Linux systems fundamentals in practice — MariaDB data directory recovery, passwordless SSH backup automation, Tomcat WAR deployment, and a two-layer port conflict diagnosis involving Sendmail and iptables.

Linux systems fundamentals in practice — SELinux on CentOS/RHEL, cron automation, passwordless SSH, and Ansible installation across multiple servers.

Linux systems fundamentals in practice — non-interactive users, temporary account expiry, SSH root lockdown across multiple servers, and file permission management.

Full breakdown of hardening Nginx, PHP-FPM, and MySQL on Ubuntu — TLS configuration, security headers, file permissions, and what it actually takes to get an A+ on SSL Labs.

A practical breakdown of containerizing and deploying applications on AWS with proper secrets management — architecture decisions, IAM patterns, and what actually works in production.

A breakdown of building a CLI tool to audit AWS Security Groups at scale — architecture decisions, failure modes, and what production-ready security tooling actually looks like.

A full breakdown of building a push-to-deploy pipeline on Kubernetes — Flask webhook orchestration, RBAC, network policy isolation, blue-green deployments, and automated rollback.

A practical reference for configuring NGINX on Ubuntu 22.04 on AWS EC2 — security groups, file permission models, the full 403 debugging chain, and what production-ready actually looks like for a web server setup.