First aids restoring a Rails app after a crash

The very first steps to restore a Rails application after a crash:

1. Check the logs:
   tail -f myapp/log/production.log

   Hopefully here will appear the error that generates the crash.

   If nothing appear, even after refreshing, is because the application is not running, so usually is a fail on the mongrels. If in doubt is not a bad idea restart them anyway.

2. Check for the mongrels for our app and kill/restart them.
   ps aux | grep mongrel
   rm log/mongrel.88*.pid
   mongrel_rails cluster::start
3. If is not the mongrels, probably something related to the web server. Restart it.
   nginx -t -c /etc/nginx/nginx.conf
   sudo /etc/init.d/nginx restart