Docker & Kubernetes · Module 01

Getting Started with Docker

Learn why containers exist, how Docker differs from VMs, the parts of Docker, and the basic container lifecycle.

Practice interactively →

What you will learn

• Explain the "matrix from hell" problem and how containers solve it
• Compare containers with VMs in terms of kernel, speed and overhead
• Tell images, containers, Docker Engine, registries and repositories apart
• Run, list, enter and clean up containers with the Docker CLI

Lessons

1. Why Docker

   Containers turn the "stack × environment" matrix into one package that runs the same everywhere.

2. Containers and VMs

   A VM virtualizes hardware and has its own guest OS; a container only isolates processes and shares the host kernel.

3. Docker architecture and terms

   The Docker CLI sends requests to the daemon; the daemon builds, pulls and runs images as containers; a registry stores and distributes images.

4. Basic Docker commands

   The container lifecycle — run, ps, logs, exec, stop, rm — and the flags you use most.