DevOps Guides & Interview Prep
Practical guides on Linux, Git, Docker, Kubernetes, Terraform, Jenkins, Ansible, and AI Engineering - written for engineers who learn by doing.
- The ShellGenius Certificate of Completion: What It Takes to Earn It
- 50 Linux Commands Every DevOps Engineer Must Know
- How to Practice Linux Online for Free (No Installation Required)
- Docker Debugging Case Study: Tracing a Container Crash in Production
- RHCSA and LPIC-1 Exam Prep: A Hands-On Study Plan for 2026
- Git Rebase vs Merge: When to Use Each (With Real Examples)
- SRE Interview Prep: Linux Troubleshooting Questions You'll Actually Face
- Linux Cron Jobs: A Complete Guide to Task Scheduling
- LVM Explained: Logical Volume Management for Linux Admins
- systemd Deep Dive: Units, Targets, Journals, and Troubleshooting
- Bash Scripting for DevOps: Variables, Loops, Functions, and Error Handling
- Linux Networking Commands for Ops and SRE
- Linux Server Security Hardening: A Practical Checklist
- Bash Scripting Interview Questions: What SRE and DevOps Roles Actually Ask
- Linux OOM Kill Forensics: Tracing a Production Memory Crisis
- Disk Full Production Incident: Finding Hidden Space Usage
- Docker Compose for Production: A Practical Configuration Guide
- Docker Networking Explained: Bridge, Host, Overlay, and Custom Networks
- Docker Volumes and Bind Mounts: Managing Persistent Data
- Multi-Stage Docker Builds: Smaller Images, Faster Deploys
- Docker Interview Questions: What Employers Actually Ask in 2026
- Docker Registry Incident: Fixing a Broken Private Registry in Production
- Docker Networking Incident: Microservices That Cannot Talk to Each Other
- Git Branching Strategies: GitFlow vs Trunk-Based Development
- Git Hooks: Automate Code Quality Checks Before Every Commit
- Git Cherry-Pick: Applying Specific Commits Across Branches
- Git Bisect: Finding the Commit That Broke Your Build
- Git Stash: Managing Work in Progress Without Committing
- Git Interview Questions: What Senior DevOps and SRE Roles Actually Ask
- Git Disaster Recovery: Undoing Mistakes and Recovering Lost Work
- Monorepo Migration Case Study: Moving 8 Repos Into One Without Losing History
- Linux FAQ: Learning, Commands, Careers, and Hands-On Practice
- Docker FAQ: Images, Containers, Learning, and Real-World Practice
- Git FAQ: Commits, Branches, Undoing Changes, and Learning Git
- kubectl Commands You Actually Use: A Production Troubleshooting Playbook
- CrashLoopBackOff and Pending Pods: A Systematic Kubernetes Debugging Guide
- Deployment vs StatefulSet vs DaemonSet: Choosing the Right Kubernetes Controller
- Kubernetes Service and DNS Debugging: From Selector to EndpointSlice
- Kubernetes RBAC Least Privilege: Roles, Bindings, and Safe Permission Testing
- Kubernetes Incident: A Readiness Probe Turned a Safe Rollout Into an Outage
- Kubernetes NetworkPolicy Incident: The Checkout API Timed Out After a Security Change
- Kubernetes Interview Questions for DevOps, SRE, and Platform Engineers
- Kubernetes FAQ: Learning, Careers, Certifications, and Real-World Use
- Terraform State Commands You Will Actually Use: A Safe Operations Guide
- Terraform count vs for_each: Stable Resource Addresses and Safe Refactors
- Terraform Workspaces vs Directories: Choosing an Environment Strategy
- Terraform Import Workflow: Adopt Existing Infrastructure Without Downtime
- Terraform lifecycle Patterns: create_before_destroy, prevent_destroy, ignore_changes, and replace_triggered_by
- Terraform Stale State Lock Incident: Unblocking a Production Deploy Safely
- Terraform Drift Case Study: The Console Change That Broke a Production Plan
- Terraform Interview Questions and Answers for DevOps and Platform Engineers
- Terraform FAQ: Learning, Careers, Certification, State, and Production Use
- Jenkins Declarative vs Scripted Pipeline: Syntax, Tradeoffs, and Examples
- Jenkins Interview Questions for DevOps Engineers: Scenario-Based Answers
- Jenkins FAQ: Learning, Careers, Pipelines, and Production Use
- Jenkins Incident Case Study: The Green Pipeline That Shipped Failing Tests
- Jenkins Case Study: A Stale Workspace Shipped the Wrong Artifact
- Jenkins post Blocks Explained: always, success, failure, unstable, and cleanup
- Parallel Jenkins Pipeline Stages: Faster Builds Without Race Conditions
- Jenkinsfile Best Practices for Reliable Production Pipelines
- Jenkins Credentials in Pipelines: Safe Binding Patterns and Common Leaks
- Running Local LLMs with Ollama: A Practical Operations Guide
- Debugging RAG Pipelines: Embeddings, ChromaDB, Qdrant, and Retrieval Evidence
- MLflow and DVC Together: A Reproducible Machine Learning Workflow
- Secure Terminal AI Agents with Tool Allowlists, Approval Gates, and Audit Logs
- LLM Serving Observability: TTFT, Token Accounting, Batching, and Fallbacks
- AI Agent Incident Case Study: Prompt Injection Exposed a Deployment Token
- RAG Incident Case Study: A Stale Vector Index Invented a Refund Policy
- AI Engineering and LLMOps Interview Questions: Scenario-Based Answers
- AI Engineering and LLMOps FAQ: Learning, RAG, Agents, and Production
- Ansible Inventory and Variable Precedence: A Practical Guide
- Writing Idempotent Ansible Playbooks with Honest Check Mode
- Ansible Handlers and Jinja2 Templates for Safe Configuration Changes
- Ansible Roles and Vault: Reusable Automation Without Secret Sprawl
- Production Ansible: Rolling Updates, Dynamic Inventory, and CI Guardrails
- Ansible Incident Case Study: The Handler That Never Restarted the Service
- Ansible Case Study: A Rolling Update Took Down the Entire Web Tier
- Ansible Interview Questions for DevOps Engineers: Scenario-Based Answers
- Ansible FAQ: Learning, Automation, Security, and Production Use