Wildcard .dev dns settings on osx

dev.zone

# create a new file at /var/named/dev.zone

$TTL  60
$ORIGIN dev.
@     1D IN SOA  localhost. root.dev. (46 3H 15M 1W 1D)
      1D IN NS   localhost.
      1D IN A    127.0.0.1
*.dev. 60 IN A 127.0.0.1

named.conf

# Add this to /etc/named.conf

zone "dev" IN {
  type master;
  file "dev.zone";
  allow-update { none; };
};

nginx-site.conf

upstream yoursite_dev {
  server unix://Users/you/Sites/yoursite/tmp/sockets/unicorn.sock;
}
server {
  client_max_body_size 100M;
  listen       80;
  server_name  www.yoursite.dev;
  root  /Users/you/Sites/yoursite/public;
  access_log /dev/null ;
  error_log /dev/null ;
  #  access_log /Users/you/Sites/yoursite/log/nginx_access.log;
  #  error_log /Users/you/Sites/yoursite/log/nginx_error.log;
  location /{
    try_files /system/maintenance.html $uri $uri/index.html $uri.html @app;
    if ( -f $document_root/system/maintenance.html) {
      return 503;
    }
  }
  location @app{
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://yoursite_dev;
  }
  recursive_error_pages on;
  error_page 500 502 504  /500.html;
  error_page 503 @maintenance;
  location @maintenance {
    error_page 405 = /system/maintenance.html;
    if (-f $request_filename) {
      break;
    }
    rewrite ^ /system/maintenance.html break;
  }
  location = /500.html {
    root  /Users/you/Sites/yoursite/public;
  }
  location = /502.html {
    root  /Users/you/Sites/yoursite/public;
  }
 # location = ^/(assets)/  {
    #root /Users/you/Sites/yoursite/public;
    #expires max;
    #gzip_static on;
    #add_header  Cache-Control public;
    ##add_header Last-Modified "";
    ##add_header ETag "";
 # }
}

unicorn.rb

APP_ROOT = File.expand_path(File.dirname(File.dirname(__FILE__)))

if ENV['MY_RUBY_HOME'] && ENV['MY_RUBY_HOME'].include?('rvm')
  begin
    rvm_path = File.dirname(File.dirname(ENV['MY_RUBY_HOME']))
    rvm_lib_path = File.join(rvm_path, 'lib')
    $LOAD_PATH.unshift rvm_lib_path
    require 'rvm'
    RVM.use_from_path! APP_ROOT
  rescue LoadError
    raise "RVM ruby lib is currently unavailable."
  end
end

ENV['BUNDLE_GEMFILE'] = File.expand_path('../Gemfile', File.dirname(__FILE__))
require 'bundler/setup'

worker_processes 2
working_directory APP_ROOT

preload_app true

timeout 30

listen      APP_ROOT + "/tmp/sockets/unicorn.sock", :backlog => 64
pid         APP_ROOT + "/tmp/pids/unicorn.pid"
stderr_path APP_ROOT + "/log/unicorn.stderr.log"
stdout_path APP_ROOT + "/log/unicorn.stdout.log"

before_fork do |server, worker|
  defined?(ActiveRecord::Base) && ActiveRecord::Base.connection.disconnect!

  old_pid = Rails.root + '/tmp/pids/unicorn.pid.oldbin'
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      puts "Old master alerady dead"
    end
  end
end

after_fork do |server, worker|
  defined?(ActiveRecord::Base) && ActiveRecord::Base.establish_connection
  child_pid = server.config[:pid].sub('.pid', ".#{worker.nr}.pid")
  system("echo #{Process.pid} > #{child_pid}")
end

Read this: http://clintberry.com/2011/wildcard-sub-domains-on-osx-web-development-on-localhost/