为什么Dockerfile不运行多个命令

Question

我想用Docker运行我的项目（react + nodejs + mongodb），

Dockerfile：

FROM node:8.9-alpine

ENV NODE_ENV production

WORKDIR /usr/src/app

COPY ["package.json", "package-lock.json*", "npm-shrinkwrap.json*", "./"]

RUN npm install --production --silent && mv node_modules ../

COPY . .

CMD nohup sh -c 'npm start && node ./server/server.js'

码头工人，compose.yml：

version: '2.1'

services:
  chat:
    image: chat
    container_name: chat
    build: .
    environment:
      NODE_ENV: production
    ports:
      - "3000:3000"
      - "8080:8080"
    volumes:
      - ./:/usr/src/app
    links:
      - mongo
  mongo:
    container_name: mongo
    image: mongo
    ports:
      - "27017:27017"

运行docker-compose up --build，3000端口工作，但8080端口死了

localhost:3000

localhost:8080

Answer 1

我建议为服务器创建一个容器，并将其与“chat”容器分开。最好让每个容器只做一件事和一件事（几乎就像unix命令背后的哲学）

在任何情况下，这里都会对compose文件进行一些修改。

version: '2.1'

services:
  chat:
    image: chat
    container_name: chat
    build: .
    environment:
      NODE_ENV: production
    ports:
      - "3000:3000"
      - "8080:8080"
    volumes:
      - ./:/usr/src/app
    links:
      - mongo
  mongo:
    container_name: mongo
    image: mongo
#   You don't need to expose this port to the outside world. Because you linked the two containers the chat app
# will be able to connect to mongodb using hostname mongodb inside the container network.
#    ports:
#      - "27017:27017"

顺便说一句，如果你运行会发生什么：

$ docker-compose down

然后

$ docker-compose up

$ docker ps

你能看到docker ps输出中暴露的端口吗？

Answer 2

您的聊天服务取决于mongo，因此您还需要在聊天中使用此功能

depends_on:
  - mongo

这个docker-compose文件适合我。请注意，我将数据从数据库保存到本地目录。您应该将此目录添加到gitignore。

version: "3.2"
services:
  mongo:
    container_name: mongo
    image: mongo:latest
    environment:
      - MONGO_INITDB_ROOT_USERNAME=root
      - MONGO_INITDB_ROOT_PASSWORD=password
      - NODE_ENV=production
    ports:
      - "28017:27017"
    expose:
      - 28017 # you can connect to this mongodb with studio3t
    volumes:
      - ./mongodb-data:/data/db
    restart: always
    networks:
      - docker-network
  express:
    container_name: express
    environment:
      - NODE_ENV=development
    restart: always
    build:
      context: .
      args:
        buildno: 1
    expose:
      - 3000
    ports:
      - "3000:3000"
    links:
      - mongo # link this service to the database service
    depends_on:
      - mongo
    command: "npm start" # override the default command to use nodemon in dev
    networks:
      - docker-network
networks:
  docker-network:
    driver: bridge

您还可能发现使用节点必须等待mongodb容器准备好才能连接到数据库。