SafeMode can be enabled from the management console.
To enable SafeMode
Access the On-Premises Analytics Management Console. Refer to Connecting to the Console.
In the console, select the Reboot | Shutdown option and then press Enter.
Navigate down to the Boot Analytics into safemode option to highlight Enable, and then press Enter.
Select Yes in the confirmation dialog.
Press Enter.
The On-Premises Analytics instance immediately reboots and comes back up in SafeMode.
In SafeMode, the web interface is served from an HTTP server. The HTTPS server is not started in SafeMode.