config-nginx.text

user www-data;

# number of single-threaded process Nginx will spawn
# Set to # of CPU cores - Nginx won't benefit from anything more than that
worker_processes 4;

pid /var/run/nginx.pid;

# 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;

events {
    # How many clients can be served per worker process
    # max clients = worker_connections * worker_processes
    # max clients is limited by the number of socket connections available on the system (~64k)
    worker_connections 2048;

    # Try to accept as many connections as possible after nginx gets notification about a new connection
    # Warning: may flood worker connections if set too low
    multi_accept on;

    # Optimized to serve many clients with each thread
    use epoll;
}

http {

    # Copy data between one file descriptor to another from within the kernel
    # Faster than doing a read() and a write(), so it's better for performance
    sendfile on;

    # Nginx will send all the headers in one packet
    # Faster than sending them one by one
    tcp_nopush on;

    # Nginx won't buffer the data sent - this is good for small data bursts in real time
    tcp_nodelay on;

    # Disable access logs to increase speed by reducing disk IO
    # AKA, yolo
    access_log off;

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

    # Our timeout for connections in seconds
    keepalive_timeout 10;

    # Number of requests client can make over keep-alive
    keepalive_requests 100000;

    # Allow the server to close connection on non responding client - this will free up memory
    reset_timedout_connection on;

    # Sets the read timeout for the request body from client (seconds)
    client_body_timeout 10;

    # If a client stops responding, free up memory -- default 60
    send_timeout 2;

    # Include possible MIME types for Nginx
    include /etc/nginx/mime.types;

    # Set our default MIME type to be HTML
    default_type text/html;

    # Set the default charset to be UTF-8 in our header
    charset UTF-8;

    # Performance improvements for the previous two explained here http://webmasters.stackexchange.com/questions/18504/character-set-not-specified-in-http-headers-error

    # gzip our data so we reduce the amount of data we need to send
    gzip on;
    
    # disable for IE6 or less
    gzip_disable "msie6";
    
    # enable compression for all requests
    gzip_proxied any;

    # shorter than 1000 bytes won't be compressed
    gzip_min_length 1000;
    
    # gzip compression level (1-9, 9 being the slowest but most compressed)
    # 6 is a good middle ground for us
    gzip_comp_level 6;

    # set the types of data to gzip - feel free to add more
    gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    # cache informations about file descriptors, frequently accessed files
    # can boost performance, but you need to test those values
    open_file_cache max=200000 inactive=20s; 
    open_file_cache_valid 30s; 
    open_file_cache_min_uses 2;
    open_file_cache_errors on;

    ##
    # Virtual Host Configs
    # aka our settings for specific servers
    ##

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