Building Custom Docker Images

Welcome back! In the previous lesson, you learned to write Dockerfiles. Now, let's turn those Dockerfiles into real Docker images and share them!

We'll cover how to:

• Use the docker build command
• Tag your images for versioning
• Log in to a Docker registry
• Push your custom images for others to use

The docker build command is your tool for creating Docker images from a Dockerfile and a "build context."

• It reads the instructions in your Dockerfile.
• It executes each instruction, creating a new layer in the image.
• Finally, it produces a new Docker image.

The basic syntax is docker build [OPTIONS] PATH | URL.