I had an interesting problem – we try to build our VMs as lean as possible so occasionally we will have machines that dont have that much disk or RAM. When RAM is minimal, our /tmp partition, which is a RAMFS device, gets small.
Why does this matter, well lots of the processes that run like to use tmp space for, well, tmp space. If this tmp space fills, then the processes that was running, usually fails.
Have you ever seen an error like this? This was after doing an apt-get dist-upgrade on one of smaller VMs.
tar: ./lib/foo/bar/file.bin: Cannot write: No space left on device
tar: Skipping to next header
tar: Error exit delayed from previous errors
dpkg-deb: subprocess tar returned error exit status 2
debsums: can't unpack /var/cache/apt/archives/foo_i386.deb
E: Problem executing scripts DPkg::Post-Invoke 'if [ -x /usr/bin/debsums ]; then /usr/bin/debsums --generate=nocheck -sp /var/cache/apt/archives; fi'
E: Sub-process returned an error code
apt-get does not like to run out of space, and the /tmp partition is pretty small on this machine. Smaller than the amount of space this package was taking to compile. This is an easy fix however. First you have to completely remove this package. More than likely its got something missing or corrupted. You can do this easily by entering in the following on a console (substituting “foo” for whatever package gave you the error):
# dpkg --purge foo
Once you have the package removed, just run apt-get with “env TMPDIR=/var/tmp” prepended to it. The tmp dir does not have to be /var/tmp, it can be any directory that the user you are running as has write access to.
# env TMPDIR=/var/tmp apt-get install foo
On a slight aside, we sometimes also get stuck with these errors.
dpkg: error processing linux-image-1.2.3-4-server (--purge):
cannot remove `/boot/System.map-1.2.3-4-server': Read-only file system
This one is easy to fix and we've been doing this one for a while. On a console, before you run the command that gave you this error, you need to remount the partition (in this case /boot) in RW.
# mount -oremount,rw /boot