Dockerfile 101

This page was converted from my old blog and hasn't been reviewed. If you see an error please let me know in the comments.

Quick overview presentation I did on Dockerfiles.  Includes some best practices.

  • use .dockerignore to avoid adding unnecessary files to your image
  • Don’t run apt-update on a single line. This will cause caching issues if the referenced archive gets updated, which will make your subsequent apt-get install fail without comment.
  • Avoid installing unecessary packages
  • Always use version tags in FROM statements.  Avoid :latest
  • Avoid run + commit,  use a Dockerfile instead
  • Installing ssh into a container is not clever
  • One Process per container
  • Leverage and understand the cache
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