Rack_Maintenance is a rack middleware to show maintenance page while you maintenance application.
gem install rack_maintenance
####basic usage
#config.ru
require 'rack/maintenance'
use Rack::Maintenance
####set template page to show
#config.ru
require 'rack/maintenance'
use Rack::Maintenance,
template: File.read('path/to/maintenance.html')
####set inactivate
#config.ru
require 'rack/maintenance'
use Rack::Maintenance,
template: File.read('path/to/maintenance.html'),
activate: false
An 'activate' option is default to true and maintenance page will be displayed. When it set to false,Rack::Maintenance is not work.
####set status code if you wish to. (default to 503)
#config.ru
require 'rack/maintenance'
use Rack::Maintenance,
status: 200,
template: File.read('path/to/maintenance.html'),
Although status code can be changed, there are almost no need to do so.