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666+ 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
Your Container Is Not a Security Boundary: GhostLock (CVE-2026-43499)
A 15-year-old Linux kernel bug just got a public exploit that breaks out of containers and hands any local user root on the host. GhostLock is a reminder that the container is not your security boundary, the shared kernel is. Here is what actually shrinks the blast radius.
How Docker Really Works, From docker run to the Kernel
You type docker run and a container appears. Between those two moments the CLI, dockerd, containerd, and runc hand work down a chain until the Linux kernel puts your process in its own namespaces and cgroups. Here is the whole path, with the real commands to watch it happen.
Migrating From S3 to Branch-Aware Storage
Neon object storage is S3-compatible, so moving to it is mostly a config change, not a rewrite. Your upload code, your presigned URLs, and your download paths all stay the same. Here is exactly what carries over, the small diff that changes, and a copy script to move the objects, with the honest list of what does not come along.
Stop Standing Up an S3 Bucket Per Preview Environment
Giving every preview environment isolated file storage usually means provisioning a real bucket per environment: policies, IAM, lifecycle rules, credentials, and a teardown job that leaves orphans anyway. When the bucket rides the database branch, that whole apparatus disappears. Here is the difference, tested.
Stop Prompting, Start Looping: Agentic Loops Explained
The best engineers stopped hand-writing prompts and started writing loops. Here is what an agentic loop actually is, the plan-build-judge pattern behind it, why the judge has to be a separate agent, and how to try it in an interactive simulator.
The Docker AuthZ Bypass Is Back: CVE-2026-34040
CVE-2026-34040 lets a crafted API request slip past Docker authorization plugins, and it is an incomplete fix of the 2024 maximum-severity bug. Here is how the bypass works, who is exposed, and how to close 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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