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652+ 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
Docker articles, tutorials, and guides on DevOps Daily covering containers, images, Dockerfiles, Compose, volumes, networking, and production best practices.
Terraform
Infrastructure as code
DevOps
DevOps practices and tools
Kubernetes
Container orchestration and management
Git
Git and version control for developers
Linux
Linux operating system and distributions
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
Back-of-the-Envelope Estimation Quiz
System Design
The napkin-math skill that makes or breaks a system design interview: turning users into QPS, data into storage, traffic into bandwidth, and knowing the latency numbers every engineer should have memorised.
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
Test your CI/CD pipeline knowledge with scenarios covering build stages, artifact promotion, environment strategy, deployment patterns, and rollbacks.
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Latest Posts
Stay up to date with the latest DevOps content
Stop Paginating With OFFSET: Keyset Pagination and the Deep-Page Cliff
LIMIT/OFFSET is the reflexive way to paginate, and it is fine on page one. But OFFSET makes the database generate and throw away every row before the page you want, so cost grows with page depth until deep pages fall off a cliff. Keyset pagination makes every page the same speed regardless of depth. Here is why OFFSET is slow, the fix, and the one tradeoff.
Firebase Alternatives in 2026: Choose by Why You Are Leaving, Not by a Ranking
Most "Firebase alternatives" lists rank tools you cannot compare, because Firebase is five products in a trench coat. The useful question is which part you are replacing and why you are leaving: the Firestore bill that scales with reads, or the data model you cannot port. Here is an honest map of Supabase, Appwrite, Convex, PocketBase, Nhost, Amplify and the rest, grouped by the reason you are actually switching.
Preview Environments That Include the Backend, Not Just the Frontend
Every PR gets a frontend preview URL. The backend is almost always one shared staging database, so previews quietly lie to you. On Neon a branch is the database, its data, and the functions together, so each PR can get a real isolated backend. Here is the workflow, tested end to end.
When the SSH Server Attacks the Client: libssh2 CVE-2026-55200
You spent years hardening sshd. This bug does not care. CVE-2026-55200 is a pre-auth heap overflow in libssh2 where a malicious SSH server takes over the client that connects to it, no credentials needed. And libssh2 is a client library hiding in curl, git tooling, and backup jobs all over your pipeline. Here is the bug, who is actually exposed, and how to find it in your stack.
A Postgres-Backed MCP Server in ~20 Lines
Most of what an MCP server does is run database queries on behalf of an AI agent. So I put one right next to the database. Here is a Postgres-backed MCP server built on Neon Functions, deployed onto a database branch, with the code, a live client test, and the repo.
Stop Using Random UUIDs as Primary Keys: uuidv7() Lands in PostgreSQL 18
Random UUIDv4 primary keys quietly wreck insert speed and bloat indexes on large tables. PostgreSQL 18 ships a native time-ordered uuidv7() that keeps the upsides of UUIDs without the B-tree penalty. Here are the numbers and how to adopt it.
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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 step by step by building a real cloud application. Covers IAM, EC2, S3, VPC, RDS, load balancing, Lambda, CloudWatch, and cost control.
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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
CIDR subnet calculator: parse a CIDR block to get network range, subnet mask, broadcast address, usable IPs, and check whether an IP belongs to the network.
JWT Decoder
JWT decoder that parses the header, payload, and signature in your browser. Shows human-readable expiry and issued-at, with no token sent to any server.
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
Cron expression parser that translates schedules into plain English and previews the next 5 run times in your local timezone. Validates 5 and 6-field syntax.
K8s Resources
Size CPU and memory requests / limits for a Pod based on workload characteristics, replicas, and headroom.
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