Both CMD
and ENTRYPOINT
instructions define what command gets executed when running a container. There are few rules that describe their co-operation.
- Dockerfile should specify at least one of
CMD
or ENTRYPOINT
commands. ENTRYPOINT
should be defined when using the container as an executable.CMD
should be used as a way of defining default arguments for an ENTRYPOINT
command or for executing an ad-hoc command in a container.CMD
will be overridden when running the container with alternative argument