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Nginx Rate Limiting for Public API Endpoints
limit_req zones, burst settings, and returning 429 without starving legitimate Next.js traffic.
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Fail2ban SSH Hardening on Ubuntu Servers
Reduce brute-force noise with Fail2ban jails, whitelist IPs, and sensible ban durations.
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Log Rotation for Nginx and Journald on Ubuntu
Keep disk usage stable with logrotate, journald limits, and centralized shipping options.
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SSL and TLS Hardening for Nginx in 2024
Modern cipher suites, HSTS, OCSP stapling, and certificate chain completeness for public sites.
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Troubleshooting 502 Bad Gateway Errors in Nginx
Systematic causes of Nginx 502 errors—upstream crashes, ports, timeouts—and how to fix them quickly.
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Certbot Auto-Renewal with Nginx on Linux
How Let's Encrypt renewal works on Nginx hosts, dry-run testing, and alerts before certificates expire.
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UFW Firewall Rules for Ubuntu Web Servers
A minimal UFW ruleset for public web servers: SSH, HTTP, HTTPS, and when to restrict admin ports.
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