node.js - MongoDB 数据库连接错误 - Docker Compose

Question

我已经构建了一个客户端服务器应用程序，并使用 MongoDB 作为我的数据库。

我想使用 docker-compose，但是在 docker-compose up 后出现数据库连接错误

我的应用程序结构如下所示

• 距离
  • 客户端
  • 服务器
• Dockerfile
• docker-compose.yml
• package.json

Dockerfile

# Create image based on the official Node 10 image from dockerhub
FROM node:10

# Create a directory where our app will be placed
RUN mkdir -p /app

# Change directory so that our commands run inside this new directory
WORKDIR /app

# Copy dependency definitions
COPY package*.json /app/

# Install dependecies
RUN npm install

# Get all the code needed to run the app
COPY . /app/

# Expose the port the app runs in
EXPOSE 8000

# Serve the app
CMD ["npm", "run", "start:prod"]

docker.compose.yml

version: '2' # specify docker-compose version

# Define the services/containers to be run
services:
  angular: # name of the first service
    build: ./ # specify the directory of the Dockerfile
    ports:
      - "8000:8000" # specify port forwarding
    links:
      - database # link this service to the database service
  database: # name of the third service
    restart: always
    image: mongo # specify image to build container from
    container_name: mongo
    ports:
      - "27017:27017" # specify port forewarding

数据库

import * as mongoose from 'mongoose';

const server = 'database:27017'; // REPLACE WITH YOUR DB SERVER
const database = 'twitter';

export class Database {
  constructor() {}

  static connect() {
    mongoose.connect(`mongodb://${server}/${database}`, {
      useCreateIndex: true,
      useNewUrlParser: true
    }).then(() => {
        console.log('Database connection successful');
      })
      .catch(err => {
        console.error('Database connection error');
      });
  }
}

这里我将主机设置为databse而不是localhost

服务器

import * as express from 'express';
import * as bodyParser from 'body-parser';
import * as path from 'path';
import * as cors from 'cors';
import { Routes } from './routes/twitter';


class App {

  public app: express.Application;
  public route: Routes = new Routes();

  constructor() {
    this.app = express();
    this.config();
    this.route.routes(this.app);
  }

  private config(): void {
    this.app.use(cors());
    this.app.use(bodyParser.json());
    this.app.use(bodyParser.urlencoded({ extended: false }));

    if (this.app.get('env') === 'production') {
      // loading the angular client folder or application
      this.app.use(express.static(path.join(__dirname, '/../client')));
    }
  }

}

export default new App().app;

命令

docker-compose up

package.json 脚本

  "scripts": {
    "ng": "ng",
    "start": "concurrently --kill-others \"npm run server:run\" \"ng serve --proxy-config proxy.conf.json\"",
    "server:run": "tsc -p ./server && concurrently \"tsc -w -p ./server\" \"nodemon dist/server/server.js\" ",
    "build": "ng build --prod --output-path=dist/client && npm run server:build",
    "server:build": "tsc -p ./server",
    "copyfiles": "cp -R ai dist/server/routes",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "start:prod": "NODE_ENV=production node dist/server/server.js"
  },

应用程序正在 localhost:8000 下运行客户端工作正常，但由于数据库连接错误，无法访问后端

在浏览器中我收到以下错误:

Failed to load resource: the server responded with a status of 404 (Not Found)

在我的控制台上我刚刚

angular_1 | angular_1 | > proto@0.0.0 start:prod /app angular_1
| > NODE_ENV=production node dist/server/server.js angular_1 | angular_1 | Express server listening on port 8000 angular_1 | Database connection error

Answer 1

我认为您的数据库 URL 不正确，因为 const server = 'database:27017'; 未从容器内部解析。当您使用 docker-compose 时，容器构建在默认网络上，因此您可以从 container_name 访问服务:如果您的 mongo 容器名为“mongo_db”，则在必须与 db 通信的服务中，url const server = 'mongo_db:27017';。

PS。然而，我总是建议使用 ENV 变量，这样你就可以从外部设置这些东西，