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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
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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
Base64 Explained: 3 Bytes In, 4 Characters Out, Zero Secrecy
Base64 turns 3 bytes into 4 characters and hides nothing. See it in Kubernetes Secrets and JWTs, measure the 33% overhead, and fix the bugs it causes.
GitLab.com's 60-Requests-an-Hour Limit Is Live, and the Headers Won't Warn You
We sent anonymous requests to GitLab.com until the new per-IP limit blocked us. It depended on which project we asked for, the successful responses never mentioned it, and Retry-After was wrong in both directions. Here is what we measured and how to find the anonymous calls in your CI before GitLab does.
15 Minutes to 5: What Happens When You Move iOS CI From M1 to M4
The Wikipedia iOS app's build and 503 unit tests took a median 15.4 minutes on GitHub's M1 runner and 5.6 minutes on an M4. We split the time by phase, priced each run, and checked whether a bigger Mac is worth it.
Moving Authorization Out of Your App Code: If-Statements vs Cerbos vs SpiceDB, Measured
We built one permission model as if-statements, as Cerbos policies and as a SpiceDB relationship graph, grew it through roles, teams, sharing and a late contractor rule, and checked 84 hand-written decisions at every step. Here is what each design cost in latency, in list queries and in lines of code.
LiteLLM 1.107.0 Was Built From a Lookalike Fork: What PyPI Provenance Can and Cannot Tell You
The poisoned LiteLLM release came out of the real release pipeline, fed from a fork one hyphen away. We measured what a PyPI attestation would have shown, what the Docker image provenance showed, and how many of the 1,000 most downloaded PyPI projects publish attestations at all: 39%.
Why Your GitHub Actions Bill Keeps Growing, and What Each Fix Saves
Per-job rounding, macOS minutes at ten times the Linux price, re-runs and storage add up quietly. We measured where one repository's minutes went in 30 days, then ran a mobile pull request pipeline 34 times on GitHub-hosted runners and on Bitrise Build Hub to see what faster machines change in time and money.
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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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