In case of emergencies...
Should the system reboot and nginx not
There have been problems with rebooting gtlab. If you after (re)starting nginx do not see the nginx test page when opening testing.oahpa.no then try restarting iptables as well:
sudo service iptables restart
If for some reason the system is running slowly, inspect processes running,
, the latter of which is a more updated and easier to interpret tool.