mongodb-sharding 分片

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iptables -I INPUT -p tcp --dport 27017 -j ACCEPT

iptables -I INPUT -p tcp --dport 27018 -j ACCEPT

iptables -I INPUT -p tcp --dport 27019 -j ACCEPT

mongodb 集群一般是shard(分片)+ replicateSet（副本集）＋mongos(路由)＋config(配置服务)

环境 3个分片

mongos 192.168.0.10:27019,192.168.0.11:27019,192.168.0.12:27019

config 192.168.0.1:27018,192.168.0.2:27018,192.168.0.3:27018

sharding:shard001、shard002、shard003

replSet:shard001 192.168.1.1:27017, 192.168.1.2:27017, 192.168.1.3:27017

replSet:shard002 192.168.1.4:27017, 192.168.1.5:27017, 192.168.1.6:27017

replSet:shard003 192.168.1.7:27017, 192.168.1.8:27017, 192.168.1.9:27017

一、配置-路由 mongos

#/opt/db/confg/mongo.conf

fork=true

quiet=true

configdb=192.168.0.1:27018,192.168.0.2:27018,192.168.0.3:27018

port=27019

pidfilepath=/opt/db/mongo/mongos.pid

logpath=/var/log/mongo/mongos.log

maxConns=20000

二、配置-配置服务器 config

#/opt/db/confg/mongo.conf

fork=true

quiet=true

port=27018

dbpath=/opt/db/mongo/

logpath=/var/log/mongo/mongoconfig.log

pidfilepath=/opt/db/mongo/mongoconfig.pid

logappend=true

configsvr=true

directoryperdb=true

maxConns=20000

三、配置每个分片的副本集的配置文件

可参见<副本集--MongoDB副本集（Linux）>

再在配置中加入 shardsvr=true

即：

#配置文件mongodb.conf存放路径为 /opt/confg/mongo/mongodb.conf

dbpath=/opt/mongodb/data/

logpath=/var/log/mongodb/mongodb.log

pidfilepath=/opt/mongodb/data/mongodb.pid

logappend=true

fork=true

port=27017

quiet=true

directoryperdb=true

replSet=shard001

oplogSize=10240 #(MB单位）

maxConns=20000

shardsvr=true

四、先启动 config （mongod）

runuser -c "/opt/db/mongo/bin/mongod -f /opt/db/confg/mongo.conf" mongod

五、再启动 mongos

runuser -c "/opt/db/mongo/bin/mongos -f /opt/db/confg/mongo.conf" mongod

六、登录mongs 初始化分片关系

mongos>use admin

mongos>db.adminCommand({"addShard":"shard001/192.168.1.1:27017,192.168.1.2:27017,192.168.1.3:27017"});

mongos>db.adminCommand({"addShard":"shard002/192.168.1.4:27017,192.168.1.5:27017,192.168.1.6:27017"});

mongos>db.adminCommand({"addShard":"shard003/192.168.1.7:27017,192.168.1.8:27017,192.168.1.9:27017"});

七、指定库集合分片

mongos>use admin;

mongos>sh.enableSharding("dbname") 或 db.adminCommand({"enableSharding":"dbname"});

mongos>use dbname;

mongos>db.collectionName.ensureIndex({Date:1});

mongos>use admin;

mongos>sh.shardCollection("dbname.collectionName"，{Date:1});

八、验证分片

sh.status();

九、设置Balancer时间窗口

查看均衡器在哪个机器则：

mongos>use config

mongos>db.locks.findOne({"_id":"balancer"});

启动均衡器

mongos>use config

mongos>sh.setBalancerState(true);

或

configsvr>use admin

configsvr>db.settings.update({_id:"balancer"},{$set:{stopped:false}},{upsert:true})

关闭均衡器

mongos>sh.setBalancerState(false);

或

mongos>sh.stopBalancer()

或

configsvr>use admin

configsvr>db.settings.update({_id:"balancer"},{$set:{stopped:true}},{upsert:true});

设置时间窗口

mongos>db.settings.update({"_id":"balancer"},{$set:{activeWindow:{start:"23:00",stop:"8:00"}}},true);

均衡器只是用块的数量来，非数据的大小，作为衡量分片间是否均衡的指标。

在开机服务中加入以上相关服务.例如

vim /etc/rc.local

runuser -c "/opt/mongo/bin/mongod -f /opt/mongo/conf/mongod.conf" mond #启动mongod

runuser -c "/opt/sharding/mongo-conf/bim/mongod -f /opt/sharding/mongo-conf/conf/mongod.conf" mongod

runuser -c "/opt/sharding/mongo-mongos/bim/mongod -f /opt/sharding/mongo-mongos/conf/mongod.conf" mongod

分片中的不同复制集的端口可以不唯一；即可以使用不同的端口

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