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MongoDB第二话 -- MongoDB高可用集群实现

2022-07-01 14:43:00 【有头发的程序猿!】

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

[[email protected] 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
[[email protected] 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:[email protected]: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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版权声明
本文为[有头发的程序猿!]所创，转载请带上原文链接，感谢
https://blog.csdn.net/qq_35551875/article/details/125429009

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