Nginx Maintenance Page

capistrano task

cp #{latest_release}/system/maintenance.html #{shared_path}/system/maintenance.html.not_active

# Swap in the maintenance page
namespace :web do
    task :disable, roles: :web do
        on_rollback {run "rm #{shared_path}/system/maintenance.html"}

        run "if [[ !(-f #{shared_path}/system/maintenance.html) ]] ; then ln -s #{shared_path}/system/maintenance.html.not_active #{shared_path}/system/maintenance.html ; else echo 'maintenance page already up'; fi"
    end

    task :enable, roles: :web do
        run "rm #{shared_path}/system/maintenance.html"
    end
end

nginx.config

recursive_error_pages on;
 
if (-f $document_root/system/maintenance.html) {
  return 503;
}
 
error_page 404 /404.html;
error_page 500 502 504 /500.html;
error_page 503 @503;
location @503 {
 
  error_page 405 = /system/maintenance.html;
 
  # Serve static assets if found.
  if (-f $request_filename) {
    break;
  }
 
  rewrite ^(.*)$ /system/maintenance.html break;
}