Run app on Docker

• Create Dockerfile file

FROM node:node:14.20.0

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
COPY . .

# Expose app ports
EXPOSE 6075

# Start application
CMD [ "npm", "start" ]

• Create dockerignore file

node_modules
npm-debug.log

• Building your images:

docker build -t eric/atlas-app .

• Check docker image list

docker images

REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
eric/atlas-app   latest              d6e01bdfc655        40 minutes ago      1.24GB

• Run the image

docker run -p 8888:6075 -d -it eric/atlas-app

In the example above, Docker mapped the 6075 port inside of the container to the 8888 port on your machine. so you should access the first 6075(1) port to test. You may use the different ports.

• Get container ID

docker ps

• Print app output

docker logs <container id>

• Test your app Access url http://localhost:8888

• Enter the container, run command inside container

docker exec -it <container id> /bin/bash

🔗 Dockerizing a Node.js web app

Next step, will try docker compose. 😊

Docker Compose for NodeJS Web App

• Create docker-compose.yml

app:
  build: ./
  volumes:
    - ./:/usr/src/app
  ports:
    - 8888:6075
  environment:
    - NODE_ENV=development
    - PORT=6075
  command: 'npm start'
  restart: always

8888 is the post of host machine，6075 is the port of app inside docker container.

• Build and Run

docker-compose -f ./docker-compose.yml up -d

• List container and related logs

docker ps

docker logs <container id>

• Execute bash inside docker container

docker exec -it <container id> /bin/bash

Reference：

🔗 A Docker/docker-compose setup with Redis and Node/Express

🔗 Using Docker Compose for NodeJS Development

🔗 使用 docker-composer 部署 nodejs 应用