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.

From kernel panics to parent process deception — a practical account of building real-time container security tooling with eBPF.

A practical breakdown of running your own Git server on AWS EC2 — Nginx reverse proxy, MySQL, SSL, automated backups, and every error worth documenting.

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.