文件更改时，两个带有 Nodemon 的后端服务器不会在 docker 容器中重新加载

Posted 2023-03-08

【中文标题】文件更改时，两个带有 Nodemon 的后端服务器不会在 docker 容器中重新加载

【英文标题】：Two backend servers with Nodemon doesn't reload in docker container when files change

【发布时间】：2021-03-04 09:12:11

【问题描述】：

我开始学习 docker，但遇到了一个问题。我想运行 2 个容器，每个容器都将运行一个带有 nodemon 的快速服务器，但是当项目中发生更改时，nodemon 不会在容器中重新启动。当容器用完时，一切正常。

项目：

服务器/Dockerfile：

FROM node:alpine

WORKDIR /usr/server

COPY package*.json ./
RUN npm install

COPY . .

EXPOSE 4000

CMD ["npm", "start"];

任务/Dockerfile：

FROM node:alpine

WORKDIR /usr/tasks

COPY package*.json ./
RUN npm install

COPY . .

EXPOSE 3000

CMD ["npm", "start"];

服务器/package.json：

  "name": "server",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": 
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon index.js"
  ,
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": 
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "mongoose": "^5.10.15",
    "nodemon": "^2.0.6"
  

tasks/package.json:

  "name": "tasks",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": 
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon index.js"
  ,
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": 
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "mongoose": "^5.10.15",
    "nodemon": "^2.0.6"
  

docker-compose.yml:

version: "3"

services:
  tasks:
    container_name: tasks
    build:
      context: ./tasks
      dockerfile: Dockerfile
    command: npm start
    ports:
      - "3000:3000"
    networks:
      - app-network

  server:
    container_name: server
    build:
      context: ./server
      dockerfile: Dockerfile
    command: npm start
    ports:
      - "4000:4000"
    networks:
      - app-network

  mongo-express:
    image: mongo-express
    container_name: mongo-express
    restart: always
    ports:
      - "8081:8081"
    environment:
      ME_CONFIG_BASICAUTH_USERNAME: usubanipal
      ME_CONFIG_BASICAUTH_PASSWORD: 3241324qwe!
      ME_CONFIG_MONGODB_PORT: 27017
      ME_CONFIG_MONGODB_ADMINUSERNAME: rootie
      ME_CONFIG_MONGODB_ADMINPASSWORD: asdasd!
    links:
      - mongo
    networks:
      - app-network

  mongo:
    image: mongo
    container_name: mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: rootie
      MONGO_INITDB_ROOT_PASSWORD: asdasd!
    ports:
      - "27017:27017"
    volumes:
      - /Users/TuTu/COMM/volumes/MongoDB:/data/db
    networks:
      - app-network

networks:
  app-network:
    driver: bridge

【问题讨论】：

Docker 镜像的内容一旦构建就固定了；在这里运行像nodemon 这样的工具是没有意义的。我会使用您的工作主机 Node 环境进行日常开发，并将 Docker 映像设置为更直接地运行 CMD ["node", "index.js"]。

【参考方案1】：

解决了！只需使用正确的语法在 docker-compose.yml 中添加 volumes

version: "3"

services:
  tasks:
    container_name: tasks
    build:
      context: ./tasks
      dockerfile: Dockerfile
    command: npm start
    volumes:
      - ./tasks:/usr/tasks
    ports:
      - "3000:3000"
    networks:
      - app-network

  server:
    container_name: server
    build:
      context: ./server
      dockerfile: Dockerfile
    command: npm start
    volumes:
      - ./server:/usr/server
    ports:
      - "4000:4000"
    networks:
      - app-network

  mongo-express:
    image: mongo-express
    container_name: mongo-express
    restart: always
    ports:
      - "8081:8081"
    environment:
      ME_CONFIG_BASICAUTH_USERNAME: usubanipal
      ME_CONFIG_BASICAUTH_PASSWORD: 3241324qwe!
      ME_CONFIG_MONGODB_PORT: 27017
      ME_CONFIG_MONGODB_ADMINUSERNAME: rootie
      ME_CONFIG_MONGODB_ADMINPASSWORD: asdasd!
    links:
      - mongo
    networks:
      - app-network

  mongo:
    image: mongo
    container_name: mongo
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: rootie
      MONGO_INITDB_ROOT_PASSWORD: asdasd!
    ports:
      - "27017:27017"
    volumes:
      - /Users/TuTu/COMM/volumes/MongoDB:/data/db
    networks:
      - app-network

networks:
  app-network: