Tutorials Cloud Computing Tutorial
Docker — Complete Guide
Docker — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Cloud Computing Tutorial on Toolliyo Academy.
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Cloud Computing Tutorial · Lesson 23 of 100
Docker
Foundations ✓ → Platform → Ops → Projects
Platform · 2 — Containers & data · ~6 min · Cloud — Virtualization & Containers
What is this?
Docker packages apps and dependencies into images you run as containers anywhere Docker Engine exists.
Why should you care?
CloudVerse services ship as images to keep “works on my machine” out of production.
See it live — copy this example
Use AWS/Azure/GCP free tier or local Docker/Kind. Sketches and YAML are meant to be typed and adapted.
FROM mcr.microsoft.com/dotnet/aspnet:8.0
WORKDIR /app
COPY publish/ ./
ENTRYPOINT ["dotnet", "CloudVerse.Api.dll"]
# docker build -t cloudverse/api:1.0.0 .
# docker run --rm -p 8080:8080 cloudverse/api:1.0.0What happened?
- Images are layered.
- Tag versions immutably.
- Do not run as root when avoidable.
Practice next
- Write a Dockerfile.
- Build and run locally.
- Hit /health.
- Multi-stage build.
- Scan image for CVEs.
Remember
Image = app+deps. Immutable tags. Non-root when possible.
CloudVerse API image
dotnet API in Docker.
Outcome: Same image runs on laptop and cluster.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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