1.每个节点上分别创建新的shard3配置文件
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[root@ip-10-1-2-68 etc]# more shard3.conf
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logpath=/usr/local/mongodb/logs/mongo_shard3.log
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logappend=true # need logrotae scripts
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fork=true
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journal=true
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port=27017
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#vvvvv = true
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#diaglog = 3
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dbpath=/usr/local/mongodb/shard3
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pidfilepath=/usr/local/mongodb/logs/mongo_shard3.pid
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bind_ip=10.1.2.68 ---bind ip 修改为自己的机器
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replSet=shard3
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shardsvr=true
2. 每个节点启动shard3 服务
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[root@ip-10-1-2-68 etc]# /usr/local/mongodb/bin/mongod -f shard3.conf
3.登陆第一个节点，搭建shard3的复制集
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[root@ip-10-1-2-32 etc]# /usr/local/mongodb/bin/mongo 10.1.2.32:27017
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MongoDB shell version v3.6.4
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connecting to: mongodb://10.1.2.32:27017/test
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MongoDB server version: 3.6.4
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Server has startup warnings:
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten]
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten]
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten]
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** We suggest setting it to 'never'
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten]
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten] ** We suggest setting it to 'never'
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2018-05-08T03:26:23.290+0000 I CONTROL [initandlisten]
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> config_rs3 = {_id: 'shard3', members: [{_id: 0, host: '10.1.2.32:27017', priority:1}, {_id: 1, host: '10.1.2.68:27017'},{_id: 2, host: '10.1.2.175:27017'}]}
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{
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"_id" : "shard3",
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"members" : [
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{
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"_id" : 0,
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"host" : "10.1.2.32:27017",
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"priority" : 1
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},
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{
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"_id" : 1,
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"host" : "10.1.2.68:27017"
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},
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{
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"_id" : 2,
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"host" : "10.1.2.175:27017"
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}
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]
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}
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> rs.initiate(config_rs3);
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{ "ok" : 1 }
4.登陆第一个节点的mongs端口，将shard3分片加入分片组
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[root@ip-10-1-2-32 etc]# /usr/local/mongodb/bin/mongo 10.1.2.32:30000
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MongoDB shell version v3.6.4
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connecting to: mongodb://10.1.2.32:30000/test
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MongoDB server version: 3.6.4
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Server has startup warnings:
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2018-05-03T07:47:09.379+0000 I CONTROL [main]
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2018-05-03T07:47:09.379+0000 I CONTROL [main] ** WARNING: Access control is not enabled for the database.
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2018-05-03T07:47:09.379+0000 I CONTROL [main] ** Read and write access to data and configuration is unrestricted.
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2018-05-03T07:47:09.379+0000 I CONTROL [main] ** WARNING: You are running this process as the root user, which is not recommended.
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2018-05-03T07:47:09.379+0000 I CONTROL [main]
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mongos> use admin;
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switched to db admin
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mongos> db.runCommand({ addshard: 'shard3/10.1.2.32:27017,10.1.2.68:27017,10.1.2.175:27017'})
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{
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"shardAdded" : "shard3",
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"ok" : 1,
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"$clusterTime" : {
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"clusterTime" : Timestamp(1525750332, 7),
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"signature" : {
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"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
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"keyId" : NumberLong(0)
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}
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},
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"operationTime" : Timestamp(1525750332, 7)
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}
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mongos> db.printShardingStatus(); ---查看新的分片信息
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--- Sharding Status ---
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sharding version: {
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"_id" : 1,
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"minCompatibleVersion" : 5,
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"currentVersion" : 6,
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"clusterId" : ObjectId("5aeabc4db192a4fefca1c888")
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}
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shards:
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{ "_id" : "shard1", "host" : "shard1/10.1.2.175:27019,10.1.2.32:27019,10.1.2.68:27019", "state" : 1 }
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{ "_id" : "shard2", "host" : "shard2/10.1.2.175:27018,10.1.2.32:27018,10.1.2.68:27018", "state" : 1 }
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{ "_id" : "shard3", "host" : "shard3/10.1.2.175:27017,10.1.2.32:27017,10.1.2.68:27017", "state" : 1 }
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active mongoses:
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"3.6.4" : 3
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autosplit:
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Currently enabled: yes
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balancer:
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Currently enabled: yes
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Currently running: no
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Failed balancer rounds in last 5 attempts: 0
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Migration Results for the last 24 hours:
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No recent migrations
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databases:
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{ "_id" : "config", "primary" : "config", "partitioned" : true }
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config.system.sessions
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shard key: { "_id" : 1 }
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unique: false
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balancing: true
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chunks:
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shard1 1
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{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard1 Timestamp(1, 0)
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{ "_id" : "test", "primary" : "shard2", "partitioned" : true }
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test.users
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shard key: { "_id" : 1 }
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unique: false
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balancing: true
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chunks:
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shard2 1
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{ "_id" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 } } on : shard2 Timestamp(1, 0)
5、设置均衡器
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# 查看状态
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mongos> sh.isBalancerRunning();
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false
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# 设置均衡器
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mongos> sh.setBalancerState(true);
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mongos> sh.enableBalancing("bg")
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mongos> sh.getBalancerState()
true
参考：https://docs.mongodb.com/manual/reference/method/sh.getBalancerState/
