),
                                "t" : NumberLong(1)
                        },
                        "optimeDate" : ISODate("2018-08-04T13:09:20Z"),
                        "syncingTo" : "",
                        "syncSourceHost" : "",
                        "syncSourceId" : -1,
                        "infoMessage" : "could not find member to sync from",
                        "electionTime" : Timestamp(1533388139, 1),
                        "electionDate" : ISODate("2018-08-04T13:08:59Z"),
                        "configVersion" : 1,
                        "self" : true,
                        "lastHeartbeatMessage" : ""
                },
                {
                        "_id" : 1,
                        "name" : "10.0.7.50:30000",
                        "health" : 1,
                        "state" : 2,
                        "stateStr" : "SECONDARY",
                        "uptime" : 37,
                        "optime" : {
                                "ts" : Timestamp(1533388160, 1),
                                "t" : NumberLong(1)
                        },
                        "optimeDurable" : {
                                "ts" : Timestamp(1533388160, 1),
                                "t" : NumberLong(1)
                        },
                        "optimeDate" : ISODate("2018-08-04T13:09:20Z"),
                        "optimeDurableDate" : ISODate("2018-08-04T13:09:20Z"),
                        "lastHeartbeat" : ISODate("2018-08-04T13:09:25.051Z"),
                        "lastHeartbeatRecv" : ISODate("2018-08-04T13:09:25.677Z"),
                        "pingMs" : NumberLong(3),
                        "lastHeartbeatMessage" : "",
                        "syncingTo" : "10.0.7.53:30000",
                        "syncSourceHost" : "10.0.7.53:30000",
                        "syncSourceId" : 0,
                        "infoMessage" : "",
                        "configVersion" : 1
                },
                {
                        "_id" : 2,
                        "name" : "10.0.7.51:30000",
                        "health" : 1,
                        "state" : 7,
                        "stateStr" : "ARBITER",
                        "uptime" : 37,
                        "lastHeartbeat" : ISODate("2018-08-04T13:09:25.031Z"),
                        "lastHeartbeatRecv" : ISODate("2018-08-04T13:09:24.265Z"),
                        "pingMs" : NumberLong(0),
                        "lastHeartbeatMessage" : "",
                        "syncingTo" : "",
                        "syncSourceHost" : "",
                        "syncSourceId" : -1,
                        "infoMessage" : "",
                        "configVersion" : 1
                }
        ],
        "ok" : 1,
        "operationTime" : Timestamp(1533388160, 1),
        "$clusterTime" : {
                "clusterTime" : Timestamp(1533388160, 1),
                "signature" : {
                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                        "keyId" : NumberLong(0)
                }
        }
}

5.6、从库默认为不能读写模式，如果要启动从库的读模式，进入从库执行以下命令：

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rs.slaveOk();

5.7、增加一个仲裁节点，新增节点，配置文件中密钥文件、repl参数一定要保持一致：

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rs.addArb("m1.example.net:27017")

5.8、添加一个新的从节点，添加之前设置该节点优先级为0，表决为0，以防止该节点数据未同步完成之前参与选举，待该节点数据同步完成之后，使用rs.reconfig()参数再修改其优先级和表决：

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rs.add( { host: "mongodb3.example.net:27017", priority: 0, votes: 0 } )

rs.reconfig()命令执行如下：

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var cfg = rs.conf();
cfg.members[4].priority = 1
cfg.members[4].votes = 1
rs.reconfig(cfg)
mongodb
目录
  1. 1. 1、首先安装在三个节点安装mongodb,安装方法详见
  2. 2. 2、集群节点信息：
  3. 3. 3、启动主节点，进入主节点控制台，
  4. 4. 4、在主节点上，生成秘钥文件
  5. 5. 5、配置集群

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