What are some examples of Docker multi-stage builds?

What are some examples of Docker multi-stage builds?

Docker multi-stage builds allow you to optimize your images by using multiple FROM statements. For example, you can compile your application in one stage and then copy only the necessary artifacts to a smaller final image.

Can you show me a simple example of a multi-stage Dockerfile?

Sure! Here's a simple Dockerfile:

# First stage: build the application
FROM golang:1.16 AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp

# Second stage: create a smaller image
FROM alpine:latest
WORKDIR /root/
COPY --from=builder /app/myapp .
CMD ["./myapp"]

What are the benefits of using multi-stage builds?

The benefits include reduced image size, improved build times, and better separation of concerns, as you can keep your build environment separate from your runtime environment.

Are there any limitations to using multi-stage builds?

Yes, some limitations include increased complexity in Dockerfiles and potential longer build times if not optimized properly. However, the benefits often outweigh these drawbacks.