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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
Git
Git and version control for developers
Terraform
Infrastructure as code
Linux
Linux operating system and distributions
Networking
Networking concepts and practices
Bash
Bash scripting and command line
// 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
Datadog Alternatives in 2026: 12 Tools, Their Real Prices, and What 300 GB of Logs Costs on Each
We read the pricing page of Datadog and 12 alternatives on the same day and priced one workload on each: 300 GB of logs a month. Datadog with standard indexing of every event is $780 to $1,155 a month; the alternatives we could price run from about $19 to $180. Here is each tool, who it suits, and the catch on its pricing page.
DevOps Interviews Now Test How You Decide. How to Practice Situational Questions
Fewer interviewers ask what a Kubernetes Service is. More of them describe a broken system and ask what you do first. Here is what they grade, five worked scenarios with weak and strong answers, and a way to practice making the call.
How YouTube, Slack and GitHub Shard MySQL: We Built the Vitess Pattern on Five Servers and Measured What It Costs
YouTube built Vitess, and Slack and GitHub use it for their largest MySQL workloads. We built the same primitives over five real MySQL servers and measured them: a scatter read took 4 shard queries and got a quarter of the throughput, every simulated half-finished cross-shard transfer lost money, an online split lost no rows, and a hot channel stayed hot at 128 shards.
Ubuntu 26.10 Moves cp, mv and rm to Rust. We Ran 162 Shell Commands Through GNU and uutils to See What Changes
Ubuntu 26.10 ships on October 15 with Rust coreutils for every tool. On the same system, 150 of our 162 shell test cases gave byte-identical results with GNU and uutils. The other 12 come down to four changes that can break a script (GNU detection, cut -c, timeout -s KILL, base64 -d) and five error messages.
DigitalOcean Agent Droplets: When the $50 Plan Pays Off
Agent Droplets is a prepaid discount on DigitalOcean Managed Agents, not a server. We priced our real agent runs from a real invoice to find where the $50 and $200 plans start to save money, and found a rounding rule that made our runs cost more than the token math.
OpenSSH 10.6 Refuses DOMAIN\user and Weakens ssh -C. We Measured Both
OpenSSH 10.6 came out on October 6. It refuses usernames with a backslash or a dollar sign before it connects, which breaks ssh, scp, rsync, git and Ansible logins written as CORP\alice. It also cuts ssh -C to Huffman coding only, so a 32 MiB log now compresses to 21 MiB instead of 3.7 MiB. We built 10.5 and 10.6 side by side and tested 13 ways of passing a username, 4 kinds of data and 8 SSH clients.
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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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