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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
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
Test your CI/CD pipeline knowledge with scenarios covering build stages, artifact promotion, environment strategy, deployment patterns, and rollbacks.
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
Cilium 1.19 ClusterMesh Policy Flip: The Silent Default That Will Drop Your Cross-Cluster Traffic
Cilium 1.19 changed how network policies without a cluster selector resolve in a ClusterMesh. East/West traffic that 1.18 implicitly allowed is now silently dropped. Here is how to find every affected policy before you upgrade.
Karpenter Spot Storm Fallback Gap: The Production Loop Nobody Talks About
When AWS spot capacity dries up in a region, Karpenter does not automatically fall back to on-demand. It retries the same dying offerings on a 3-minute loop. Here is why, and how to design around it.
Running Your First Chaos Engineering Experiment with Litmus
A hands-on walkthrough of installing LitmusChaos on Kubernetes, killing pods on purpose, and watching whether your app actually recovers. Real YAML, real output, no theory.
When One Data Center Room Got Hot: AWS US-EAST-1, Coinbase, and the DR Drill That Was Not
On May 7, 2026, cooling failed in a single hall of one US-EAST-1 data center. Coinbase, FanDuel, and CME Group went down for hours, and Coinbase publicly confirmed their backup systems did not work as expected. Here is what happened, the multi-AZ checklist that would have caught it, and the AWS Fault Injection Simulator commands to run the drill before the next thermal event.
NGINX Rift (CVE-2026-42945): The 18-Year-Old Rewrite Bug That Hands an Attacker Your Worker Process
An autonomous code-audit tool found an 18-year-old heap overflow in NGINX's rewrite module. Affects every release from 0.6.27 through 1.30.0, plus NGINX Plus and the entire F5 product line. Full RCE PoC is public. Here is the one-line config grep that tells you whether you are exposed, the patch matrix, and what to do about the long tail of products that bundle the vulnerable nginx without a vendor patch yet.
Ingress-NGINX Is Retired: A Real Migration to Gateway API With ingress2gateway 1.0
In March 2026 the Kubernetes project retired ingress-nginx with no replacement waiting in the wings. Roughly half of all clusters still run it. This post is the migration that does not involve a flag day: how to inventory your annotations, what ingress2gateway 1.0 translates and what it silently drops, the side-by-side cutover pattern with the actual PromQL, and how to pick between Envoy Gateway, kgateway, Cilium Gateway, and Istio.
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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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