Some intro about fsprotect:
set of scripts to transparently mount a RAM fs over the readonly root file system to protect the flash storage or to protect from unwanted changes. (the idea is not to write anything to the flash disk while system is running, this utility protects your system from fs corruption after unexpected power downs.)
Fsprotect homepage has version 1.0.5 available for download in debian package source format.
# apt-get update # apt-get install fsprotect # apt-get install aufs-tools
Then change /etc/default/fsprotect if you want to protect more then one filesystem.
To get it working with grub/grub2 -> edit /etc/default/grub and add fsprotect=1G to the kernel options.
Remember to do a update-grub afterwards.
After rebooting you can change everything you want; after the next reboot you’ll have a fresh system again. Because everything is mounted RO its extremly power failure proof.