How do I set up a Node.js application using Docker Compose?

How do I set up a Node.js application using Docker Compose?

To set up a Node.js application with Docker Compose, you'll need a Dockerfile and a docker-compose.yml file. Do you have a specific project in mind?

Yes, I want to create a simple Express app. What should my Dockerfile look like?

Your Dockerfile should look something like this:

FROM node:14
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["node", "app.js"]

This sets up a Node.js environment and installs your dependencies.

Great! And what about the docker-compose.yml file?

Your docker-compose.yml file could look like this:

version: '3'
services:
  app:
    build: .
    ports:
      - '3000:3000'

This will build your app service and map port 3000 on your host to port 3000 in the container.

Thanks! How do I run the application now?

You can run your application by executing docker-compose up in your terminal. This will start your Node.js app in a Docker container.