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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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Docker
Docker articles, tutorials, and guides on DevOps Daily covering containers, images, Dockerfiles, Compose, volumes, networking, and production best practices.
Kubernetes
Container orchestration and management
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Infrastructure as code
Git
Git and version control for developers
Linux
Linux operating system and distributions
Networking
Networking concepts and practices
Bash
Bash scripting and command line
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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
The No-Backend Backend: Neon Data API, RLS and 27 Attacks
A team task board with no server code: static React, Neon Auth, and the Neon Data API with row-level security as the only guard. A signed-in attacker tried 27 ways in. What held, the four mistakes that would have let her through, and the 15-minute gap.
CI Passed 6 of 6 Migrations. A Neon Branch of Production Passed 1
How to test Postgres migrations before production: branch production on Neon in seconds, run each migration while an app keeps reading and writing, and gate on errors, failed queries, lock stalls and lost rows. The six migrations that passed on our fixture database failed five times on the branch.
Your Semantic Cache Answers the Question Next Door
We put a semantic cache in front of an ops assistant on DigitalOcean Serverless Inference and replayed 288 hand-labelled questions through six embedding models. At the threshold that cut the bill by about 30 percent, about one hit in three was the answer to a different question. Someone asking how to undo a pushed commit got the instructions for an unpushed one.
Cloudflare Freed 100 TB of RAM From Its Hash Rings. Your Proxy May Have the Opposite Problem
Cloudflare got back 100 TB of RAM partly by cutting 90% of the points on its consistent hash rings. We measured the other end of the same curve: a million keys through nginx and HAProxy to 100 backends, and Envoy rebuilt from its source. The busiest server ranged from 1.05x to 2x its fair share, and the points per server explained most of it.
We Hid 96 Instructions in the Logs an Ops Agent Reads. Here Is What Stopped Them.
An on-call agent reads logs and tickets that other people write. We planted 96 prompt injections in that text and measured six defences on DigitalOcean Serverless Inference. One paragraph in the system prompt cut the attack rate from 35 percent to 4. Delimiters on their own did nothing we could measure. A check outside the model stopped every forbidden action, and still missed the secrets the agent wrote into its own reports.
We Put Localhost on the Internet and Watched Who Turned Up
A Cloudflare quick tunnel gives you a public URL for a port on your laptop in one command and no account. We ran one in front of a server that logs everything and answers nothing, to find out how long it takes the internet to find you, and what the thing actually costs.
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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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