MongoDB实现复制集

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下载MongoDB
MongoDB的官网是：http://www.mongodb.org/
MongoDB最新版本下载路径：https://www.mongodb.com/download-center
此次安装选择的版本是：mongodb-linux-x86_64-3.2.8.tgz
MongoDB安装

$ tar zxf mongodb-linux-x86_64-3.2.8.tgz -C /opt/modules/
$ ln -s mongodb-linux-x86_64-3.2.8/ mongodb

复制集节点架构

创建复制集
采用一台主机中实例四个节点arbiter, passive, primary, secondary（表：配置复制集）:

启动服务器成员

$ cd /opt/modules/mongodb/
$ mkdir -p /opt/datas/mongodb/replication/passive/data
$ mkdir -p /opt/datas/mongodb/replication/passive/logs
$ touch /opt/datas/mongodb/replication/passive/logs/passive.log
$ mkdir -p /opt/datas/mongodb/replication/primary/data
$ mkdir -p /opt/datas/mongodb/replication/primary/logs
$ touch /opt/datas/mongodb/replication/primary/logs/primary.log
$ mkdir -p /opt/datas/mongodb/replication/secondary/data
$ mkdir -p /opt/datas/mongodb/replication/secondary/logs
$ touch /opt/datas/mongodb/replication/secondary/logs/secondary.log
$ bin/mongod --dbpath /opt/datas/mongodb/replication/primary/data --port 27021 --replSet iotset --fork --logpath /opt/datas/mongodb/replication/primary/logs/primary.log
$ bin/mongod --dbpath /opt/datas/mongodb/replication/secondary/data --port 27022 --replSet iotset --fork --logpath /opt/datas/mongodb/replication/secondary/logs/secondary.log
$ bin/mongod --dbpath /opt/datas/mongodb/replication/passive/data --port 27023 --replSet iotset --fork --logpath /opt/datas/mongodb/replication/passive/logs/passive.log

初始化集群

$ bin/mongo [hostname]:27021
> rs.initiate()

最后检查服务器状态

> rs.status()

向复制集添加服务器

$ bin/mongo [hostname]:27021
> rs.add("[hostname]:27021")
> rs.add("[hostname]:27022")
> rs.add("[hostname]:27023")

最后检查服务器状态

> rs.status()

接下来修改服务器配置

> conf = rs.conf()
> conf.members[2].hidden = true
> conf.members[2].priority = 0

执行存储配置文档命令查看配置文档

> conf

更新复制集的配置

> rs.reconfig(conf)

查看新的复制集配置是否生效

> rs.conf()

向复制集添加仲裁服务器

$ mkdir -p /opt/datas/mongodb/replication/arbiter/data
$ mkdir -p /opt/datas/mongodb/replication/arbiter/logs
$ touch /opt/datas/mongodb/replication/arbiter/logs/arbiter.log
$ bin/mongod --dbpath /opt/datas/mongodb/replication/arbiter/data --port 27024 --replSet iotset --fork --logpath /opt/datas/mongodb/replication/arbiter/logs/arbiter.log -rest

添加仲裁服务器到复制集

> rs.addArb("[hostname]:27024")

查看添加结果

> rs.status()

因复制集节点需要保持奇数，从投票成员中停止被动服务器投票功能。

> conf = rs.conf()
> conf.members[2].votes = 0
> rs.reconfig(conf)

复制集链
检测实例状态

> rs.status()

强制进行新的选举

> rs.stepDown()

判断某个成员是否为主服务器

> db.isMaster()

修改节点数据同步来源

$ bin/mongo [hostname]:27023
> db.adminCommand({replSetSyncFrom:"[hostname]:27022"})

参考资料
MongoDB大数据处理权威指南（第二版）