Docker Mongo副本集部署

2021-08-24 本文已影响0人 David_jim

Docker 部署方式

拉取镜像
```
docker pull mongo:3.2
```

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
```

将这几个配置文件同步到几台节点上
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

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

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" } ] });
```
创建好用户后，可以将节点配置文件中的 authkey 注释去掉
启动mongo

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)
}

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

Docker Mongo副本集部署

Docker 部署方式

Docker-compose 方式

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