ADD vs COPY

• ADD allows copying from the URL
• ADD allows tar file auto-extraction

ARG vs ENV

• ARG is used to set build-time variables with key and value.
• ARG variables will not be available when the container is running.

CMD vs ENTRYPOINT

• CMD is used to execute a command in a running container.
• There can be only one CMD
• Specifies the commands that will execute when the Docker container starts.