does not actually mount the root fs readonly

[fokkedj]

after running the script, some tmps's are created, but the root is still mounted as rw.
The output of df looks like this:

Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root       15011056 1251204  13117476   9% /
devtmpfs          470180       0    470180   0% /dev
tmpfs             474788       0    474788   0% /dev/shm
tmpfs             474788   12224    462564   3% /run
tmpfs               5120       4      5116   1% /run/lock
tmpfs             474788       0    474788   0% /sys/fs/cgroup
/dev/mmcblk0p1     41853   21328     20525  51% /boot
tmpfs              94956       0     94956   0% /run/user/1000

any idea?

raspberry Pi 3B, raspbarian stretch

[Rolf-M]

Hello fokkedj,
your output shows that there is no overlay active. So check if you had correctly run the script.

About your question: I would say the intension of the script is not changing the /boot mountpoint. If you like to have this, you will need to change /etc/fstab. change "defaults" to "defaults,ro" in the line of the /boot mount

The next boot will be with readonly /boot tree.

Be aware that you will need to remout in rw mode to make changes to the cmdline.txt afterwards!

Regards, Rolf