Nginx configuration file (used on Amazon Linux)

nginx.conf

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user  nginx;
# This number should be, at maximum, the number of CPU cores on your system.
# (since nginx doesn't benefit from more than one worker per CPU.)
worker_processes 4;

# Number of file descriptors used for Nginx. This is set in the OS with 'ulimit -n 200000'
# or using /etc/security/limits.conf
worker_rlimit_nofile 200000;

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

pid        /var/run/nginx.pid;


events {
    # Determines how many clients will be served by each worker process.
    # (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;

    # essential for linux, optmized to serve many clients with each thread
    use epoll;

    # Accept as many connections as possible, after nginx gets notification about a new connection.
    # May flood worker_connections, if that option is set too low.
    multi_accept on;
}


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

    # Caches information about open FDs, freqently accessed files.
    # Changing this setting, in my environment, brought performance up from 560k req/sec, to 904k req/sec.
    # I recommend using some varient of these options, though not the specific values listed below.
    open_file_cache max=20000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
                      
    # Hide server tokens (version number)
    server_tokens off;

    # Buffer log writes to speed up IO, or disable them altogether
    #access_log /var/log/nginx/access.log main buffer=16k;
    access_log off;

    # Sendfile copies data between one FD and other from within the kernel.
    # More efficient than read() + write(), since the requires transferring data to and from the user space.
    sendfile        on;

    # Tcp_nopush causes nginx to attempt to send its HTTP response head in one packet,
    # instead of using partial frames. This is useful for prepending headers before calling sendfile,
    # or for throughput optimization.
    tcp_nopush on;

    # don't buffer data-sends (disable Nagle algorithm). Good for sending frequent small bursts of data in real time.
    tcp_nodelay on;

    # Timeout for keep-alive connections. Server will close connections after this time.
    keepalive_timeout 30;

    # Number of requests a client can make over the keep-alive connection. This is set high for testing.
    keepalive_requests 100000;

    # allow the server to close the connection after a client stops responding. Frees up socket-associated memory.
    reset_timedout_connection on;

    # send the client a "request timed out" if the body is not loaded by this time. Default 60.
    client_body_timeout 10;

    # If the client stops reading data, free up the stale client connection after this much time. Default 60.
    send_timeout 2;

    # Compression. Reduces the amount of data that needs to be transferred over the network
    gzip on;
    gzip_static on;
    gzip_http_version 1.0;
    gzip_min_length 10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml;
    gzip_disable "MSIE [1-6]\.";

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
}