Dockerfile is a text file where you define instructions used to create your Docker images, check official Dockerfile Reference documentation: https://docs.docker.com/engine/reference/builder/

For creating this file with instructions usually called Dockerfile you can use the following keywords^[1]:

• ADD
• ARG
• CMD, for executing containers. https://docs.docker.com/engine/reference/builder/#cmd
• COPY
• ENTRYPOINT: https://docs.docker.com/engine/reference/builder/#entrypoint
• ENV
• EXPOSE
• FROM
• HEALTHCHECK
• LABEL
• ONBUILD
• RUN: https://docs.docker.com/engine/reference/builder/#run
• SHELL
• STOPSIGNAL
• USER
• VOLUME
• WORKDIR

Activities

1. Learn differences between RUN and CMD or ENTRYPOINT: https://stackoverflow.com/a/25150809
2. Read Understand how CMD and ENTRYPOINT interact https://docs.docker.com/engine/reference/builder/#understand-how-cmd-and-entrypoint-interact

See also

• Docker compose
• docker inspect
• DevOps/Docker/Start configuration behavior and restart policy

1. ↑ https://kapeli.com/cheat_sheets/Dockerfile.docset/Contents/Resources/Documents/index