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Docker & Containers

Intermediate10-14 hours4 modules16 lessons

Package applications so they run identically everywhere: images, Dockerfiles, volumes, networks, Compose and production concerns.

Start the first lesson

Prerequisites

  • Comfort with a command line
  • An application you can build, in any language

Technologies

About this course

A container bundles your application with its dependencies so it behaves the same on your machine as on a server. That single property removes a whole category of environment problems.

This course starts with what a container actually is, compared honestly against a virtual machine, because the difference explains why containers start in under a second.

You will containerise both a .NET API and a front-end application, then use Compose to run them together with a database. The final module covers the things that separate a working image from one you would deploy: multi-stage builds, non-root users, layer caching and health checks.

Course roadmap

All 16 lessons are written and available.

Module 01

Container Concepts

What a container is, honestly compared with a virtual machine.

3/3 ready
  1. 01What Is a Container?Explain what a container isolates and what it shares.14 min
  2. 02Containers vs Virtual MachinesExplain how a container differs from a virtual machine and why that difference matters in practice.12 min
  3. 03Images and ContainersDistinguish the package from the running instance.14 min

Module 02

Building Images

Write a Dockerfile, understand layers, and keep builds fast.

4/4 ready
  1. 01Writing a DockerfileDescribe how to build an image, instruction by instruction.20 min
  2. 02Building ImagesBuild and tag images, and read the build output.16 min
  3. 03Layers and Build CachingOrder instructions so rebuilds stay fast.18 min
  4. 04Multi-Stage BuildsBuild in one stage and ship a minimal runtime image from another.16 min

Module 03

Running Containers

Ports, storage, networking and configuration at run time.

5/5 ready
  1. 01Running ContainersStart, stop, inspect and remove containers.16 min
  2. 02PortsMap container ports to the host and diagnose when it does not work.16 min
  3. 03Volumes and PersistenceKeep data alive beyond the container that wrote it.16 min
  4. 04NetworksLet containers reach each other by name.16 min
  5. 05Environment VariablesConfigure a container at run time instead of baking settings into the image.16 min

Module 04

Compose and Production

Run a realistic multi-service setup, then harden it.

4/4 ready
  1. 01Docker ComposeDefine and run a multi-service setup from one file.20 min
  2. 02Containerising a .NET ApplicationBuild an efficient production image for an ASP.NET Core app.22 min
  3. 03Container SecurityRun as a non-root user and reduce what the image contains.20 min
  4. 04Production ConsiderationsAdd health checks, resource limits and sensible logging.20 min

On completion

What you should take away

  • Containers share the host kernel, which is why they are fast and small compared to virtual machines
  • An image is built in layers, and layer order determines your build speed
  • Configuration belongs in environment variables, not in the image
  • A production image runs as a non-root user and reports its own health

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Cloud & DevOps Foundations

Cloud concepts that transfer between providers, plus the automated pipeline that gets your code from commit to running system.

Continue to Cloud & DevOps

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