NGINX Cache Cluster

nginx.conf

error_log logs/error.log;

events {
    worker_connections 512;
}

worker_processes 4;

http {
    
    proxy_cache_path /var/lib/nginx/cache levels=1:2 keys_zone=default_cache:10m max_size=2g inactive=120m use_temp_path=off;
    proxy_cache_key "$scheme$request_method$host$request_uri";
    proxy_cache_valid 200 302 60m;

    upstream cache {
        hash $scheme$proxy_host$request_uri consistent;
        server <CACHE-SERVER-1>:8080;
        server <CACHE-SERVER-2>:8080;
        server <CACHE-SERVER-3>:8080;
    }

    upstream origin {
        hash $scheme$proxy_host$request_uri consistent;
        server <BACKEND-SERVER-1>:80;
        server <BACKEND-SERVER-2>:80;
        server <BACKEND-SERVER-3>:80;
        server <BACKEND-SERVER-4>:80;
    }

    server {
        listen 80;

        location / {
            proxy_buffering on;
            proxy_pass http://cache;
        }
    }


    server {
        listen 8080;
    
        location / {
            proxy_cache default_cache;
            proxy_buffering on;
            proxy_ignore_headers Expires;
            proxy_ignore_headers X-Accel-Expires;
            proxy_ignore_headers Cache-Control;
            proxy_ignore_headers Set-Cookie;
            
            proxy_hide_header X-Accel-Expires;
            proxy_hide_header Expires;
            proxy_hide_header Cache-Control;
            proxy_hide_header Pragma;

            proxy_set_header Host <HOSTNAME>;
            
            add_header X-Proxy-Cache $upstream_cache_status;
            proxy_pass http://origin;
        }
    }

}