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09 – Deploying Docker Containers
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Docker & Kubernetes: The Practical Guide
About Lesson

In the last lecture, we started a container which also exposed a port (port 80).

I just want to clarify again, that EXPOSE 80 in the Dockerfile in the end is optional. It documents that a process in the container will expose this port. But you still need to then actually expose the port with -p when running docker run. So technically, -p is the only required part when it comes to listening on a port. Still, it is a best practice to also add EXPOSE in the Dockerfile to document this behavior.

As an additional quick side-note: For all docker commands where an ID can be used, you don’t always have to copy / write out the full id.

You can also just use the first (few) character(s) – just enough to have a unique identifier.

So instead of

docker run abcdefg

you could also run

docker run abc

or, if there’s no other image ID starting with “a”, you could even run just:

docker run a

This applies to ALL Docker commands where IDs are needed.