烧脑：docker多容器中的mongodb多个连接可行吗

最新推荐文章于 2025-05-07 16:29:26 发布

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最新推荐文章于 2025-05-07 16:29:26 发布

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本文链接：https://blog.youkuaiyun.com/SS78088SS/article/details/128783969

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本文介绍如何在Docker环境中通过代码连接已运行的MongoDB容器，并确保正常的数据交互。使用mongoose库实现与MongoDB的服务连接，通过指定正确的连接字符串确保不同容器间能够正确通信。

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https://www.liuya.love/article?name=docker%E5%AE%B9%E5%99%A8%E9%97%B4%E7%9A%84%E9%80%9A%E4%BF%A1%E3%80%90%E8%BF%9E%E6%8E%A5MongoDB%E6%95%B0%E6%8D%AE%E5%BA%93%E3%80%91&id=62ea2149ff3382e9054dbdf6
参考了这位大神的博客

问题：若mongodb容器已运行的情况下，还可以再在代码中连接吗？如何做呢？

背景：三个容器环境，分别是 node ,mongodb,mongodb-express

需求：mongo容器已启动成功，而代码中需要再次连接mongoDB以操作数据库

工具库：mogoose

解决步骤

const mongoose = require('mongoose')
// 为什么这里是@mongodb?? 请重点思考
const URI="mongodb://admin:admin@mongodb:27017/"

mongoose.connect(URI , { useNewUrlParser : true, useUnifiedTopology : true})

mongoose.connection.on("connected",function(){
  console.log(URI+'：数据库连接成功！')
})

启动容器，输出连接成功

myexpress-node-web-1  | mongodb://admin:admin@mongodb:27017/：数据库连接成功！

原因反推

首先了解一下容器各自的IP情况，再用name或者ip来连接mongoDB的容器

docker network inspect mongodb_network

PS I:\Frontend> docker network inspect mongodb_network
[
    {
        "Name": "mongodb_network",
        "Id": "029276b94ec4bb67e63a45aaad79b96f6f5ddf031cffb7d7039f428ddb9d87c0",
        "Created": "2023-01-27T20:08:38.045814Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.19.0.0/16",
                    "Gateway": "172.19.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "0a0472e20bf61637744f4b09bff44211b25fde9dcb34dbb42ec291717868aa0b": {
                "Name": "mongo-express",
                "EndpointID": "1129e83db10d15ce31aa138a02eed885e2db9dfc0d1dfbef462ca40f98e08e47",
                "MacAddress": "02:42:ac:13:00:02",
                "IPv4Address": "172.19.0.2/16",
                "IPv6Address": ""
            },
            "f76f3d70730f4400b71fc60d126d1e053276c9153daf97b93e995e72c1b99524": {
                "Name": "mongodb",
                "EndpointID": "24988fa13701d7a64491a220337335d7f2ca2e9134eb1076f6e1f48b661cb3c6",
                "MacAddress": "02:42:ac:13:00:03",
                "IPv4Address": "172.19.0.3/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {
            "com.docker.compose.network": "default",
            "com.docker.compose.project": "myexpress",
            "com.docker.compose.version": "2.13.0"
        }
    }
]

总结

即使mongo容器已运行并正常访问，也可以再用代码连接到mongo容器,不会有影响

附赠docker-compse,可参考

version: '3.0'
services:
  node-web: 
    build: ./
    ports:
      - "3000:3000"
      - "3001:3001"
    volumes:
      - ./:/usr/src/app
      - /usr/src/app/node_modules/
    command:  npm start 

  mongodb:
    image: mongo
    container_name: mongodb
    ports:
      - 27017:27017
    expose:
      - 27017
    volumes:
      - ./database:/data/db
    environment:
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=admin
      
  mongo-express:
    image: mongo-express
    container_name: mongo-express
    restart: always
    ports:
      - 8081:8081
    environment:
      - ME_CONFIG_MONGODB_ADMINUSERNAME=admin
      - ME_CONFIG_MONGODB_ADMINPASSWORD=admin
      - ME_CONFIG_MONGODB_SERVER=mongodb
    depends_on:
      - mongodb

networks:
  default:
    name: mongodb_network