With the Dockerfile you can only expose the port to the host (i.e: using EXPOSE) - you cannot automatically forward it as well. The -P (or --publish-all) option will forward all EXPOSE'd ports for you, but this is still not necessarily ideal, as it will use random ports on this host interfaces (use docker port ${CONTAINER} to check).
Define port mappings using EXPOSE When writing your Dockerfiles, the instruction EXPOSE tells Docker the running container listens on specific network ports. This acts as a kind of port mapping documentation that can then be used when publishing the ports.
Tells Docker which ports to publish when the -P flag is used ✅ If you run a container with the -P (or --publish-all) flag, Docker will grab all exposed ports and map them to random high-order ports on the host. The -P flag can be useful when you don’t want to poke into the image to figure out what ports you need to publish.
Oct 16, 2015 · The -P option on the run command will automatically expose any ports needed from the container to the host machine, while the -p option lets you specify ports to expose from the container to the...
Jun 12, 2019 · Docker is the most common tool to create, deploy, and run applications by using containers. It allows you to package up an application with all of the parts it needs (such as libraries and other dependencies) and ship it all out as one package, allowing for the portable sharing of containers across different machines.
The EXPOSE instruction informs Docker that the container listens on the specified network ports at runtime. EXPOSE does NOT make the ports of the container accessible to the host. To do that, you must use either the -p flag to publish a range of ports or the -P flag to publish all of the exposed ports.
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