• 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

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！
 
   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"
   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
sudo tee /etc/docker/daemon.json <<-'EOF'
  "registry-mirrors": ["https://7fsjirqs.mirror.aliyuncs.com"]
sudo systemctl daemon-reload
sudo systemctl restart docker
验证Docker的镜像加速是否生效
[root@
				
docker使用mongo 为什么需要这个？ (Why you need this?)
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根据 freecodecamp 中ZhichengChen写的文章的学习整理（https://chinese.freecodecamp.org/news/the-docker-handbook/）
Docker简介
容器化可以将软件及其所有依赖项打包在一个自包含的软件包中，这样就可以省略麻烦的配置，直接运行。
Docker核心概念：镜像是一个只读的模板，类似于安装系统时用到的ISO文件，通过镜像来完成各种应用的部署。容器可以被启动、开始、停止、删除等，每个容器间都是相互隔离的。仓库是一个存放镜像的场所，仓库
1.1 Docker 概念
Docker 于 2013 年开源，其基于 go 语言开发，是一个开源的 PaaS 服务(Platform
as a Service，平台即服务的缩写)。而 go 语言由 google 开发，docker 公司最早期
叫 dotCloud。Docker 开源后广受欢迎，于是公司改名为 Docker Inc，总部位于美国
加州旧金山，Docker ...
				解决：consumer: Cannot connect to amqp://admin:**@127.0.0.1:5672//: [Errno 111] Connection refused.