Docker Dockerfile

• Dockerfile reference | Docker Docs

Multistage Dockerfiles

• Multi-stage Dockerfiles allow you to write separate Dockerfiles into one file
• ENV variables are not passed between stages From Using Multi-Stage Builds to Simplify And Standardize Build Processes | by Sven Hans Knecht | Capital One Tech | Medium

Best Practises

• Use COPY over ADD
• Two ways to specify a CMD
  • Exec Form: CMD ["executable", "param1", "param2"]
    • variables cannot be used
  • Shell Form: CMD command param1 param2
    • variables can be used, but Signals are sent to the invoking shell, not to the app
    • CMD exec can be used to give enable passing down signals to the following command
• You can use a Dockerfile as your CI container Containerized development with NestJS and Docker - LogRocket Blog
• Create a volume for any folder that is written to
• Assign group root to any created user (Because Kubernetes gives this group access for all created volumes)
  • Also, Kubernetes apparently works better with ids rather than user names
• Any kind of modification of a file will create another copy. (i.e when you chown a file)
  • the COPY file has an --chown argument
• Disable package manager cache when installing stuff ()