// docker.eknathalabs.com  —  by Platform Engineers

Master
Container
Engineering 🐳

8 offline tools, 100-question quiz, 150+ commands, and structured learning modules. Free forever.

docker — container lifecycle
eknatha@dockerlab $ docker build -t myapp:v2 --no-cache .
✓ FROM node:20-alpine ✓ RUN npm ci --only=production ⚠ COPY . . — add .dockerignore to exclude node_modules ✓ Successfully built b3a9f7c1d2e4 (94MB)
eknatha@dockerlab $ docker run --rm -p 3000:3000 myapp:v2
✓ Container started · http://localhost:3000
eknatha@dockerlab $
8
Offline Tools
10
Modules
100
Quiz Q&A
60+
Best Practices
150+
Commands
Free
Always

// AI-Powered Tools

8 offline tools built for
container engineers

🔍
Dockerfile Linter
Paste any Dockerfile → get security, performance & best-practice issues
📖
Dockerfile Explainer
AI breaks down every instruction line-by-line with context
🎼
Compose Explainer
Understand services, dependencies and networking from your compose.yaml
🛠️
Dockerfile Generator
Describe your app → get a production-ready Dockerfile instantly
📉
Image Optimizer
Get layer-by-layer optimization suggestions to shrink your image
🐛
Error Troubleshooter
Paste docker error output → AI diagnoses root cause & fix steps
🔒
Security Auditor
Scan for misconfigs: root user, exposed ports, vulnerable base images
🌐
Network Explainer
Explain Docker networking: bridge, overlay, host, macvlan concepts
OFFLINE TOOLS
🔍 Dockerfile Linter
Paste your Dockerfile below. A built-in offline engine analyzes it for errors, security issues, and best practices.
📄 DockerfilePaste your Dockerfile
📋 Analysis Results
Click "Analyze Dockerfile" to see results — runs fully offline.
📖 Dockerfile Explainer
Paste any Dockerfile and get a clear, line-by-line explanation of what each instruction does and why.
📄 Dockerfile
💡 Explanation
Click "Explain Dockerfile" to get a line-by-line breakdown...
🎼 Compose Explainer
Paste your docker-compose.yaml and understand every service, network, and dependency.
📄 docker-compose.yaml
💡 Compose Breakdown
Click "Explain Compose" to get a full breakdown...
🛠️ Dockerfile Generator
Describe your application and get a production-ready, optimized Dockerfile generated instantly.
📝 Describe your app (optional details)
📄 Generated Dockerfile
Click "Generate Dockerfile" to get your custom Dockerfile...
📉 Image Optimizer
Paste your Dockerfile and get specific recommendations to reduce image size and improve build speed.
📄 Dockerfile to Optimize
📊 Optimization Report
Click "Optimize Image" for size reduction recommendations...
🐛 Error Troubleshooter
Paste any Docker error output and get a root cause analysis with step-by-step fix instructions.
💥 Error Output / Logs
🔧 Diagnosis & Fix
Paste your error and click "Diagnose Error" to get a fix...
🔒 Security Auditor
Audit your Dockerfile for security misconfigurations, vulnerabilities, and hardening opportunities.
📄 Dockerfile
🛡️ Security Report
Click "Security Audit" to scan for vulnerabilities...
🌐 Network Explainer
Describe your Docker networking question or paste a compose/run command to get a clear explanation.
❓ Your networking question or compose snippet
🔎 Networking Explanation
Click "Explain Networking" to get a clear breakdown...
Question 1 / 30 ⚡ 0 XP
BASICS

// Docker Cheatsheet

150+ Commands, click to copy

// Learning Modules

Zero to Container Expert

10 structured modules. Click any module to expand topics.

// Best Practices

60+ Docker Best Practices

Production-proven rules. Click any category to expand. Severity: Critical · Important · Recommended

// Real-World Dockerfile Library

Production Dockerfiles

Battle-tested, production-ready Dockerfiles. Click to copy. All use multi-stage builds, non-root users, and optimal caching.

🏅

Docker Certified Associate (DCA)

The DCA exam validates your skills as a Docker practitioner. This guide covers all 6 domains, exam weighting, key topics, study tips, and curated resources to pass on your first attempt.

55 questions 90 minutes Score ≥ 65% to pass Multiple choice + multi-select Online proctored

// Exam Domains — click to expand

🎯 Study Tips & Strategy

Focus on Swarm & Orchestration
Orchestration is 25% of the exam. Know Swarm mode deeply: services, stacks, replicas, rolling updates, drain/active node states.
Hands-on with Docker Play
Use play-with-docker.com for free lab time. Practice the exact commands you read about — muscle memory matters for timed exams.
Know the CLI flags cold
Many questions test specific flags. Know: docker service create, docker network create, docker volume create, docker stack deploy options.
Read the official docs
The exam is based on Docker documentation. Focus on docs.docker.com sections matching each domain. The exact wording matters.
Use this quiz bank
Filter by Security, Networking, and Compose in the DockerLab quiz — those categories map directly to DCA exam domains.
Schedule when ~80% ready
Don't wait until you feel 100% ready — it rarely comes. Practice exams at 70%+ accuracy are a reliable signal you are exam-ready.

📚 Study Resources

🏅
Official DCA Exam Page
Mirantis — register for the exam, official study guide, exam blueprint
📖
Docker Official Documentation
The source of truth. Every exam question is based on these docs
🧪
Play With Docker
Free browser-based Docker environment — practice Swarm, multi-node setups
🧠
DockerLab Quiz (this site)
100 questions covering all DCA domains — filter by Security, Networking, Compose
⌘
DockerLab Cheatsheet
150+ commands — know the exact syntax before exam day
🐙
DCA Study Guide (GitHub)
Community-maintained DCA prep notes, questions, and links by Evalle