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Discussion on: Demystifying Docker Compose

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Antonio Savage

Because I'm picky, size matters with Docker images so you might want to clean up the apt cache after you're done installing those apps. Just add a line after the apt installs
rm -rf /var/lib/apt/lists/*

Also, I'm not familiar with Ruby but you may be able to do some cleanup too after the build command or even build the app in a throwaway container and use the artifact in this one. Check it out here. docs.docker.com/develop/develop-im...