Protect your Raspberry PI SD card, use Read-Only filesystem

  • need to change UPEX4C_autoconfigfil in /usr/sbin/update-exim4.conf

  • Will brick your Pi if you're running the new PIXEL distro. Any idea what's causing this?

  • You should really add some commentary about the tmpfs lines in /etc/fstab before the code listing. When I got to that step, I read that we were ready to set the volume to read-only, and thought, "I know how to do that," and stopped reading at that point, resulting in an unbootable system. I'd imagine many other folks with sysadmin experience will do the same. Actually, you should probably add the tmpfs lines first before you start making changes that depend on them, then make the changes, then change fstab a second time to make it read-only. Also, for Jessie, the systemd changes are unnecessary, because /run is already a tmpfs volume. And it might be worth redirecting things from /var/run to /run just for simplicity (on Jessie).

  • How to fix this ?

    pi@raspberrypi(ro):~$ reboot
    Failed to execute operation: The name org.freedesktop.PolicyKit1 was not provided by any .service files
    Must be root.

  • you need to be root..
    use 'sudo'

  • Hello! Can anybody help me with user crontab file? I have problem: i installed raspbian in Read-only mode, i have some scripts, (cron jobs) that works every 5 minutes, 10 etc. I set it by crontab -e command, but after reboot, system is clean it, i think, because i moved /var/spool dir to tmpfs (like howto), and user cronjob file stored at /var/spool/cron/crontabs dir. How i can fix it for not clearing after system reboot? Thanks!

  • Did anyone figured out how to use crontab? it is wiped after reboot and i really need it :(

  • Staff

    We need to put the system into Read Write Mode before changing the crontab
    If you followed this tuto should be something like that

    sudo mount -o remount,rw /

    Then edit your crontab

    sudo crontab -e

    put pack in Read Only or reboot

    sudo mount -o remount,ro /

  • Charles you are going wrong. crontab -e give us file on /tmp which has been deleted on boot. We need to go this way:
    sudo su
    nano /etc/crontab (dont forget to add user) example below:

            • root /usr/bin/ > /dev/null 2>&1

  • Hello Charles,
    I was wondering if I don't have entry about /tmp being a mount entry point for tmpfs neither in fstab nor mtab, what would be the point in moving things there? Am I missing something or?
    I am playing with Raspberry PI-2 and Raspbian Jessie.

  • This post is deleted!

  • Great article, thanx! To be able to use sudo i did have to add this line to /etc/fstab as well:

    tmpfs /var/lib/sudo/ts tmpfs nosuid,nodev 0 0

  • Has this tutorial worked for anyone? The 1st error is saw was under Move files to temp filesystem after running:

    touch /tmp/dhcpcd.resolv.conf; ln -s /tmp/dhcpcd.resolv.conf /etc/resolv.conf

    Failed to create symbolic link ‘etc/resolv.conf’ file exists. Next after reboot see errors regarding “a start job is running for dhcpd on all interfaces..." The raspi fails to boot and see pi@raspberrypi: prompt. Thanks in advance for any insights!

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