Docker for DevOps

A complete Docker course for DevOps that starts from absolute zero — no prior experience needed. From terminal orientation and installation, through building images, running, networking, volumes, Docker Compose and secrets, to registries, CI/CD, hardening, and a hands-on capstone project. A gradual difficulty curve built around real scenarios.

Why Docker Exists
The Terminal Without Fear
Installing Docker and Running Your First Command
Your First Container
How Programs Run
Images vs Containers
A Professional First Dockerfile
Layers and Build Cache
Multi-stage Builds
Running Containers in the Background
Container Lifecycle: Stop and Remove
When Something Breaks: Common Errors and How to Read Them
Volumes and Persistent Data
Container Networking Basics
Service Discovery by Name
Docker Compose for Multi-service Apps
Secrets, Environment, and Configuration
Registry, Tags, and CI/CD
Hardening: Non-root and Minimal Base
Production Readiness: Health and Secrets
Capstone: Wrap a Real App in Docker