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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
Terraform
Infrastructure as code
Git
Git and version control for developers
Linux
Linux operating system and distributions
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
Go Is Not Just for CLIs. It Runs the Cloud Native Control Plane
Docker, Kubernetes, etcd, Terraform, Vault, Prometheus, CoreDNS, Caddy, MinIO, CockroachDB: we pulled the real language breakdown of 20 infrastructure projects from GitHub, explain why Go keeps winning the control plane, list where it does not, and build a static cross-compiled HTTP server to show the reason in under 6 MB.
DNS Detective: an Agent That Diagnoses Your Domain by Actually Probing It
We built an agent on DigitalOcean's Serverless Inference that debugs DNS, TLS and email problems the way an engineer does: form a hypothesis, run a real lookup, follow the evidence. It solved a null-MX mystery, an expired certificate, and a broken DNSSEC chain on camera, and one model we tried got disqualified for inventing probe results.
Getting a Row Change Out of Postgres Without Dual-Writing
Your service writes to Postgres and publishes to Kafka, and one day those two disagree. The fix is to make the database the only writer and read changes from its log: the outbox pattern, logical decoding, and the replication-slot failure mode that quietly fills your primary's disk, demonstrated live with real numbers.
Omarchy 4 Makes the Linux Desktop Feel Like a Product, Finally
DHH's Arch-based distro shipped its biggest release in August: a full desktop shell rewrite, sub-minute installs, dual boot, and coding agents treated as system citizens. With an $8M foundation behind it and hardware vendors paying attention, Omarchy is the most serious run at the developer workstation in years.
How Discord Stores Trillions of Messages With a Tiny Team
Discord went from 12 database nodes to 177 to 72, while message volume went from billions to trillions. The interesting part is not the migration to ScyllaDB; it is what they built in front of the database, and what their three worst problems teach anyone running a hot datastore at any scale.
Kubernetes 1.37 Really Can Flag Unused PVCs, but the Viral YAML Is Wrong
A post making the rounds says Kubernetes 1.37 adds an unusedSince field to PVC status. The feature is real and it is genuinely good news for storage bills; the YAML being shared shows an API that does not exist. Here is what KEP-5541 actually shipped, the correct fields, and a working query for "PVCs unused for 30 days".
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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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