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raspberry:read_only [2021/05/27 14:04]
admin [Fstab] 		raspberry:read_only [2021/05/27 14:23] (current)
admin [Remount]
Line 7: Line 7:
 In the fstab: In the fstab:
   $ sudo nano /etc/fstab   $ sudo nano /etc/fstab
-one has to change the SD card to read only (ro) and also make a temporary virtual drive:+one has to change the SD card to read only (ro) and one has to make a temporary virtual drive (30MB), too:
   /dev/mmcblk0p2  /               ext4    defaults,noatime,ro  0       1   /dev/mmcblk0p2  /               ext4    defaults,noatime,ro  0       1
   tmpfs           /tmp            tmpfs   defaults,size=30M    0       0   tmpfs           /tmp            tmpfs   defaults,size=30M    0       0
  
 +----
 ==== Disable some Programs ==== ==== Disable some Programs ====
 One has to disable some programs,  rsyslog and dphys-swapfile:\\ One has to disable some programs,  rsyslog and dphys-swapfile:\\
Line 16: Line 17:
   $ sudo systemctl disable rsyslog   $ sudo systemctl disable rsyslog
   $ sudo systemctl disable dphys-swapfile   $ sudo systemctl disable dphys-swapfile
 +
 +If one needs a programs that requires writing one has to make sure that will be in the temporary drive. That could be done for example with a symbolic link:
 +  $ ln -s /home/pi/tmp /tmp
  
 ---- ----
 ==== Remount ==== ==== Remount ====
-To remount the partition writable:\\+ 
 +For changes in the system one has to remount the partition writable:\\
   $ sudo mount / -o remount,rw   $ sudo mount / -o remount,rw