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558+ simulators, quizzes, and hands-on exercises for engineers who prefer a terminal over a slide deck.
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Interactive Simulators
DNS Resolution Simulator
Walk through the full DNS resolution process step by step
Kubernetes Scheduler
Place pods on nodes based on resource requests and constraints
Load Balancer Simulator
Compare round-robin, least connections, and weighted algorithms
CI/CD Pipeline Builder
Design a deployment pipeline with stages, gates, and rollbacks
Caching Simulator
See how cache hit rates change with different strategies
DDoS Defense
Protect your infrastructure from simulated attack patterns
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Popular Categories
Explore our content by topic
Docker
Containerization platform
Terraform
Infrastructure as code
Git
Git and version control for developers
Kubernetes
Container orchestration and management
Linux
Linux operating system and distributions
DevOps
DevOps practices and tools
Bash
Bash scripting and command line
Networking
Networking concepts and practices
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Hands-On Exercises
Practice real-world DevOps scenarios with step-by-step guidance
Git Workflow and Collaboration Fundamentals
Master essential Git workflows, branching strategies, and collaboration techniques used in modern development teams.
Redis Caching Strategies for Scalable Applications
Implement production-ready caching patterns with Redis to dramatically improve application performance and scalability.
Linux Performance Tuning and Troubleshooting
Master essential Linux performance analysis and optimization techniques to diagnose and resolve system bottlenecks.
Nginx Load Balancing and Reverse Proxy
Master load balancing and reverse proxy patterns with Nginx to build resilient, scalable infrastructure.
Complete Web Server Automation with Ansible
Build a comprehensive Ansible playbook to automate web server deployment, configuration, and security hardening across multiple environments.
Deploy a DigitalOcean Droplet with Terraform
Learn Infrastructure as Code basics by deploying a simple web server on DigitalOcean using Terraform. Perfect for beginners starting their IaC journey.
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Test Your Knowledge
Short interactive quizzes across Docker, Kubernetes, Terraform, networking, and more
Ansible Configuration Management Quiz
Configuration Management
Test your Ansible skills with playbooks, roles, inventory management, and automation scenarios for infrastructure configuration
GitOps with Argo CD: Multi-Environment Repository Structure Quiz
GitOps
Test your knowledge of structuring Git repositories for Argo CD deployments across dev, staging, and production environments. Covers repo layout patterns, ApplicationSets, Kustomize overlays, Helm value files, and sync policies.
AWS Cloud Services Quiz
AWS
Master cloud architecture through real-world AWS scenarios covering compute, storage, networking, and best practices
CI/CD Fundamentals Quiz
CI/CD
Master the basics of Continuous Integration and Continuous Deployment, including pipelines, version control, automated testing, and deployment strategies
CI/CD Pipelines Quiz
CI/CD
Master continuous integration and deployment with practical pipeline scenarios and best practices
Cloud Cost Allocation Tags Quiz
FinOps
Debug tagging gaps, fix broken cost reports, and set up consistent allocation tags across AWS, GCP, and Azure for accurate chargeback and showback
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Latest Posts
Stay up to date with the latest DevOps content
The MCP Design Flaw That Exposes 150M Downloads to RCE
Researchers at OX Security disclosed an architectural vulnerability in Anthropic MCP that enables remote code execution across Python, TypeScript, Java, and Rust SDKs. Anthropic calls it "by design." Here is how the flaw works, which tools are affected, and what to do if you use Cursor, Claude Code, LangChain, or anything with an MCP server.
How to Set Up Cloud Cost Allocation Tags Across AWS, GCP, and Azure
A working playbook for tagging resources across AWS, GCP, and Azure so finance can finally answer which team spent what, and engineers can prove their workload is not the expensive one.
The Vercel April 2026 Security Incident: What Happened and What to Do About It
Vercel disclosed a security incident that started with a compromised OAuth app at Context.ai, escalated through a Vercel employee Google Workspace account, and reached internal systems plus customer environment variables not marked sensitive. Here is the attack chain, what was exposed, and what to change in your deployments.
How Does It Work So Fast? The Engineering Behind Instant UI Responses
Credit card validation, username checks, autocomplete, URL shorteners - they all feel instant. Here is what is actually happening under the hood in each case.
Two Composer Command Injection Flaws Let Attackers Run Arbitrary Code - Even Without Perforce
CVE-2026-40176 and CVE-2026-40261 affect all Composer 2.x versions. A malicious composer.json or crafted package metadata can execute OS commands on your machine. Upgrade to 2.9.6 now.
SLOs, SLIs, and Error Budgets: A Practical Implementation Guide
Your service went down at 2 AM and nobody could agree on whether it was "bad enough" to page someone. SLOs, SLIs, and error budgets fix that. Here is how to define, measure, and act on them with real Prometheus queries and alerting rules.
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Latest Guides
Step-by-step tutorials to boost your DevOps skills
Security Gates
Implement automated security gates that block deployments on critical vulnerabilities, policy violations, and security failures. Shift security left in your CI/CD pipeline.
Introduction to Packer
Learn how to build automated machine images with HashiCorp Packer, from basic concepts to multi-platform image creation
Introduction to AWS
Learn AWS fundamentals step by step, from basic concepts to building your first cloud application.
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DevOps Tools and Calculators
Free, browser-only utilities. CIDR, JWT, base64, UUID, cron, K8s sizing, YAML. No sign-up, no server.
CIDR Calculator
Calculate network range, usable IP count, subnet mask, and broadcast address from a CIDR block.
JWT Decoder
Paste a JWT and see the header, payload, and signature, plus human-readable expiry and issued-at.
Base64 / URL
Encode or decode base64 and URL-safe strings. Handy for secrets, Kubernetes manifests, and API debugging.
UUID / Secret
Generate UUIDs (v4, v7), random hex tokens, and base64 secrets suitable for Kubernetes secrets or API keys.
Cron Parser
Translate cron expressions to human-readable schedules and preview the next run times.
K8s Resources
Size CPU and memory requests / limits for a Pod based on workload characteristics, replicas, and headroom.
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