Mongo数据库在使用docker时断开连接

提姆哈朱

我在我的应用程序中使用 docker compose 并尝试将 mongodb 连接到服务器。当我在 docker 之外本地运行我的应用程序时，我将其作为输出（按预期工作）

[nodemon] 2.0.15
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,json
[nodemon] starting `node index.js`
Server running
Mongoose connected to db...
Mongodb connected....

当我运行docker-compose up命令并且服务器在容器中运行时，我得到了这个输出

[nodemon] 2.0.15
docker-server  | [nodemon] to restart at any time, enter `rs`
docker-server  | [nodemon] watching path(s): *.*
docker-server  | [nodemon] watching extensions: js,mjs,json
docker-server  | [nodemon] starting `node index.js`
docker-server  | Works
docker-server  | Works
docker-server  | Mongoose connection is disconnected...

过了一会儿，猫鼬断开了连接。

我的package.json是

{
  "name": "make-me-a-sandwich",
  "version": "1.1.0",
  "description": "This is the Swagger 2.0 API for Web Architectures course group project work.        ",
  "main": "index.js",
  "scripts": {
    "prestart": "npm install",
    "start": "nodemon index.js"
  },
  "keywords": [
    "swagger"
  ],
  "license": "Unlicense",
  "private": true,
  "dependencies": {
    "connect": "^3.2.0",
    "js-yaml": "^3.3.0",
    "swagger-tools": "0.10.1",
    "mongoose": "^6.1.5",
    "nodemon": "^2.0.15"
}

}

我的index.js文件是

const http = require('http');
const connect = require('./models/db');

const PORT = 80;
const server = http.createServer(function (request, response) {

const { url, method, headers } = request;
const filePath = new URL(url, `http://${headers.host}`).pathname;

if (filePath === '/' && method.toUpperCase() === 'GET') {
    console.log("Works")
    response.statusCode = 200;
    response.setHeader('Content-Type', 'text/plain');
    response.end('Hello, World! GET\n');
} else {
    response.statusCode = 200;
    response.setHeader('Content-Type', 'text/plain');
    response.end('Hello, World! Teemu\n');
}

});

server.on('error', err => {
   console.error(err);
   server.close();
});

server.on('close', () => console.log('Server closed.'));

server.listen(PORT, () => {
    console.log("Server running");
});
connect.connectDB();

模型/db.js

const mongoose = require('mongoose');

function connectDB() {
   mongoose
       .connect('mongodb://mongo_db:27017', {
           useNewUrlParser: true,
       })
       .then(() => {
           console.log('Mongodb connected....');
       })
       .catch(err => console.log(err.message));

   mongoose.connection.on('connected', () => {
       console.log('Mongoose connected to db...');
   });

   mongoose.connection.on('error', err => {
       console.log(err.message);
   });

   mongoose.connection.on('disconnected', () => {
       console.log('Mongoose connection is disconnected...');
   });
};
function disconnectDB() {
    mongoose.disconnect();
}

module.exports = { connectDB, disconnectDB };

Dockerfile

FROM node:17.3.0

WORKDIR /server

COPY package.json .

RUN npm install

COPY . .

EXPOSE 80

CMD ["npm", "start"]

码头工人撰写文件

version: "3"

services:
  server-a:
    container_name: docker-server
    build:
      dockerfile: Dockerfile
      context:  ./backend/server-a
    ports:
      - "3000:80"
    links: 
      - mongo_db
    networks:
      - backend
  mongo_db:
    container_name: mongo
    image: mongo:latest
    ports:
      - '27017:27017'
networks:
  backend:

帮助将不胜感激。如果我可以提供任何其他信息，请告诉我。

大卫迷宫

不同的容器需要在同一个 Compose 网络上进行通信。如果服务没有networks:块，Compose 会自动将其附加到default网络。因此，在您的示例中，server-a容器仅在backend网络上，但mongo_db容器仅在default网络上，这就是它们无法通信的原因。

解决此问题的最简单方法是删除文件中的所有networks:块。然后 Compose 会将所有容器附加到default网络。删除其他不必要的选项，您可以将此 Compose 文件缩减为

version: "3.8"
services:
  server-a:
    build: ./backend/server-a
    ports:
      - "3000:80"
  mongo_db:
    image: mongo:latest
    ports:
      - '27017:27017'

在评论中，您建议保留第二个命名网络很重要。如果是这种情况，那么您需要确保数据库容器也有一个networks:块，该块命名与应用程序容器相同的网络。

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