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1. Log in as root.
2. You can inspect the file system structure in /, but the actual changes reside in /rw/overlay-rw/
3. Run the following command to find all changed files (you can pipe it to a file as well for easier inspection): find /rw/ 
4. Now let's run a more narrow search to only find the changed files in /etc/ : find /rw/ | grep "/rw/overlay-rw/etc/" 
5. Let's say, you found this file, and you know you modified it: /rw/overlay-rw/etc/check_mk/logwatch.cfg
   1. You can remove the changes by running rm /rw/overlay-rw/etc/check_mk/logwatch.cfg
   2. Do NOT remove the file at /etc/check_mk/logwatch.cfg! This would remove the whole file and not only custom changes!
6. Reboot the appliance. This is necessary due to the way the overlay filesystem works.
   1. Remounting the root file system works as well and is less disruptive: mount -o remount /, but if you are in doubt, reboot.
7. Congratulations, you have reverted the file to its factory default.
   
   

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