nginx and passenger configuration for multiple apps on the same vhost

application.rb

config.action_controller.page_cache_directory = "#{Rails.root}/public/cache"

deploy.rb

namespace :deploy do
  # for passenger
  task :start, :roles => :app do
    run "touch #{current_release}/tmp/restart.txt"
  end

  task :stop, :roles => :app do
    # Do nothing.
  end

  desc "Restart Application"
  task :restart, :roles => :app do
    run "touch #{current_release}/tmp/restart.txt"
  end
end

nginx.conf

server {
  listen 80;
  server_name app.com;
  root /var/www;

  access_log /var/log/nginx/app.com_access.log;
  error_log /var/log/nginx/app.com_error.log error;

  if ($request_method !~ ^(GET|HEAD|PUT|POST|DELETE|OPTIONS)$ ){
    return 405;
  }

  location ~ "^/.*/assets/(.*/)*.*-[0-9a-f]{32}.*" {
    gzip_static on; # to serve pre-gzipped version
    expires     max;
    add_header  Cache-Control public;
  }
  location = /favicon.ico {
    expires    1w;
    add_header Cache-Control public;
  }

  location ~ "^/app1(.*)" {
    # you should symlinc /var/www/app1 to your rails public folder
    root /var/www/app1;
    gzip_static on; # to serve pre-gzipped version
    # cached pages are under the public/cached directory
    try_files /system/maintenance.html /cache/$1/index.html /cache/$1.html $1 @app1;
  }

  location @app1 {
    passenger_enabled on;
    passenger_base_uri /app1;
  }
}