Dockerfile

Dockerfile

• dockerfile manuals:
  • https://takacsmark.com/dockerfile-tutorial-by-example-dockerfile-best-practices-2018/
• best practice:
  • https://docs.docker.com/develop/develop-images/dockerfile_best-practices/

key instructions

• FROM - base image
• ENV variable=test
  • environment variable
  • can be used with bash syntax $variable
• VOLUME [ "/var/test" ]
  • used to expose some storage
• CMD
  • what command should be run in the image
  • CMD [“executable”, “param1”, “param2”, ...]
  • Its possible to override the command on starting up a container docker run myImage:latest _command_
  • Only last CMD will be used (so specifiy only one).
  • Its a good practice to specify at leaset a shell command here.
• ENTRYPOINT
  • Used to specify the 'main executable' of the image
  • If ENTRYPOINT is specified, CMD paramas will be added to the ENTRYPOINT

  • ENTRYPOINT ["git"]
    CMD ["--help"]
    

building

Docker CLI