How to EXPOSE Port on running container

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Good Bill,
There is the way from Docker, where we use “-P” (upper case “P”)to auto mapping to host from container. In that case, why can’t have option for auto EXPOSE.

And there is option to expose port while starting the container. also…

docker run -i --expose=22 b5593e60c33b bash

if EXPOSE port (extra) it simple Reserve only, no use of those port’s it right?

Regards
Asura

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