How can you reduce the size of a Docker image?

To reduce the size of a Docker image, you can use several approaches:

• Choosing a base image: Use minimalist images, such as alpine instead of ubuntu.
• Multi-stage builds: Build the application in one image, then copy only the necessary artifacts into the final image.
• Optimizing layers: Combine RUN commands to reduce the number of layers.
• Removing temporary files: Delete caches, temporary files, and packages after installation.
• Minimizing dependencies: Install only the necessary packages and libraries.

Example of a multi-stage build:

FROM golang:1.20-alpine AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp

FROM alpine
COPY --from=builder /app/myapp /myapp
CMD ["/myapp"]