devops 
Docker 101: Commands, Troubleshooting & Debugging — Intermediate to Advanced
A deep-dive into Docker's essential commands, real-world troubleshooting scenarios, and advanced debugging techniques for engineers who want to move beyond the basics.
Linux Troubleshooting and Debugging Guide
A comprehensive Linux troubleshooting guide covering boot issues, CPU and memory problems, disk I/O, networking, services, permissions, and every essential debugging command with practical examples.
Self-Hosting ntfy: Push Notifications Under 50MB RAM
A complete guide to setting up ntfy on a 1GB Debian Lightsail instance with Nginx, Let's Encrypt, WebSocket support, and Jenkins CI integration.
Building a Production Kubernetes Cluster on Bare Metal
A complete walkthrough for setting up a 3-node on-premise Kubernetes v1.35 cluster on Ubuntu 24.04 with Calico CNI, MetalLB, NGINX Ingress, and local-path storage.
Kubernetes Troubleshooting Guide for Operators and Administrators
A comprehensive, production-focused Kubernetes troubleshooting guide covering pods, services, storage, nodes, networking, RBAC, and control plane issues with runbook-style diagnostic steps and resolution strategies.
Nginx 101: how it actually works (from a newbie's perspective)
A ground-up explanation of nginx config files, server blocks, reverse proxying, SSL, and everything in between. Written after spending way too long debugging sites-enabled.
High-Level System Design: A Complete Guide for Engineers
A comprehensive guide to High-Level System Design covering design principles, constraints, scalability patterns, databases, caching, messaging, load balancing, and how to systematically approach and solve any system design problem.