What are best practices to optimize Docker image size?
Reported in TeamViewer European engineering loops. Container optimization question for build speed and security.
Interview scenario
Often asked in TeamViewer loops at European offices (London, Berlin, Amsterdam, Paris, Stockholm, Dublin, and remote EU). Prepare a clear spoken answer plus key trade-offs.
Model answer
Try answering aloud first
Cover trade-offs, structure, and a concrete example before revealing the baseline response.
How to frame this at TeamViewer: Connect your answer to measurable impact, clarity of thought, and trade-offs the team cares about. Below is a strong baseline response you can adapt with your own project examples.
Use minimal base images, multi-stage builds, and only copy required runtime artifacts into final image. This reduces attack surface and deployment pull time.
Combine package install steps carefully, clean caches, and pin dependencies for reproducibility. Also leverage .dockerignore to prevent unnecessary context from bloating layers.
Mention that smallest image is not the only goal; choose a maintainable base with timely security updates and debugging support for your environment.
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