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Optimize Dockerfile

Company: Shopify | Difficulty: Medium

Scenario

A Dockerfile at /home/interview/Dockerfile successfully builds a Go application, but the resulting Docker image is over 800MB in size due to including the full Go toolchain, build dependencies, and source code. Production images must be under 200MB.

Task

Rewrite the Dockerfile using a multi-stage build pattern to separate the build environment from the runtime environment. Use Alpine as the base image for the final runtime stage, ensure only the compiled binary and necessary runtime dependencies are copied to the final stage, build the optimized image with the tag myapp:fixed, and verify the final image size is below 200MB while maintaining full functionality.

Example

# Before (bloated image)

REPOSITORY    TAG       SIZE
myapp         original  550MB

# After (optimized multi-stage build)

REPOSITORY    TAG       SIZE
myapp         fixed     45.3MB