Docker Mongo副本集部署

Docker 部署方式

1. 拉取镜像

   docker pull mongo:3.2
   

2. 配置mongo 启动参数

   • 在宿主机上创建 /opt/mongo/data 和 /opt/mongo/conf 目录

   • 在/opt/mongo/conf 目录下新建 mongo.yaml 配置文件

     storage:
         dbPath: /data/db
         engine: wiredTiger
         wiredTiger:
           engineConfig:
              cacheSizeGB: 1
     replication:
        replSetName: rs
        oplogSizeMB: 100
     security:
        keyFile: /data/configdb/authkey
        authorization: disabled
        clusterAuthMode: keyFile
     
     

   • 在/opt/mongo/conf 目录下新建 authKey 文件(后面/opt/mongo/conf会挂载到容器的 /data/configdb)

     openssl rand -base64 666 > /opt/mongo/conf/authkey
     chmod 600 /opt/mongo/conf/authkey
     

3. 将这几个配置文件同步到几台节点上

4. 以非验证方式启动(为了可以创建用户),将上面的 security 注释掉

   docker run --name mongo -p 27017:27017 -v /opt/mongo/conf:/data/configdb -v /opt/mongo/data:/data/db -d mongo:3.2 -f /data/configdb/mongo.yaml
   

   -f 是指定相关的配置文件

   在几台服务器都启动对应的Mongo站点

   通过 docker logs mongo 查看日志输出

   到此Mongo已经启动了

   但并不是以副本集方式进行通信的

5. 初始化Mongo副本集

   登录以上任意一台副本集，执行初始化

   var config={
        _id:"rs",
        members:[
            {_id:0,host:"192.168.136.129:27017"},
            {_id:1,host:"192.168.136.129:27018"}
   ]};
   rs.initiate(config);
   

   同时查看 rs.status(),可以看到 已经有两台服务器加入其中了

   { 
       "set" : "rs", 
       "date" : ISODate("2021-08-19T04:26:34.875+0000"), 
       "myState" : NumberInt(1), 
       "term" : NumberLong(1), 
       "heartbeatIntervalMillis" : NumberLong(2000), 
       "members" : [
           {
               "_id" : NumberInt(0), 
               "name" : "192.168.136.129:27017", 
               "health" : NumberInt(1), 
               "state" : NumberInt(1), 
               "stateStr" : "PRIMARY", 
               "uptime" : NumberInt(78), 
               "optime" : {
                   "ts" : Timestamp(1629347194, 1), 
                   "t" : NumberLong(1)
               }, 
               "optimeDate" : ISODate("2021-08-19T04:26:34.000+0000"), 
               "infoMessage" : "could not find member to sync from", 
               "electionTime" : Timestamp(1629347193, 1), 
               "electionDate" : ISODate("2021-08-19T04:26:33.000+0000"), 
               "configVersion" : NumberInt(1), 
               "self" : true
           }, 
           {
               "_id" : NumberInt(1), 
               "name" : "192.168.136.129:27018", 
               "health" : NumberInt(1), 
               "state" : NumberInt(2), 
               "stateStr" : "SECONDARY", 
               "uptime" : NumberInt(11), 
               "optime" : {
                   "ts" : Timestamp(1629347183, 1), 
                   "t" : NumberLong(-1)
               }, 
               "optimeDate" : ISODate("2021-08-19T04:26:23.000+0000"), 
               "lastHeartbeat" : ISODate("2021-08-19T04:26:33.731+0000"), 
               "lastHeartbeatRecv" : ISODate("2021-08-19T04:26:31.490+0000"), 
               "pingMs" : NumberLong(0), 
               "configVersion" : NumberInt(1)
           }
       ], 
       "ok" : NumberInt(1)
   }
   

   但此时，如果Primary 挂掉了，另一台并不会升级成 Primary,因为少一台仲裁的节点

6. 在增加仲裁节点前，先创建一个root用户，便于后面开启mongo的鉴权（连接副本集）

   db.createUser({ user: 'root', pwd: '123456', roles: [ { role: "root", db: "admin" } ] });
   

7. 创建好用户后，可以将节点配置文件中的 authkey 注释去掉

8. 启动mongo

9. 同样执行步骤4，创建一个mongo节点，执行以下方法增加 仲裁节点

   rs.addArb("192.168.136.129:27019")
   

   { 
       "set" : "rs", 
       "date" : ISODate("2021-08-19T05:01:36.773+0000"), 
       "myState" : NumberInt(1), 
       "term" : NumberLong(4), 
       "heartbeatIntervalMillis" : NumberLong(2000), 
       "members" : [
           {
               "_id" : NumberInt(0), 
               "name" : "192.168.136.129:27017", 
               "health" : NumberInt(1), 
               "state" : NumberInt(1),  
               "stateStr" : "PRIMARY", # 读写
               "uptime" : NumberInt(1142), 
               "optime" : {
                   "ts" : Timestamp(1629348176, 1), 
                   "t" : NumberLong(4)
               }, 
               "optimeDate" : ISODate("2021-08-19T04:42:56.000+0000"), 
               "electionTime" : Timestamp(1629348175, 1), 
               "electionDate" : ISODate("2021-08-19T04:42:55.000+0000"), 
               "configVersion" : NumberInt(2), 
               "self" : true
           }, 
           {
               "_id" : NumberInt(1), 
               "name" : "192.168.136.129:27018", 
               "health" : NumberInt(1), 
               "state" : NumberInt(2), 
               "stateStr" : "SECONDARY",  # 只读
               "uptime" : NumberInt(1103), 
               "optime" : {
                   "ts" : Timestamp(1629348176, 1), 
                   "t" : NumberLong(4)
               }, 
               "optimeDate" : ISODate("2021-08-19T04:42:56.000+0000"), 
               "lastHeartbeat" : ISODate("2021-08-19T05:01:35.180+0000"), 
               "lastHeartbeatRecv" : ISODate("2021-08-19T05:01:35.281+0000"), 
               "pingMs" : NumberLong(0), 
               "syncingTo" : "192.168.136.129:27017", 
               "configVersion" : NumberInt(2)
           }, 
           {
               "_id" : NumberInt(2), 
               "name" : "192.168.136.129:27019", 
               "health" : NumberInt(1), 
               "state" : NumberInt(7), 
               "stateStr" : "ARBITER", # 仲裁节点
               "uptime" : NumberInt(1141), 
               "lastHeartbeat" : ISODate("2021-08-19T05:01:35.180+0000"), 
               "lastHeartbeatRecv" : ISODate("2021-08-19T05:01:35.838+0000"), 
               "pingMs" : NumberLong(0), 
               "configVersion" : NumberInt(2)
           }
       ], 
       "ok" : NumberInt(1)
   }
   

10. 这时，如果master 节点掉线了，仲裁节点会进行选举

Docker-compose 方式

version: "3"

services:
   mongo_master_service:
       image: mongo:3.2
       networks:
         mongo_service_net:
       ports:
        - "27017:27017"
       volumes:
         - /opt/mongo/conf:/data/configdb
         - /opt/mongo/data:/data/db
       command: mongod -f /data/configdb/mongo.yaml
   mongo_secondary_service:
       image: mongo:3.2
       networks: 
         mongo_service_net:
       ports:
         - "27018:27017"
       volumes:
         - /opt/mongo1/conf:/data/configdb
         - /opt/mongo1/data:/data/db
       command: mongod -f /data/configdb/mongo.yaml
   mongo_arbt_service:
       image: mongo:3.2
       networks: 
         mongo_service_net:
       ports:
         - "27019:27017"
       volumes:
         - /opt/mongo2/conf:/data/configdb
         - /opt/mongo2/data:/data/db
       command: mongod -f /data/configdb/mongo.yaml
networks:
    mongo_service_net:
     ipam:
       driver: default

docker-compose up -d