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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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Infrastructure as code
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
Neon Realtime, Measured: Live SQL Queries Replace the LISTEN/NOTIFY Layer We Built by Hand
Neon Realtime turns a SQL query into a live subscription. We rebuilt our hand-made LISTEN/NOTIFY layer on it as a live order board and measured it on a real Neon project: 48,600 writes at up to 100 per second, which queries are re-sent in full on every write, what a reconnect delivers, scale to zero, and 14 attempts to tamper with a sealed query.
SOC 2 Evidence From GitHub and Terraform, and the Part That Still Needs a Person
We pointed a small evidence collector at a repository whose main branch had a strict ruleset. The ruleset passed and three change-management controls failed. Here is which SOC 2 evidence you can pull from GitHub and Terraform, which still needs a person, and ten ways an evidence script can pass a control without evidence.
Postgres 19 Slipped to November: Every Pulled Feature and Why
PostgreSQL 19 now ships on 19 November, and 13 items left its release notes after beta 1. Here is each pulled feature with the reason from its revert, what to use instead, a script that finds beta-era code that depends on them, and why "AI found too many bugs" is only part of the story.
Let's Encrypt Goes to 64-Day Certificates: When Does Your ACME Client Actually Renew?
Let's Encrypt moves to 64-day certificates on 10 February 2027, and its staging environment already issues them. We issued real 64-day staging certificates with certbot, acme.sh and lego and recorded when each one renews. The ARI clients renewed or scheduled their renewal around day 42. acme.sh 3.0.7 with --days 80 scheduled its renewal for day 79, 15 days after the certificate expired, and upgrading to 3.1.6 fixed that at the next check.
Page, Ticket or Ignore: Is the Cheap Model Good Enough for Alert Triage?
We gave six models and two model routers on DigitalOcean Serverless Inference one written on-call policy and 200 alerts, three times each. A model at $0.16 per 1,000 alerts made every call the same way as one at $1.64, and the general router picked the expensive one. The real differences were latency, missed pages and a bug in our own test data that the models caught.
DORA Metrics From Git History: The Definition Picks Your Tier
We computed deployment frequency, lead time, change failure rate and recovery time from one year of Kubernetes, uv, Go and Prometheus history, once per common definition. The definition alone moved every project across two or three DORA performance levels, and the merge button decides whether Git still knows when the work started.
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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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