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(学习自黑马)

下载对应linux版本MongoDB

源码下载地址：https://www.mongodb.com/download-center#community

目前在一台服务器开三个端口模拟三个mongodb,

配置一个主节点27017,

一个从节点27018,

一个仲裁者27019

配置主节点,副节点,仲裁节点

(下面的创建文件一共有三份,通过不同的端口号实现 , 将配置文件的端口修改成对应节点端口即可,注意路径也要跟着修改)

#创建文件log日志文件data数据文件 conf配置文件

mkdir -p /mongodb/replica_sets/myrs_{端口号}/log \ &
mkdir -p /mongodb/replica_sets/myrs_{端口号}/data/db
vim /mongodb/replica_sets/myrs_{端口号}/mongod.conf

mongod.conf文件内容

systemLog:destination: filepath: "/mongodb/replica_sets/myrs_{端口号}/log/mongod.log"logAppend: true
storage:dbPath: "/mongodb/replica_sets/myrs_{端口号}/data/db"journal:#启用或禁用持久性日志以确保数据文件保持有效和可恢复。enabled: true
processManagement:#启用在后台运行mongos或mongod进程的守护进程模式。fork: true#指定用于保存mongos或mongod进程的进程ID的文件位置，其中mongos或mongod将写入其PIDpidFilePath: "/mongodb/replica_sets/myrs_{端口号}/log/mongod.pid"
net:#服务实例绑定所有IP，有副作用，副本集初始化的时候，节点名字会自动设置为本地域名，而不是ip#bindIpAll: true#服务实例绑定的IP 本机ipbindIp: localhost,192.168.0.252  #bindIp#绑定的端口port: {端口号}
replication:#副本集的名称replSetName: myrs

启动mongodb: (三个都要启动)

/{你上传的mongodb路径}/mongod -f 
/mongodb/replica_sets/myrs_{端口号}/mongod.conf

查看启动状态 出现三个服务代表启动成功

ps -ef | grep 'mongo'[root@CentOS7 ~]# ps -ef | grep 'mongo'
root     27598     1  0 10:15 ?        00:00:17 /application/mongoBD/mongodb/bin/mongod -f /mongodb/replica_sets/myrs_27017/mongod.conf
root     29589     1  0 10:59 ?        00:00:06 /application/mongoBD/mongodb/bin/mongod -f /mongodb/replica_sets/myrs_27018/mongod.conf
root     30045     1  0 11:08 ?        00:00:04 /application/mongoBD/mongodb/bin/mongod -f /mongodb/replica_sets/myrs_27019/mongod.conf

进入主节点,这时使用show dbs命令会报错需要执行初始化副本集

rs.initiate()

执行完成后, show dbs 命令成功

添加从节点

rs.add("192.168.0.252:27018")

查看状态

rs.status()

members里面即为集群配置

"members" : [{"_id" : 0,"name" : "192.168.0.252:27017","health" : 1,"state" : 1,"stateStr" : "PRIMARY","uptime" : 4840,"optime" : {"ts" : Timestamp(1678332988, 1),"t" : NumberLong(1)},"optimeDate" : ISODate("2023-03-09T03:36:28Z"),"syncingTo" : "","syncSourceHost" : "","syncSourceId" : -1,"infoMessage" : "","electionTime" : Timestamp(1678331608, 1),"electionDate" : ISODate("2023-03-09T03:13:28Z"),"configVersion" : 2,"self" : true,"lastHeartbeatMessage" : ""},{"_id" : 1,"name" : "192.168.0.252:27018","health" : 1,"state" : 2,"stateStr" : "SECONDARY","uptime" : 40,"optime" : {"ts" : Timestamp(1678332988, 1),"t" : NumberLong(1)},"optimeDurable" : {"ts" : Timestamp(1678332988, 1),"t" : NumberLong(1)},"optimeDate" : ISODate("2023-03-09T03:36:28Z"),"optimeDurableDate" : ISODate("2023-03-09T03:36:28Z"),"lastHeartbeat" : ISODate("2023-03-09T03:36:34.887Z"),"lastHeartbeatRecv" : ISODate("2023-03-09T03:36:34.099Z"),"pingMs" : NumberLong(0),"lastHeartbeatMessage" : "","syncingTo" : "192.168.0.252:27017","syncSourceHost" : "192.168.0.252:27017","syncSourceId" : 0,"infoMessage" : "","configVersion" : 2}]

添加仲裁节点

rs.addArb("192.168.0.252:27019") 

此时在查看状态members里面会多出仲裁节点

登录从节点

/{路径}/bin/mongo --host 192.168.0.252 --port=27018

此时使用show dbs报错

设置为从节点

rs.slaveOk()

此时使用show dbs 成功 现在可实现了读写分离，让主插入数据，让从来读取数据

登录仲裁者节点

/{路径}/bin/mongo --host 192.168.0.252 --port=27019

设置为仲裁节点

rs.slaveOk()

完成