第7.1.4 mongodb4.x增加分片

￡神魔★判官ぃ 2022-02-19 00:23 242阅读 0赞

使用过elasticsearch的人应该都知道，es的动态分片很强大，看看下图，数据、备份节点管理由es自己完成  
![1][]  
我在[第7.1.1Spring操作mongodb之mongodb4.x集群搭建][7.1.1Spring_mongodb_mongodb4.x]中参考了[MongoDB4.0.2分片+副本集集群搭建][MongoDB4.0.2],莫非mongodb的分片必须手工指定吗？  
先看看[10分钟完成MongoDB的容量规划及硬件配置][10_MongoDB]  
按照一主、一从、一仲裁的模式，每次新增节点岂不是3的倍数？  
我们不需要再创建config server了，于是新增的节点中创建下面的目录,其中`mongos.conf`内容不用改变

mkdir -p /application/data/mongodb/mongos/log
    mkdir -p /application/data/mongodb/shard4/data
    mkdir -p /application/data/mongodb/shard4/log
    mkdir -p /application/data/mongodb/shard5/data
    mkdir -p /application/data/mongodb/shard5/log
    mkdir -p /application/data/mongodb/shard6/data
    mkdir -p /application/data/mongodb/shard6/log

# shared4.conf
    systemLog:
      destination: file
      logAppend: true
      path: /application/data/mongodb/shard4/log/shared4.log
     
    # Where and how to store data.
    storage:
      dbPath: /application/data/mongodb/shard4/data
      journal:
        enabled: true
    
    # how the process runs
    processManagement:
      fork: true
      pidFilePath: /application/data/mongodb/shard4/log/shard4.pid
     
    # network interfaces
    net:
      port: 27004
      bindIp: 0.0.0.0
     
    #operationProfiling:
    replication:
        replSetName: shard4     
    
    sharding:
        clusterRole: shardsvr

systemLog:
      destination: file
      logAppend: true
      path: /application/data/mongodb/shard5/log/shared5.log
     
    # Where and how to store data.
    storage:
      dbPath: /application/data/mongodb/shard5/data
      journal:
        enabled: true
    
    # how the process runs
    processManagement:
      fork: true
      pidFilePath: /application/data/mongodb/shard5/log/shard5.pid
     
    # network interfaces
    net:
      port: 27005
      bindIp: 0.0.0.0
     
    #operationProfiling:
    replication:
        replSetName: shard5     
    
    sharding:
        clusterRole: shardsvr

systemLog:
      destination: file
      logAppend: true
      path: /application/data/mongodb/shard6/log/shared6.log
     
    # Where and how to store data.
    storage:
      dbPath: /application/data/mongodb/shard6/data
      journal:
        enabled: true
    
    # how the process runs
    processManagement:
      fork: true
      pidFilePath: /application/data/mongodb/shard1/log/shard6.pid
     
    # network interfaces
    net:
      port: 27006
      bindIp: 0.0.0.0
     
    #operationProfiling:
    replication:
        replSetName: shard6     
    
    sharding:
        clusterRole: shardsvr

执行下面的命令，启动shard

mongod -f /application/data/mongodb/config/shard4.conf
    mongod -f /application/data/mongodb/config/shard5.conf
    mongod -f /application/data/mongodb/config/shard6.conf

再对分片进行配置

mongo --port 27004
    
    config = {
        _id : "shard4",
         members : [
             {_id : 0, host : "bwhs163:27004", priority : 2 },
             {_id : 1, host : "bwhs164:27004" , arbiterOnly :true},
             {_id : 2, host : "bwhs165:27004", priority : 1 }
         ]
    }
    rs.initiate(config)
    
    
    mongo --port 27005
    
    config = {
        _id : "shard5",
         members : [
             {_id : 0, host : "bwhs163:27005", priority : 1 },
             {_id : 1, host : "bwhs164:27005" , priority :2},
             {_id : 2, host : "bwhs165:27005", arbiterOnly :true }
         ]
    }
    rs.initiate(config)
    
    mongo --port 27006
    config = {
        _id : "shard6",
         members : [
             {_id : 0, host : "bwhs163:27006", arbiterOnly :true },
             {_id : 1, host : "bwhs164:27006" , priority :2},
             {_id : 2, host : "bwhs165:27006", priority : 2 }
         ]
    }
    rs.initiate(config)

执行命令`mongos -f /application/data/mongodb/config/mongos.conf`,接着添加分片就可以了

mongo --port 20000
    use admin
    sh.addShard("shard4/bwhs163:27004,bwhs164:27004,bwhs164:27004")
    sh.addShard("shard5/bwhs163:27005,bwhs164:27005,bwhs164:27005")
    sh.addShard("shard6/bwhs163:27006,bwhs164:27006,bwhs164:27006")

执行`db.stats()`就可以看到对应的数据库在哪个分片了。  
![1][1 1]

[1]: /images/20220219/a6c07c4b6a694991b5ded5922f438820.png
[7.1.1Spring_mongodb_mongodb4.x]: https://blog.csdn.net/warrah/article/details/84107049
[MongoDB4.0.2]: https://www.jianshu.com/p/e1855a1d38b7
[10_MongoDB]: http://www.mongoing.com/archives/878
[1 1]: /images/20220219/023db97be37e4deb8cba86a3bc24eb55.png