Skip to content

Instantly share code, notes, and snippets.

@jp80
jp80 / OVERLAYFS
Created January 13, 2021 15:44 — forked from mutability/OVERLAYFS
readonly root via overlayfs
- install the two shellscripts into the appropriate places under /etc/initramfs-tools
- run update-initramfs
- put "overlay=yes" on the kernel command line
- reboot
With the overlay in place, the real root is mounted readonly on /ro.
Only the root fs is changed, other filesystems are mounted normally.
Remove "overlay=yes" (or change it to something other than yes) and reboot to go back to readwrite.
(This probably means that you want the commandline config to live somewhere other than on the root fs, e.g. under /boot)