Mine

user  nginx;
worker_processes  8;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;
worker_rlimit_nofile 50000;

events {
    use epoll;
    worker_connections  20000;

}


http {

    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" "$host"';

    access_log  /var/log/nginx/access.log  main;
    error_log /var/log/nginx/error.log;
    log_not_found on;
    sendfile        on;
    tcp_nopush     on;
    tcp_nodelay         on;
    keepalive_timeout  15;

    upstream rotator {
        server 127.0.0.1:8185 fail_timeout=5s max_fails=1;
        server 127.0.0.1:8186 fail_timeout=5s max_fails=1;
        server 127.0.0.1:8187 fail_timeout=5s max_fails=1;
        server 127.0.0.1:8188 fail_timeout=5s max_fails=1;
            }


        ###general proxy configuration###
    proxy_send_timeout         120;
    proxy_read_timeout         120;
    proxy_set_header   Host             $host;
    proxy_set_header   X-Real-IP        $remote_addr;
    proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_buffer_size          256k;
    proxy_buffers              8 128k;
    proxy_busy_buffers_size    256k;
    proxy_temp_file_write_size 256k;
    proxy_ignore_client_abort on;
    proxy_redirect   off;
        ###
    gzip off;
    gzip_buffers 4 16k;
    gzip_comp_level 7;
    gzip_proxied any;
    gzip_types text/plain text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites/*.conf;
}