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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
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DevOps
DevOps practices and tools
Kubernetes
Container orchestration and management
Security
Application and infrastructure security
Git
Git and version control for developers
Docker
Docker articles, tutorials, and guides on DevOps Daily covering containers, images, Dockerfiles, Compose, volumes, networking, and production best practices.
Networking
Networking concepts and practices
Linux
Linux operating system and distributions
Terraform
Infrastructure as code
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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
APIs, Async and Config Quiz
API Design
Trace common production problems across REST and GraphQL, JavaScript promises, YAML configuration, and the PostgreSQL wire protocol. Scenario questions about the details that make integrations reliable.
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
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Latest Posts
Stay up to date with the latest DevOps content
Five Production Bugs You Can Reproduce in a Browser Tab
A cache can leak a cart, one packet can pause an HTTP/2 page, and a shared DataLoader can disclose another user's data. Learn the mechanism, the production check, and a small lab reproduction for five failures worth recognizing before an incident.
CKNE Is Live: What the Kubernetes Network Engineer Exam Tests and How to Practice
CKNE is a new hands-on Kubernetes networking exam. Use its published domains to build a lab, rehearse packet-level debugging, and turn DNS, traffic, policy, encryption, and observability into timed terminal drills.
Who's On Call for the AI Agent? A Production Runbook
An agent that can call production tools is a service with an incident path, not a clever prompt. Assign an owner, page only for harm in progress, test a kill switch, scope its identity, and keep enough evidence to explain every action.
We Tested AWS Emulator: It Blocks More Than Its Docs Say, and Less Than AWS Does
AWS Emulator passed all 40 of our workflow checks and caught two IAM mistakes in our own test code. It also let a user with no policies assume an admin role, ignored permissions boundaries and session policies, and with the default JavaScript SDK settings, one SQS request went to real AWS. Here is what we measured on a throwaway droplet.
Disk Full but du Disagrees: Finding Deleted Files That Still Use Space
When df reports a full filesystem but du cannot find the bytes, an unlinked log held open by a process is often the missing space. Find the holder, release space safely, and prevent the next midnight disk-full incident.
Node.js November 2026 Security Release: How We Tracked and Patched It
Node.js 22.23.5, 24.22.3 and 26.13.1 fix 16 CVEs, seven of them high severity in HTTP/2 and TLS. Here is what was fixed, who should upgrade first, the 15-minute watcher that told us the release was out, and the nvm, pm2 and systemd steps we used to move production in minutes.
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Latest Guides
Step-by-step tutorials to boost your DevOps skills
Security Gates
What security gates are and how to add them to CI/CD: policy as code, CVE gates with KEV and EPSS, compliance checks and admission control, with real runs.
Introduction to Packer
Learn HashiCorp Packer 1.16: install it, write HCL2 templates, build AWS AMIs and Docker images, use provisioners and variables, and follow best practices.
Introduction to AWS
A beginner introduction to AWS: how AWS works (accounts, regions, APIs), then IAM, EC2, S3, VPC, RDS, load balancing, Lambda 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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