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I symlinked /tmp to a second hard drive (the root partition is on an SSD and I want to avoid wear).

Ever since then, it doesn't get emptied on a reboot. Any idea why? I use Ubuntu 14.10.

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/tmp is typically mounted as a RAM-disk, so it resets whenever you reboot the machine. When you symlinked it to a location on a harddrive, the RAM-disk can no longer be mounted at /tmp (because the symlink already exists at that path), so everything written to /tmp is stored on your hard drive. You really should just remove the symlink and let the RAM-disk mount.

  • /tmp is not mentioned in fstab, doesn't that mean it's part of the normal filesystem? – spraff Jan 22 '15 at 7:29
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Using a bind mount works.

/etc/fstab contains

/path/to/tmp /tmp none bind 0 0

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