Nginx Rewrite Rules, Anti-Hotlinking, Static/Dynamic Separation, and Keepalived High‑Availability Configuration Guide

1. Nginx Rewrite Rules – The rewrite directive rewrites a URL to another URL using the syntax rewrite <regex> <replacement> [flag]; . Common flags include last , break , redirect (302), and permanent (301). Example configuration to redirect www.dbspread.com to www.dbspread.com/new.index.html is shown.

2. Nginx Anti‑Hotlinking – By defining a location ~* \.(rmvb|jpg|png|swf|flv)$ block with valid_referers and returning 403 for invalid referers, hotlinking of media files can be prevented.

3. Nginx Static/Dynamic Separation – Static resources (e.g., images, CSS, JS) are served from a dedicated directory with long expires headers, while dynamic requests are proxied to Tomcat back‑ends. The configuration includes proxy_set_header directives, upstream definitions, and caching settings.

4. Keepalived High‑Availability – Keepalived provides VRRP‑based failover for Nginx. The guide details installing Keepalived (download, extract, compile), creating /etc/keepalived/keepalived.conf , defining global_defs , vrrp_script for health checks, and vrrp_instance with virtual IP 192.168.152.200 . Master and backup node configurations are provided.

5. Supporting Scripts – A shell script /usr/local/src/check_nginx_pid.sh checks if Nginx is running and restarts it; if restart fails, it kills Keepalived to trigger VIP takeover.

6. Deployment Steps – After installing Keepalived and configuring Nginx, copy the Keepalived config to /etc/keepalived , start both services, verify VIP failover by stopping the master node, and confirm that the backup assumes the master role. Finally, map the virtual IP to the domain in /etc/hosts for testing.