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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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Git and version control for developers
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Linux
Linux operating system and distributions
Networking
Networking concepts and practices
Security
Application and infrastructure security
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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 Anonymized Branches: Mask the Columns, Then Scan the Rest
We gave a Neon anonymized branch masking rules for every PII column of a 20,000-user table. The masking replaced the values in those columns, and all 20,000 original emails were still readable elsewhere on the branch: in order copies, JSON payloads, support tickets, and an audit table that the masking run itself filled. Here is the scanner we use as a CI gate, and the rules it took to pass it.
eMudhra CA Compromise: Two Roots to Remove, and Dropping Comodo AAA Broke 1 of 16,125 Chains
Browsers blocked the compromised eMudhra TLS intermediates in hours, but images and runtimes read their own trust stores. We tested 34 stores, real curl, Python, Node.js and Go clients, and the chains that the top 20,000 sites send. Debian had to remove two roots because of a Sectigo cross-sign. Removing Comodo AAA broke 1 of 16,125 chains in our OpenSSL test.
Docker Build Cache on Ephemeral CI Runners: inline, registry and local, Measured
A fresh CI runner starts with no BuildKit cache. We rebuilt a real multi-stage Node service on a new builder every time, with no cache, inline, registry min and max, and a local cache directory, and measured cold builds, a one-line change, a dependency bump, the export cost and the cache size.
How Much Memory Does a CI Build Need? Five Real Builds at 2, 4 and 8 GB
We ran five real open-source builds inside 2, 4 and 8 GB memory limits. Four fit in 2 GB. The cgroup counter overstated most of them, and the one that failed was a Vite build that also runs a full type check. Every script is in the post.
Terraform 1.17's -minimal-refresh: 202 API Calls Down to Zero, and the Drift Goes Quiet Too
Terraform 1.17 can skip the refresh for every resource you did not change. We measured it on 202 real DigitalOcean resources: API calls went from 202 to 0 and plan time halved, and then we broke three records behind its back to see what it stops noticing.
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.
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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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