Port Mapping with Docker

Manfred Lange
9 min readApr 9, 2023

Why and how to use port mapping in Docker? An introduction for beginners.

In my experience working with software engineers, I have noticed time and again that the concept of of port mapping with Docker containers is one of the more challenging concepts. The typical problems include:

  • Why we need ports in the first place?
  • How to configure port numbers for containers?

In this article I will focus on these but also touch briefly on adjacent topics. The incremental approach I will use works quite well in practice…