Mongo資料庫在使用docker時斷開連接

我在我的應用程式中使用 docker compose 并嘗試將 mongodb 連接到服務器。當我在 docker 之外本地運行我的應用程式時，我將其作為輸出（按預期作業）

[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....

當我運行docker-compose up命令并且服務器在容器中運行時，我得到了這個輸出

[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...

過了一會兒，貓鼬斷開了連接。

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檔案是

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"]

碼頭工人撰寫檔案

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:

幫助將不勝感激。如果我可以提供任何其他資訊，請告訴我。

uj5u.com熱心網友回復：

不同的容器需要在同一個 Compose 網路上進行通信。如果服務沒有networks:塊，Compose 會自動將其附加到default網路。因此，在您的示例中，server-a容器僅在backend網路上，但mongo_db容器僅在default網路上，這就是它們無法通信的原因。

解決此問題的最簡單方法是洗掉檔案中的所有networks:塊。然后 Compose 會將所有容器附加到default網路。洗掉其他不必要的選項，您可以將此 Compose 檔案縮減為

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

在評論中，您建議保留第二個命名網路很重要。如果是這種情況，那么您需要確保資料庫容器也有一個networks:塊，該塊命名與應用程式容器相同的網路。

標籤：mongodb 码头工人

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