File nginx.conf to use in centos servers

nginx.conf

user  nginx;
worker_processes  1; #2
error_log  /var/log/nginx/error.log;
pid        /run/nginx.pid;
worker_rlimit_nofile 20000;

events {
	worker_connections  10000;
	multi_accept on;
	accept_mutex on;
#	accept_mutex_delay 500ms;
	use epoll;
}


http {
      	client_body_buffer_size 32K;
        client_body_in_single_buffer on;
        client_header_buffer_size 3m;
        client_max_body_size 31m;
        large_client_header_buffers 4 64k;

	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"';

    	access_log  off;

	sendfile on;
	tcp_nodelay on;
	tcp_nopush on;
	aio on;
	directio 4m;

	client_body_timeout   10;
	client_header_timeout 10;
	keepalive_timeout     30;
	keepalive_requests 1000;
	send_timeout          2;
	server_tokens off;
	reset_timedout_connection on;

	#some cache configurations
	open_file_cache max=10000 inactive=20s;
	open_file_cache_valid 60s;
	open_file_cache_min_uses 5;
	open_file_cache_errors off;

	gzip on;
	gzip_comp_level 5;
	gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
	gzip_proxied any;
	gzip_buffers 16 8k;
	gzip_vary on;
	gzip_disable "MSIE [1-6]\.";
	gzip_min_length 1024;

	#Limit connection regarding flooding
	limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
       	limit_conn_log_level notice;
	limit_req_zone $binary_remote_addr zone=req_limit_per_ip:10m rate=15r/s;

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

    	index   index.html index.htm;

	server {
        	listen       80;
        	server_name  localhost;
        	root         /usr/share/nginx/html;

        	location / {
        	}

        	# redirect server error pages to the static page /40x.html
        	#
        	error_page  404              /404.html;
        	location = /40x.html {
        	}

        	# redirect server error pages to the static page /50x.html
        	#
        	error_page   500 502 503 504  /50x.html;
        	location = /50x.html {
        	}
    	}
}