NGINX configuration

NGINX Configuration for maintenance page

# i am in /etc/nginx/sites-available/

if (-f $document_root/system/maintenance.html) {
    return 503;
}

error_page 503 @maintenance;
location @maintenance {
    rewrite  ^(.*)$  /system/maintenance.html last;
    break;
}

deploy.rb

namespace :deploy do
  namespace :web do
    task :disable, :roles => :web, :except => { :no_release => true } do
      require 'haml'
      on_rollback { run "rm #{shared_path}/public/maintenance.html" }

      reason = ENV['REASON']
      deadline = ENV['UNTIL']

      template = File.read("./app/views/layouts/maintenance.html.haml")
      result = Haml::Engine.new(template).render

      put result, "#{shared_path}/system/maintenance.html", :mode => 0644
    end
  end
end

maintenance.html.haml

!!!
%html
  %head
    %title Blog
    :css
      html, body {
        background-color: #4B7399;
        font-family: Verdana, Helvetica, Arial;
        font-size: 14px;
      }

      a {
        color: #0000FF;
        img { border: none; }
      }

      #container {
        width: 80%;
        margin: 0 auto;
        background-color: #FFF;
        padding: 20px 40px;
        border: solid 1px black;
        margin-top: 20px;
      }
  %body
    #container
      %h1
        The system is down for #{reason ? reason : "maintenance"}
      %p
        It will be back #{deadline ? deadline : "soon"}

nginx.conf

upstream unicorn {
  server unix:/opt/apps/maps/current/tmp/sockets/unicorn.sock fail_timeout=0;
}

server {
  listen 80 default_server deferred;
  # server_name example.com;
  root /opt/apps/maps/current/public;
  
  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
    }
    
    try_files $uri/index.html $uri @unicorn;
    location @unicorn {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://unicorn;
    }
    
    error_page 500 502 503 504 /500.html;
    client_max_body_size 20M;
    keepalive_timeout 10;
  }