title: Nginx with Ubuntu and Rails on Digital Ocean
body: <p>I am trying to get nginx to work with a rails app, but nginx wont start after installation and changing its config file.</p>
  
  <p>Here is the output its giving me:</p>
  
  <pre><code>nginx: [emerg] could not build the types_hash, you should increase either types_hash_max_size: 1024 or types_hash_bucket_size: 32
  nginx: configuration file /etc/nginx/nginx.conf test failed
  </code></pre>
  
  <p>And here is my <code>nginx.conf</code> file:</p>
  
  <pre><code># This is example contains the bare mininum to get nginx going with
  # Unicorn or Rainbows! servers.  Generally these configuration settings
  # are applicable to other HTTP application servers (and not just Ruby
  # ones), so if you have one working well for proxying another app
  # server, feel free to continue using it.
  #
  # The only setting we feel strongly about is the fail_timeout=0
  # directive in the "upstream" block.  max_fails=0 also has the same
  # effect as fail_timeout=0 for current versions of nginx and may be
  # used in its place.
  #
  # Users are strongly encouraged to refer to nginx documentation for more
  # details and search for other example configs.
  
  # you generally only need one nginx worker unless you're serving
  # large amounts of static files which require blocking disk reads
  worker_processes 1;
  
  # # drop privileges, root is needed on most systems for binding to port 80
  # # (or anything &lt; 1024).  Capability-based security may be available for
  # # your system and worth checking out so you won't need to be root to
  # # start nginx to bind on 80
  user nobody nogroup; # for systems with a "nogroup"
  # user nobody nobody; # for systems with "nobody" as a group instead
  
  # Feel free to change all paths to suite your needs here, of course
  pid /path/to/nginx.pid;
  error_log /path/to/nginx.error.log;
  
  
  events {
    worker_connections 1024; # increase if you have lots of clients
    accept_mutex off; # "on" if nginx worker_processes &gt; 1
    # use epoll; # enable for Linux 2.6+
    # use kqueue; # enable for FreeBSD, OSX
  }
  
  http {
    # nginx will find this file in the config directory set at nginx build time
    include mime.types;
  
    # fallback in case we can't determine a type
    default_type application/octet-stream;
  
    # click tracking!
    access_log /path/to/nginx.access.log combined;
  
    # you generally want to serve static files with nginx since neither
    # Unicorn nor Rainbows! is optimized for it at the moment
    sendfile on;
  
    tcp_nopush on; # off may be better for *some* Comet/long-poll stuff
    tcp_nodelay off; # on may be better for some Comet/long-poll stuff
  
    # we haven't checked to see if Rack::Deflate on the app server is
    # faster or not than doing compression via nginx.  It's easier
    # to configure it all in one place here for static files and also
    # to disable gzip for clients who don't get gzip/deflate right.
    # There are other gzip settings that may be needed used to deal with
    # bad clients out there, see http://wiki.nginx.org/NginxHttpGzipModule
    gzip on;
    gzip_http_version 1.0;
    gzip_proxied any;
    gzip_min_length 500;
    gzip_disable "MSIE [1-6]\.";
    gzip_types text/plain text/xml text/css
               text/comma-separated-values
               text/javascript application/x-javascript
               application/atom+xml;
  
    # this can be any application server, not just Unicorn/Rainbows!
    upstream app_server {
      # fail_timeout=0 means we always retry an upstream even if it failed
      # to return a good HTTP response (in case the Unicorn master nukes a
      # single worker for timing out).
  
      # for UNIX domain socket setups:
      server unix:/home/portfolio/tmp/.unicorn.sock fail_timeout=0;
  
      # for TCP setups, point these to your backend servers
      # server 192.168.0.7:8080 fail_timeout=0;
      # server 192.168.0.8:8080 fail_timeout=0;
      # server 192.168.0.9:8080 fail_timeout=0;
    }
  
    server {
      # enable one of the following if you're on Linux or FreeBSD
       listen 80 default deferred; # for Linux
      # listen 80 default accept_filter=httpready; # for FreeBSD
  
      # If you have IPv6, you'll likely want to have two separate listeners.
      # One on IPv4 only (the default), and another on IPv6 only instead
      # of a single dual-stack listener.  A dual-stack listener will make
      # for ugly IPv4 addresses in $remote_addr (e.g ":ffff:10.0.0.1"
      # instead of just "10.0.0.1") and potentially trigger bugs in
      # some software.
      # listen [::]:80 ipv6only=on; # deferred or accept_filter recommended
  
      client_max_body_size 4G;
      server_name _;
  
      # ~2 seconds is often enough for most folks to parse HTML/CSS and
      # retrieve needed images/icons/frames, connections are cheap in
      # nginx so increasing this is generally safe...
      keepalive_timeout 5;
  
      # path for static files
      root /var/www/portfolio/public;
  
      # Prefer to serve static files directly from nginx to avoid unnecessary
      # data copies from the application server.
      #
      # try_files directive appeared in in nginx 0.7.27 and has stabilized
      # over time.  Older versions of nginx (e.g. 0.6.x) requires
      # "if (!-f $request_filename)" which was less efficient:
      # http://bogomips.org/unicorn.git/tree/examples/nginx.conf?id=v3.3.1#n127
      try_files $uri/index.html $uri.html $uri @app;
  
      location @app {
        # an HTTP header important enough to have its own Wikipedia entry:
        #   http://en.wikipedia.org/wiki/X-Forwarded-For
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  
        # enable this if you forward HTTPS traffic to unicorn,
        # this helps Rack set the proper URL scheme for doing redirects:
        # proxy_set_header X-Forwarded-Proto $scheme;
  
        # pass the Host: header from the client right along so redirects
        # can be set properly within the Rack application
        proxy_set_header Host $http_host;
  
        # we don't want nginx trying to do something clever with
        # redirects, we set the Host: header above already.
        proxy_redirect off;
  
        # set "proxy_buffering off" *only* for Rainbows! when doing
        # Comet/long-poll/streaming.  It's also safe to set if you're using
        # only serving fast clients with Unicorn + nginx, but not slow
        # clients.  You normally want nginx to buffer responses to slow
        # clients, even with Rails 3.1 streaming because otherwise a slow
        # client can become a bottleneck of Unicorn.
        #
        # The Rack application may also set "X-Accel-Buffering (yes|no)"
        # in the response headers do disable/enable buffering on a
        # per-response basis.
        # proxy_buffering off;
  
        proxy_pass http://app_server;
      }
  
      # Rails error pages
      error_page 500 502 503 504 /500.html;
      location = /500.html {
        root /var/www/portfolio/public;
      }
    }
  }
  
  types_hash_max_size: 2048;
  types_hash_bucket_size: 64;
  </code></pre>