How to troubleshoot 'Bind for 0.0.0.0:80 failed: port is already allocated' error in Docker

# Introduction

When working with Docker containers, you might encounter the error message "Bind for 0.0.0.0:80 failed: port is already allocated." This error occurs when you try to map a container port to a host port that is already in use by another process or container.

In this lab, you will learn how Docker port mapping works, what causes this common error, and the various techniques to troubleshoot and resolve port conflicts. By the end of this lab, you will be able to effectively diagnose and fix port binding issues in your Docker environment.