Linux Firewall Configuration: UFW and iptables Practice
A practical guide to the three Linux firewall tools - UFW, iptables, and nftables - covering default policies, common rules, port allow-lists, and brute-force rate limiting.
Security Hardening
AI prompt template and resources for Security Hardening
Website Backup Strategy & Automation Script
Automated website file and database backup script with local retention and remote S3/object storage sync.
SSL Certificate One-Click Setup (Certbot)
One-click SSL certificate setup with Certbot and Let's Encrypt — single domain, wildcard, auto-renewal, and troubleshooting.
Server Initial Security Hardening Script
A complete server security hardening script — non-root user, SSH lockdown, UFW firewall, Fail2Ban, and auto-updates.
Security Headers Configuration Guide
HTTP security headers are the first line of defense against XSS, clickjacking, MIME sniffing, and other web attacks.