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mongodb 副本集群搭建

Posted on 2021-12-29 00:21  蒋翔  阅读(144)  评论(0)  编辑  收藏  举报

一 下载mongodb

https://www.mongodb.com/try/download/community?tck=docs_server
选择下载tar.gz包

  1. 直接解压
    tar -zxvf mongodb-linux-x86_64-rhel70-5.0.5.tgz
  2. 重命名文件夹
    mv mongodb-linux-x86_64-rhel70-5.0.5 mongodb
  3. 创建mongo 用户
    adduser mongodb
  4. 设置密码
    passwd mongodb
  5. 将mongodb 添加到mongodb分组
    usermod -G mongodb mongodb
  6. 可查看monongdb 的分组
    id mongodb
  7. 将mongo文件夹改为mongodb用户所有
    chown -R mongodb:mongodb ./mongo
  8. 设置环境变量
    vim /etc/profile
    9.在最底部输入如下(/opt/mongo/mongodb 为解压的路径)
    MONGODB_HOME=/opt/mongo/mongodb
    PATH=$PATH:$MONGODB_HOME/bin
  9. 使环境变量生效
    source /etc/profile
  10. 查看环境变量是否生效
    mongo -version
    显示如下
    MongoDB shell version v5.0.5
    Build Info: {
        "version": "5.0.5",
        "gitVersion": "d65fd89df3fc039b5c55933c0f71d647a54510ae",
        "openSSLVersion": "OpenSSL 1.0.1e-fips 11 Feb 2013",
        "modules": [],
        "allocator": "tcmalloc",
        "environment": {
            "distmod": "rhel70",
            "distarch": "x86_64",
            "target_arch": "x86_64"
        }
    }
  1. 切换mongodb用户
    su mongodb

二. 后面通过配置三个端口和不同文件夹模拟台电脑运行三个mongo

启动配置文档https://docs.mongodb.com/manual/administration/configuration/
13. 创建三个文件夹,使用三个不同端口
mkdir mongodb_27017 mongodb_27018 mongodb_27019
14. 每个文件夹创建 data logs 目录和mongo.yml配置文件
cd /opt/mongo/mongodb_27017
mkdir data logs
vi mongo.yml
输入

processManagement:
   fork: true
net:
   bindIp: 192.168.75.129
   port: 27017
storage:
   dbPath: /opt/mongo/mongodb_27017/data
systemLog:
   destination: file
   path: "/opt/mongo/mongodb_27017/logs/mongod.log"
   logAppend: true
storage:
   journal:
      enabled: true
replication:
   replSetName: mymongodb

启动 mongod -f mongo.yml
第二个文件夹
cd /opt/mongo/mongodb_27018
mkdir data logs
vi mongo.yml
输入

processManagement:
   fork: true
net:
   bindIp: 192.168.75.129
   port: 27018
storage:
   dbPath: /opt/mongo/mongodb_27018/data
systemLog:
   destination: file
   path: "/opt/mongo/mongodb_27018/logs/mongod.log"
   logAppend: true
storage:
   journal:
      enabled: true
replication:
   replSetName: mymongodb

启动 mongod -f mongo.yml
第三文件夹
cd /opt/mongo/mongodb_27019
mkdir data logs
vi mongo.yml
输入

processManagement:
   fork: true
net:
   bindIp: 192.168.75.129
   port: 27019
storage:
   dbPath: /opt/mongo/mongodb_27019/data
systemLog:
   destination: file
   path: "/opt/mongo/mongodb_27019/logs/mongod.log"
   logAppend: true
storage:
   journal:
      enabled: true
replication:
   replSetName: mymongodb

启动 mongod -f mongo.yml
15. 连接mongo
mongo --host=192.168.75.129:27017
输入初始化命令
rs.initiate()
输出

> rs.initiate()
{
	"info2" : "no configuration specified. Using a default configuration for the set",
	"me" : "192.168.75.129:27017",
	"ok" : 1
}
mymongodb:SECONDARY> 
mymongodb:PRIMARY>

16.添加从节点节点
mongo --host=192.168.75.129:27017
rs.add("192.168.75.129:27018")
17.添加仲裁节点(我的本地这种方式添加失败,可使用cf配置)
rs.addArb("192.168.75.129:27019")
18.配置从节点可以读取数据
mongo --host=192.168.75.129:27018
rs.slaveOk();
19. 也可以直接配置初始化副本集群
mongo --host=192.168.75.129:27018
通过上面命令连接后输入下面两条命令初始化副本集群

cfg={"_id":"mymongodb","members":[{"_id":1,"host":"192.168.75.129:27017"},{"_id":2,"host":"192.168.75.129:27018"},{"_id":3,"host":"192.168.75.129:27019","arbiterOnly":true}]}

rs.initiate(cfg)
显示如下标识成功

> rs.initiate(cfg)
{ "ok" : 1 }

19.修改设置优先级(先获取配置,将配置的第二个节点的优先权重改为2,再通过reconfig重新使配置生效)

var config = rs.config()
config.members[1].priority=2
rs.reconfig(config)