debian@beaglebone:~$ *sudo nano /etc/fstab* Add:* ,ro *after noatime
# /etc/fstab: static file system information. # # Auto generated by RootStock-NG: setup_sdcard.sh # /dev/mmcblk0p1 / ext4 noatime*,ro*,errors=remount-ro 0 1 debugfs /sys/kernel/debug debugfs defaults 0 0 Save and exit nano. restart board: debian@beaglebone:~$ *sudo shutdown now -r* After board comes back up: debian@beaglebone:~$ * mount | grep /dev/mmcblk0p1*/dev/mmcblk0p1 on / type ext4 (*ro* ,noatime,errors=remount-ro,data=ordered) Attempt to make a zero byte file: debian@beaglebone:~$ * touch ~/test*touch: cannot touch `/home/debian/test': Read-only file system remount read / write: debian@beaglebone:~$ *sudo mount -o remount,rw /dev/mmcblk0p1 /* retest: debian@beaglebone:~$ * touch ~/test*debian@beaglebone:~$ * ls .*bin test *After* a reboot the file system should then be read only again. Do note: That if you attempt to remount ro on a rw file system. You will most probably get a "dev busy" message. Using umount on / would be very unwise . . . Marking a rootfs as read only has to be done via /etc/fstab + a reboot. On Sun, Aug 2, 2015 at 10:37 AM, William Hermans <[email protected]> wrote: > google "linux how to remount read / write" . . . such as: > > > http://askubuntu.com/questions/175739/how-do-i-remount-a-filesystem-as-read-write > > > > On Sun, Aug 2, 2015 at 1:18 AM, Christian Gurk < > [email protected]> wrote: > >> Thank you Robert for the fast response. >> I assume,I should use your instructions on a Linux-PC and not on the BBB? >> Normally I only work with Windows, but I think I will find a virtual >> machine to perform your suggested steps. >> And after I switched to RO how do I temporarily switch back to rw to >> update/change the system? Or will I find instructions in the fstab file? >> Will try it later! >> Thanks again >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
