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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.
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Git and version control for developers
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Bash
Bash scripting and command line
Networking
Networking concepts and practices
// exercises
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
Gate Your Terraform Plans: Rules Decide, the Model Explains
A pull request says "3 to add, 1 to change, 1 to destroy" and everyone approves it. This is a GitHub Action that reads the plan JSON, fails the job on selected changes that risk data loss or public exposure, and uses DigitalOcean inference only to write the comment. Measured against twenty labelled plans, including the four it misses.
How Netflix Ships a Third of the Internet: The CDN They Had to Build
At its 2015 peak Netflix was 37% of North American downstream traffic, and almost none of it came from a commercial CDN. Open Connect is a cache hierarchy built on one asymmetry: Netflix knows tonight what people will watch tomorrow. Here is how the appliances, the nightly fill, the BGP steering and the 800 Gb/s FreeBSD boxes fit together, a runnable comparison of push fill against pull-through caching, and what it teaches anyone running a cache.
In-App, Email and Push From One Event
An order ships. The user wants a badge in the app, a digest email later, no push at all, and their own webhook endpoint pinged. The design that handles that without duplicates: an outbox keyed by event, user and channel, preferences evaluated at send time, digest windows, and provider feedback wired back in. With a runnable model and a build-or-buy verdict.
Meta Says Every Muse User Gets Their Own VM
Meta says its new consumer agent runs on a dedicated cloud VM per person, with a second agent that has to approve anything leaving that machine and a credential store the agent can use but never read. Those are three infrastructure decisions you face too. Here is what each one defends against, what it costs to build, and a runnable model of the broker, including the injected page that tries to walk out with a token.
How Stripe Avoids Double-Charging Anyone
A payment request times out. Did the charge happen? Stripe answers that question with idempotency keys, and the design behind them is more than a cache of responses: locked key rows, recovery points, and a rule about which calls can be retried. Here is the design, a working Postgres implementation, the run where our own version double-created rides, and the constraint that caught it.
Who Owns the State File, and Other Questions That Decide Your Week
Most Terraform pain is not HCL. It is state: who is allowed to write it, how it is split, how you find out it no longer matches reality, and how a plan gets reviewed before it applies. Four decisions, a real drift run, and the tooling that exists for each.
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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.
// tools
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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