# nginx Configuration File
# http://wiki.nginx.org/Configuration

# Run as a less privileged user for security reasons.
user www www;

# How many worker threads to run;
# "auto" sets it to the number of CPU cores available in the system, and
# offers the best performance. Don't set it higher than the number of CPU
# cores if changing this parameter.

# The maximum number of connections for Nginx is calculated by:
# max_clients = worker_processes * worker_connections
worker_processes 2;

# Maximum open file descriptors per process;
# should be > worker_connections.
worker_rlimit_nofile 8192;

events {
  # When you need > 8000 * cpu_cores connections, you start optimizing your OS,
  # and this is probably the point at which you hire people who are smarter than
  # you, as this is *a lot* of requests.
  worker_connections 8000;
}

# Default error log file
# (this is only used when you don't override error_log on a server{} level)
error_log  logs/error.log warn;
pid        /var/run/nginx.pid;

http {

  # Hide nginx version information.
  server_tokens off;

  # Define the MIME types for files.
  include       /etc/nginx/mime.types;
  default_type  application/octet-stream;

  # Format to use in log files
  log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

  # Default log file
  # (this is only used when you don't override access_log on a server{} level)
  access_log logs/access.log main;

  # How long to allow each connection to stay idle; longer values are better
  # for each individual client, particularly for SSL, but means that worker
  # connections are tied up longer. (Default: 65)
  keepalive_timeout 20;

  # Speed up file transfers by using sendfile() to copy directly
  # between descriptors rather than using read()/write().
  sendfile        on;

  # Tell Nginx not to send out partial frames; this increases throughput
  # since TCP frames are filled up before being sent out. (adds TCP_CORK)
  tcp_nopush      on;

  # Tell Nginx to enable the Nagle buffering algorithm for TCP packets, which
  # collates several smaller packets together into one larger packet, thus saving
  # bandwidth at the cost of a nearly imperceptible increase to latency. (removes TCP_NODELAY)
  tcp_nodelay     off;


  # Compression

  # Enable Gzip compressed.
  gzip on;

  # Enable compression both for HTTP/1.0 and HTTP/1.1 (required for CloudFront).
  gzip_http_version  1.0;

  # Compression level (1-9).
  # 5 is a perfect compromise between size and cpu usage, offering about
  # 75% reduction for most ascii files (almost identical to level 9).
  gzip_comp_level    5;

  # Don't compress anything that's already small and unlikely to shrink much
  # if at all (the default is 20 bytes, which is bad as that usually leads to
  # larger files after gzipping).
  gzip_min_length    256;

  # Compress data even for clients that are connecting to us via proxies,
  # identified by the "Via" header (required for CloudFront).
  gzip_proxied       any;

  # Tell proxies to cache both the gzipped and regular version of a resource
  # whenever the client's Accept-Encoding capabilities header varies;
  # Avoids the issue where a non-gzip capable client (which is extremely rare
  # today) would display gibberish if their proxy gave them the gzipped version.
  gzip_vary          on;

  # Compress all output labeled with one of the following MIME-types.
  gzip_types
    application/atom+xml
    application/javascript
    application/json
    application/rss+xml
    application/vnd.ms-fontobject
    application/x-font-ttf
    application/x-web-app-manifest+json
    application/xhtml+xml
    application/xml
    font/opentype
    image/svg+xml
    image/x-icon
    text/css
    text/plain
    text/x-component;
  # text/html is always compressed by HttpGzipModule


  # This should be turned on if you are going to have pre-compressed copies (.gz) of
  # static files available. If not it should be left off as it will cause extra I/O
  # for the check. It is best if you enable this in a location{} block for
  # a specific directory, or on an individual server{} level.
  # gzip_static on;

  # Protect against the BEAST attack by preferring RC4-SHA when using SSLv3 and TLS protocols.
  # Note that TLSv1.1 and TLSv1.2 are immune to the beast attack but only work with OpenSSL v1.0.1 and higher and has limited client support.
  ssl_protocols              SSLv3 TLSv1 TLSv1.1 TLSv1.2;
  ssl_ciphers                RC4:HIGH:!aNULL:!MD5;
  ssl_prefer_server_ciphers  on;

  # Optimize SSL by caching session parameters for 10 minutes. This cuts down on the number of expensive SSL handshakes.
  # The handshake is the most CPU-intensive operation, and by default it is re-negotiated on every new/parallel connection.
  # By enabling a cache (of type "shared between all Nginx workers"), we tell the client to re-use the already negotiated state.
  # Further optimization can be achieved by raising keepalive_timeout, but that shouldn't be done unless you serve primarily HTTPS.
  ssl_session_cache    shared:SSL:10m; # a 1mb cache can hold about 4000 sessions, so we can hold 40000 sessions
  ssl_session_timeout  10m;

  # This default SSL certificate will be served whenever the client lacks support for SNI (Server Name Indication).
  # Make it a symlink to the most important certificate you have, so that users of IE 8 and below on WinXP can see your main site without SSL errors.
  #ssl_certificate      /etc/nginx/default_ssl.crt;
  #ssl_certificate_key  /etc/nginx/default_ssl.key;

  include sites-enabled/*;
}