MongoDB第二话 -- MongoDB高可用集群实现

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本文主要记录MongoDB集群的搭建

坏境准备：liunx centos7，docker-compose，镜像mongo:4.2.21。 一主一从一仲裁，在一台机实现了

项目Value
0.221:27017节点1
0.221:27018节点2
0.221:27019仲裁节点

1. docker-compose.yaml

version: '3.7'
services:
  mongo01:
    image: mongo:4.2.21
    container_name: mongo01
    ports:
    - "27017:27017"
    environment:
    - TZ=Asia/Shanghai
    volumes:
    - ./rs1:/data/db
    #--replSet newset 定义副本集名称 可在路径后面使用?replicaSet=newset
    command: mongod --dbpath /data/db --replSet newset --oplogSize 128
    networks:
    - my-net
  mongo02:
    image: mongo:4.2.21
    container_name: mongo02
    ports:
    - "27018:27017"
    environment:
    - TZ=Asia/Shanghai
    volumes:
    - ./rs2:/data/db
    command: mongod --dbpath /data/db --replSet newset  --oplogSize 128
    networks:
    - my-net
  myarbiter:
    image: mongo:4.2.21
    container_name: myarbiter
    ports:
    - "27019:27017"
    environment:
    - TZ=Asia/Shanghai
    volumes:
    - ./rs3:/data/db
    command: mongod --dbpath /data/db --replSet newset  --oplogSize 128
    networks:
    - my-net
  mongo-console:
    image: mongo-express
    container_name: mongo-console
    ports:
    - "8081:8081"
    environment:
    #控制台 需要集群生效后才能连接成功 只能连接master 可单独抽离出来
    - ME_CONFIG_MONGODB_SERVER=mongo01
#    - ME_CONFIG_BASICAUTH_USERNAME=admin
#    - ME_CONFIG_BASICAUTH_PASSWORD=admin
    - TZ=Asia/Shanghai
    networks:
    - my-net
networks:
  #新增的网络 内部服务名调用
  my-net:
    external: true

2.启动容器

[root@m mongo-cluster]# docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                      NAMES
7588aac35621        mongo:4.2.21        "docker-entrypoint.s…"   15 minutes ago      Up 8 minutes        0.0.0.0:27017->27017/tcp   mongo01
5adca1bbfa3d        mongo:4.2.21        "docker-entrypoint.s…"   15 minutes ago      Up 15 minutes       0.0.0.0:27019->27017/tcp   myarbiter
5384dac6d37a        mongo:4.2.21        "docker-entrypoint.s…"   15 minutes ago      Up 15 minutes       0.0.0.0:27018->27017/tcp   mongo02
5df1b5d9af4f        mongo-express       "tini -- /docker-ent…"   15 minutes ago      Up 8 minutes        0.0.0.0:8081->8081/tcp     mongo-console

3.初始化集群

#进入任意一个容器内部 执行mongo命令
[root@m mongo-cluster]# docker exec -it mongo02 mongo
MongoDB shell version v4.2.21
#执行集群初始配置,如果需要程序连接，需要填宿主机IP
>rs.initiate({_id:"newset",members:[{_id:0,host:"192.168.0.221:27017"},{_id:1,host:"192.168.0.221:27018"},{_id:2,host:"192.168.0.221:27019",arbiterOnly:true}]})
{
 "operationTime" : Timestamp(1656417751, 1),
 "ok" : 0,
 "errmsg" : "already initialized",
 "code" : 23,
 "codeName" : "AlreadyInitialized",
 "$clusterTime" : {
  "clusterTime" : Timestamp(1656417751, 1),
  "signature" : {
   "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
   "keyId" : NumberLong(0)
  }
 }
}
newset:SECONDARY>

_id：对应的replSet 名称 host：如果需要程序连接，需要填宿主机IP arbiterOnly:true 表示该节点为仲裁节点

4.查看集群状态

newset:SECONDARY> rs.status()
#找到members节点信息
"members" : [
  {
   "_id" : 0,
   "name" : "192.168.0.221:27017",
   "health" : 1,
   "state" : 1,
   #集群master
   "stateStr" : "PRIMARY",
   "uptime" : 202,
   "optime" : {
    "ts" : Timestamp(1656417761, 6),
    "t" : NumberLong(1)
   },
   "optimeDate" : ISODate("2022-06-28T12:02:41Z"),
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "could not find member to sync from",
   "electionTime" : Timestamp(1656417761, 1),
   "electionDate" : ISODate("2022-06-28T12:02:41Z"),
   "configVersion" : 1,
   "self" : true,
   "lastHeartbeatMessage" : ""
  },
  {
   "_id" : 1,
   "name" : "192.168.0.221:27018",
   "health" : 1,
   "state" : 2,
   #集群slave
   "stateStr" : "SECONDARY",
   "uptime" : 10,
   "optime" : {
    "ts" : Timestamp(1656417751, 1),
    "t" : NumberLong(-1)
   },
   "optimeDurable" : {
    "ts" : Timestamp(1656417751, 1),
    "t" : NumberLong(-1)
   },
   "optimeDate" : ISODate("2022-06-28T12:02:31Z"),
   "optimeDurableDate" : ISODate("2022-06-28T12:02:31Z"),
   "lastHeartbeat" : ISODate("2022-06-28T12:02:41.778Z"),
   "lastHeartbeatRecv" : ISODate("2022-06-28T12:02:41.434Z"),
   "pingMs" : NumberLong(0),
   "lastHeartbeatMessage" : "",
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "",
   "configVersion" : 1
  },
  {
   "_id" : 2,
   "name" : "192.168.0.221:27019",
   "health" : 1,
   "state" : 7,
   #集群仲裁
   "stateStr" : "ARBITER",
   "uptime" : 10,
   "lastHeartbeat" : ISODate("2022-06-28T12:02:41.778Z"),
   "lastHeartbeatRecv" : ISODate("2022-06-28T12:02:41.704Z"),
   "pingMs" : NumberLong(0),
   "lastHeartbeatMessage" : "",
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "",
   "configVersion" : 1
  }
 ],

5.模拟master节点挂掉

停掉master节点，进入slave节点容器中查看状态

"members" : [
  {
   "_id" : 0,
   "name" : "192.168.0.221:27017",
   "health" : 0,
   "state" : 8,
   "stateStr" : "(not reachable/healthy)",
   "uptime" : 0,
   "optime" : {
    "ts" : Timestamp(0, 0),
    "t" : NumberLong(-1)
   },
   "optimeDurable" : {
    "ts" : Timestamp(0, 0),
    "t" : NumberLong(-1)
   },
   "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
   "optimeDurableDate" : ISODate("1970-01-01T00:00:00Z"),
   "lastHeartbeat" : ISODate("2022-06-28T12:05:49.005Z"),
   "lastHeartbeatRecv" : ISODate("2022-06-28T12:05:30.416Z"),
   "pingMs" : NumberLong(0),
   "lastHeartbeatMessage" : "Error connecting to 192.168.0.221:27017 :: caused by :: Connection refused",
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "",
   "configVersion" : -1
  },
  {
   "_id" : 1,
   "name" : "192.168.0.221:27018",
   "health" : 1,
   "state" : 1,
   #原来的slave节点已经变更为master了
   "stateStr" : "PRIMARY",
   "uptime" : 390,
   "optime" : {
    "ts" : Timestamp(1656417940, 2),
    "t" : NumberLong(3)
   },
   "optimeDate" : ISODate("2022-06-28T12:05:40Z"),
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "could not find member to sync from",
   "electionTime" : Timestamp(1656417940, 1),
   "electionDate" : ISODate("2022-06-28T12:05:40Z"),
   "configVersion" : 1,
   "self" : true,
   "lastHeartbeatMessage" : ""
  },
  {
   "_id" : 2,
   "name" : "192.168.0.221:27019",
   "health" : 1,
   "state" : 7,
   "stateStr" : "ARBITER",
   "uptime" : 197,
   "lastHeartbeat" : ISODate("2022-06-28T12:05:49.006Z"),
   "lastHeartbeatRecv" : ISODate("2022-06-28T12:05:48.204Z"),
   "pingMs" : NumberLong(0),
   "lastHeartbeatMessage" : "",
   "syncingTo" : "",
   "syncSourceHost" : "",
   "syncSourceId" : -1,
   "infoMessage" : "",
   "configVersion" : 1
  }
 ],

可以看到原来的slave节点已经变成了PRIMARY主节点

6.mongo-express控制台

  1. 连接需要注意的点
    environment:
    #不用带端口 直接走容器名称
    - ME_CONFIG_MONGODB_SERVER=mongo01
  1. 集群未初始化或者集群master已变更，控制台会报下面错误
(node:6) UnhandledPromiseRejectionWarning: MongoError: not master and slaveOk=false

需要确定master节点后然后重启控制台

7.springboot中集群配置

spring:
  data:
    mongodb:
      #有密码连接 账号密码包含特殊字符的需要用URLEncoder编码 库名必填
      #uri: mongodb://admin:123456@192.168.0.221:27017/imgdb
      #集群方式 副本集replicaSet可带可不带
      uri: mongodb://192.168.0.221:27017,192.168.0.221:27018/imgdb?replicaSet=newset
#      uri: mongodb://192.168.0.221:27017/imgdb

以上就是本章的全部内容了。

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