Xenforo forum (cloudflare enabled) nginx.conf for virtual hosting domains from /etc/nginx/domains/ | handles 15,000 Unique Visitors per day

nginx.conf

user nginx nginx;

worker_processes auto; #some last versions calculate it automatically

# number of file descriptors used for nginx
# the limit for the maximum FDs on the server is usually set by the OS.
# if you don't set FD's then OS settings will be used which is by default 2000
worker_rlimit_nofile 100000;

# only log critical errors
error_log /var/log/nginx/error.log;

# provides the configuration file context in which the directives that affect connection processing are specified.
events {
    # determines how much clients will be served per worker
    # max clients = worker_connections * worker_processes
    # max clients is also limited by the number of socket connections available on the system (~64k)
    worker_connections 4000;

    # optimized to serve many clients with each thread, essential for linux -- for testing environment
    use epoll;

    # accept as many connections as possible, may flood worker connections if set too low -- for testing environment
    multi_accept on;
}

http {
    include mime.types;
    default_type  application/octet-stream;
    types_hash_bucket_size 64;
    server_tokens off;
    access_log off;

    client_max_body_size 150M;
    client_body_buffer_size 200M;
    
        #Cloudflare
	# - IPv4
        set_real_ip_from 173.245.48.0/20;
	set_real_ip_from 103.21.244.0/22;
  	set_real_ip_from 103.22.200.0/22;
  	set_real_ip_from 103.31.4.0/22;
  	set_real_ip_from 141.101.64.0/18;
   	set_real_ip_from 108.162.192.0/18;
  	set_real_ip_from 190.93.240.0/20;
  	set_real_ip_from 188.114.96.0/20;
   	set_real_ip_from 197.234.240.0/22;
 	set_real_ip_from 198.41.128.0/17;
   	set_real_ip_from 162.158.0.0/15;
  	set_real_ip_from 104.16.0.0/12;
  	set_real_ip_from 172.64.0.0/13;
  	set_real_ip_from 131.0.72.0/22;
        # - IPv6
	set_real_ip_from 2400:cb00::/32;
  	set_real_ip_from 2606:4700::/32;
  	set_real_ip_from 2803:f800::/32;
  	set_real_ip_from 2405:b500::/32;
  	set_real_ip_from 2405:8100::/32;
  	set_real_ip_from 2a06:98c0::/29;
  	set_real_ip_from 2c0f:f248::/32;
        real_ip_header CF-Connecting-IP;
    
    # allow the server to close connection on non responding client, this will free up memory
    reset_timedout_connection on;

    # request timed out -- default 60
    client_body_timeout 10;

    # if client stop responding, free up memory -- default 60
    send_timeout 2;

    # server will close connection after this time -- default 75
    keepalive_timeout 30;

    # copies data between one FD and other from within the kernel
    # faster than read() + write()
    sendfile on;

    # send headers in one piece, it is better than sending them one by one
    tcp_nopush on;
    # don't buffer data sent, good for small data bursts in real time
    tcp_nodelay on;

    fastcgi_buffer_size  16k;
    fastcgi_buffers 16  16k;
    types_hash_max_size 2048;
    server_names_hash_bucket_size 64;

    ## Load virtual host conf files. ##
    include /etc/nginx/domains/*;
}