Docker & Containers

intermediate

Topic 6 of 11 in Cloud & DevOps

What it is

Docker packages your application and all its dependencies into a container — a lightweight, portable unit that runs the same way on any machine. Containers solve the 'works on my machine' problem.

Why cloud & devops developers need it

Containers are how modern apps are deployed. Docker is the foundation for Kubernetes, CI/CD pipelines, and cloud-native architecture. It is a must-know tool for any DevOps or backend role.

What to learn

Container concepts vs. virtual machines

Docker images, containers, and registries

Writing a Dockerfile: FROM, RUN, COPY, CMD

Docker Compose for multi-container setups

Volumes for persistent data

Networking between containers

Image optimisation: layer caching, multi-stage builds

Pushing images to Docker Hub or a private registry

Practice project

Containerised App Stack

Containerise a web app with Docker: write a Dockerfile for a Node.js or Python app, add a PostgreSQL container with Docker Compose, configure networking between them, and use volumes for database persistence.

Learn this on MooreSkillUp

Our Docker Fundamentals course covers this topic in depth with structured lessons, tasks, and a certificate on completion.

Cloud Computing Fundamentals

CI/CD Pipelines