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I have a small embedded board PC which uses flash card to boot and I'm running Ubuntu server 12.04. But since flash cards have limited lifetime I would like to mount it as read only and have only some folders in tmpfs for file operations.

I edited my fstab as follows:

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc /proc proc nodev,noexec,nosuid 0 0
UUID=0b2dc455-4dd0-4a4f-934c-587962b006c8 / ext4 ro,discard,noatime,nodiratime,errors=remount-ro 0 1
tmpfs /tmp      tmpfs nodev,nosuid      0       0
tmpfs /var/log  tmpfs nodev,nosuid      0       0

But since the system is read-only it doesn't mount tmpfs folders. Is there any way I can mount tmpfs on read-only filesystem?

EDIT

df -h looks like this after startup:

Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2  7.4G  2.0G  5.5G  27% /
udev            450M  4.0K  450M   1% /dev
none            453M     0  453M   0% /run/shm
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  • sudo mount -o remount,rw /tmp should work
    – Drt
    Apr 5, 2013 at 13:47
  • Nope, no error is printed, but it doesn't appear in df -h
    – rock-ass
    Apr 5, 2013 at 13:54
  • run mount to verify
    – Drt
    Apr 5, 2013 at 14:04
  • run as sudo mount -t tmpfs -o remount,rw /tmp and check using mount
    – Drt
    Apr 5, 2013 at 14:16

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