How can I use multi-stage builds in Docker Compose?

How can I use multi-stage builds in Docker Compose?

You can use multi-stage builds in Docker Compose by defining multiple build stages in your Dockerfile and referencing them in your docker-compose.yml.

Can you give me an example of a Dockerfile with multi-stage builds?

Sure! Here's a simple example:

# First stage: build the application
FROM node:14 AS builder
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build

# Second stage: serve the application
FROM nginx:alpine
COPY --from=builder /app/build /usr/share/nginx/html
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]

How do I reference this Dockerfile in my docker-compose.yml?

In your docker-compose.yml, you can reference the Dockerfile like this:

version: '3'
services:
  web:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "80:80"

What are the benefits of using multi-stage builds?

Multi-stage builds help reduce the final image size, improve build times, and keep your images clean by separating build dependencies from runtime dependencies.