0.mongodb分片思想
1.mongodb之sharding-cluster(分片集群)
1.1 规划
10个实例:38017-38026 (1)configserver:38018-38020 3台构成的复制集(1主两从,不支持arbiter)38018-38020(复制集名字configsvr) (2)shard节点: sh1:38021-23 (1主两从,其中一个节点为arbiter,复制集名字sh1) sh2:38024-26 (1主两从,其中一个节点为arbiter,复制集名字sh2) (3) mongos: 38017
2.sharding节点的配置过程
2.1目录的创建
mkdir -p /mongodb/38021/conf /mongodb/38021/log /mongodb/38021/data mkdir -p /mongodb/38022/conf /mongodb/38022/log /mongodb/38022/data mkdir -p /mongodb/38023/conf /mongodb/38023/log /mongodb/38023/data mkdir -p /mongodb/38024/conf /mongodb/38024/log /mongodb/38024/data mkdir -p /mongodb/38025/conf /mongodb/38025/log /mongodb/38025/data mkdir -p /mongodb/38026/conf /mongodb/38026/log /mongodb/38026/data
2.2修改配置文件
第一组复制集的搭建(21-23 一主一从一Arb)
cat > /mongodb/38021/conf/mongodb.conf <<EOF systemLog: destination: file path: /mongodb/38021/log/mongodb.log logAppend: true storage: journal: enabled: true dbPath: /mongodb/38021/data directoryPerDB: true #engine: wiredTiger wiredTiger: engineConfig: cacheSizeGB: 1 directoryForIndexes: true collectionConfig: blockCompressor: zlib indexConfig: prefixCompression: true net: bindIp: 172.17.94.206,127.0.0.1 port: 38021 replication: oplogSizeMB: 2048 replSetName: sh1 sharding: clusterRole: shardsvr processManagement: fork: true EOF cp /mongodb/38021/conf/mongodb.conf /mongodb/38022/conf/ cp /mongodb/38021/conf/mongodb.conf /mongodb/38023/conf/ sed 's#38021#38022#g' /mongodb/38022/conf/mongodb.conf -i sed 's#38021#38023#g' /mongodb/38023/conf/mongodb.conf -i
第二组复制集的搭建(24-26 一主一从一Arb)
cat > /mongodb/38024/conf/mongodb.conf <<EOF systemLog: destination: file path: /mongodb/38024/log/mongodb.log logAppend: true storage: journal: enabled: true dbPath: /mongodb/38024/data directoryPerDB: true wiredTiger: engineConfig: cacheSizeGB: 1 directoryForIndexes: true collectionConfig: blockCompressor: zlib indexConfig: prefixCompression: true net: bindIp: 172.17.94.206,127.0.0.1 port: 38024 replication: oplogSizeMB: 2048 replSetName: sh2 sharding: clusterRole: shardsvr processManagement: fork: true EOF cp /mongodb/38024/conf/mongodb.conf /mongodb/38025/conf/ cp /mongodb/38024/conf/mongodb.conf /mongodb/38026/conf/ sed 's#38024#38025#g' /mongodb/38025/conf/mongodb.conf -i sed 's#38024#38026#g' /mongodb/38026/conf/mongodb.conf -i
2.3启动所有节点,并搭建复制集
mongod -f /mongodb/38021/conf/mongodb.conf mongod -f /mongodb/38022/conf/mongodb.conf mongod -f /mongodb/38023/conf/mongodb.conf mongod -f /mongodb/38024/conf/mongodb.conf mongod -f /mongodb/38025/conf/mongodb.conf mongod -f /mongodb/38026/conf/mongodb.conf ps -ef |grep mongod ####可以通过这个命令查询出所有的mongod的后端启动情况 mongo --port 38021 admin config = {_id: 'sh1', members: [ {_id: 0, host: '172.17.94.206:38021'}, {_id: 1, host: '172.17.94.206:38022'}, {_id: 2, host: '172.17.94.206:38023',"arbiterOnly":true}] } rs.initiate(config) mongo --port 38024 admin config = {_id: 'sh2', members: [ {_id: 0, host: '172.17.94.206:38024'}, {_id: 1, host: '172.17.94.206:38025'}, {_id: 2, host: '172.17.94.206:38026',"arbiterOnly":true}] } rs.initiate(config)
3.configserver节点
3.1 创建目录
mkdir -p /mongodb/38018/conf /mongodb/38018/log /mongodb/38018/data mkdir -p /mongodb/38019/conf /mongodb/38019/log /mongodb/38019/data mkdir -p /mongodb/38020/conf /mongodb/38020/log /mongodb/38020/data
3.2 修改配置文件
cat > /mongodb/38018/conf/mongodb.conf <<EOF systemLog: destination: file path: /mongodb/38018/log/mongodb.conf logAppend: true storage: journal: enabled: true dbPath: /mongodb/38018/data directoryPerDB: true #engine: wiredTiger wiredTiger: engineConfig: cacheSizeGB: 1 directoryForIndexes: true collectionConfig: blockCompressor: zlib indexConfig: prefixCompression: true net: bindIp: 172.17.94.206,127.0.0.1 port: 38018 replication: oplogSizeMB: 2048 replSetName: configReplSet sharding: clusterRole: configsvr processManagement: fork: true EOF cp /mongodb/38018/conf/mongodb.conf /mongodb/38019/conf/ cp /mongodb/38018/conf/mongodb.conf /mongodb/38020/conf/ sed 's#38018#38019#g' /mongodb/38019/conf/mongodb.conf -i sed 's#38018#38020#g' /mongodb/38020/conf/mongodb.conf -i
3.3启动节点并配置复制集
mongod -f /mongodb/38018/conf/mongodb.conf mongod -f /mongodb/38019/conf/mongodb.conf mongod -f /mongodb/38020/conf/mongodb.conf mongo --port 38018 admin config = {_id: 'configReplSet', members: [ {_id: 0, host: '172.17.94.206:38018'}, {_id: 1, host: '172.17.94.206:38019'}, {_id: 2, host: '172.17.94.206:38020'}] } rs.initiate(config) 注:configserver 可以是一个节点,官方建议复制集。configserver不能有arbiter。 新版本中,要求必须是复制集。 注:mongodb 3.4之后,虽然要求config server为replica set,但是不支持arbiter
4. mongo节点的配置
4.1创建目录
mkdir -p /mongodb/38017/conf /mongodb/38017/log
4.2配置文件
cat > /mongodb/38017/conf/mongos.conf <<EOF systemLog: destination: file path: /mongodb/38017/log/mongos.log logAppend: true net: bindIp: 172.17.94.206,127.0.0.1 port: 38017 sharding: configDB: configReplSet/172.17.94.206:38018,172.17.94.206:38019,172.17.94.206:38020 processManagement: fork: true EOF
4.3 启动mongos
mongos -f /mongodb/38017/conf/mongos.conf
5. 分片集群添加节点
连接到其中一个mongos(172.17.94.206),做以下配置 (1)连接到mongs的admin数据库 # su - mongod $ mongo 172.17.94.206:38017/admin (2)添加分片 db.runCommand( { addshard : "sh1/172.17.94.206:38021,172.17.94.206:38022,172.17.94.206:38023",name:"shard1"} ) db.runCommand( { addshard : "sh2/172.17.94.206:38024,172.17.94.206:38025,172.17.94.206:38026",name:"shard2"} ) (3)列出分片 mongos> db.runCommand( { listshards : 1 } ) (4)整体状态查看 mongos> sh.status();
6.chunk的拆分和迁移