We recommend you stop the OnApp service on your Control Panel server before gracefully rebooting it.

To stop it, send the following command via SSH, logged in as root: 

service onapp stop
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For OnApp 3.4 and later:

Starting from OnApp 3.4, we implemented a daemon monitoring service called monit. To stop OnApp and make it remain offline, the monit service must be stopped first: 

service monit stop 
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After the monit service is stopped, the OnApp service can be stopped.