Ops Docker Foundations

Mastering the container lifecycle and professional Dockerfile creation.

jcorpac 1f2d1da 848 B Updated

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Docker Foundations

Containers provide consistent environments across development and production.

Image Layers

  • Caching: Structure your Dockerfile to put static layers (like OS updates) at the top and changing layers (code) at the bottom to speed up rebuilds.
  • Images vs Containers: An image is the blueprint; a container is the running instance.

Professional Dockerfile

  • Base Images: Use official, minimal images (e.g., python:3.11-slim).
  • Commands: Master RUN, COPY, WORKDIR, EXPOSE, and CMD/ENTRYPOINT.

Best Practices

  • Single Responsibility: One service per container.
  • .dockerignore: Exclude node_modules, venv, and .git to keep images small and secure.

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