thumbor_nginx.conf

proxy_cache_path    /var/cache/nginx/sub.example.com levels=1:2 keys_zone=media-cache:8m max_size=100m inactive=600m;
proxy_temp_path     /var/cache/nginx/tmp/media;

server {
    listen 80;
    server_name sub.example.com;
    client_max_body_size 20m;
    access_log  /var/log/nginx/sub.example.com.access.log;
    error_log   /var/log/nginx/sub.example.com.error.log;

    location / {
        proxy_pass http://localhost:8888;
        proxy_redirect off;
        proxy_set_header Host $host;

        proxy_cache media-cache;
        proxy_cache_valid  200 302 60m;
        proxy_cache_valid  404     1m;

    }
}