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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
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
Opsville: A Free Pixel-Art DevOps Town in Your Browser
Opsville is a free browser game. Walk a pixel-art town, fix eight DevOps districts with our simulators and quizzes, and see how we built it.
Build an Everyday AI Assistant with DigitalOcean Inference
Build Daylight, a personal assistant that turns a brain dump into a realistic plan, adapts when your day changes, and saves the changes you accept.
cgroup v2 memory.high Throttles, memory.max Kills: Measured on a Host Without Swap
We ran one allocating workload under memory.max, memory.high and both on a Linux 6.8 host with no swap. memory.max killed it in under half a second. memory.high did not kill it: new allocations waited, once per 64-page batch at best and once per page next to a busy neighbour on the same CPU. Here are the numbers, the kernel formula behind them, and what systemd, Docker and Kubernetes write.
Alpine OpenSSH Password Bypass (CVE-2026-123158): Check and Fix
Alpine sshd without PAM could let an attacker into accounts that have no password. Check one host or all your containers, then upgrade and restart sshd.
OpenTelemetry Collector Custom Builds: 6.5x Smaller, and What Resource Detectors Cost at Startup
We built a small Collector with ocb and started it next to the contrib release on a droplet, in two network namespaces and on a Raspberry Pi, 5 times per case. The custom build is 6.5x smaller and holds under a quarter of the memory. Cloud detectors for clouds the host is not on held startup for the full 5 s timeout, even on another cloud, and one detector stopped the Collector from starting at all.
An Empty resources: {} Makes Kubernetes 1.34 to 1.36 Pods BestEffort
An empty pod-level block makes a pod with requests and limits BestEffort on Kubernetes 1.34 to 1.36. We measured what changes on the node, and what does not.
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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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