After reading this question about how often tmp is cleared, it would be best for our setup if tmp is encrypted. How do I encrypt it?
My fstab looks like this:
proc /proc proc nodev,noexec,nosuid 0 0
/dev/mapper/vg_doulos-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sda1 during installation
UUID=205a1a54-7dfa-45a6-a7e3-4a7234b3a473 /boot ext4 defaults 0 2
/dev/mapper/vg_doulos-home /home ext4 defaults 0 2
/dev/mapper/vg_doulos-tmp /tmp ext4 defaults 0 2
# swap was on /dev/sda2 during installation
#UUID=705e9f69-bf95-4d44-9119-c40076d10333 none swap sw 0 0
/dev/mapper/cryptswap1 none swap sw 0 0
crypttab:
# <target name> <source device> <key file> <options>
cryptswap1 /dev/sda2 /dev/urandom swap,cipher=aes-cbc-essiv:sha256
Is it sufficient to put something like this in crypttab?
crypttmp /dev/mapper/vg_doulos-tmp /dev/urandom
and then this to replace the tmp file entry in fstab?
/dev/mapper/crypttmp /tmp ext4 defaults 0 2
/tmp
beats most alternatives, when it comes to privacy of the files it contains.)/tmp
stays there and can be recovered quickly and trivially.