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LTSP chroot is not compressed since Ubuntu Lucid

2011, February 7 - 18:24 — müzso
After upgrading to Maverick (from Karmic) and re-creating the LTSP chroot from the Maverick repositories, I was surprised to see that the image file was almost the same size as the chroot directory (/opt/ltsp/i386) itself. Shocked As it turns out (from the changelog of the ltsp source package), some people experienced problems with compressed chroot images and the decision was made to disable image compression by default.
From the changelog:
ltsp (5.2.1-0ubuntu3) lucid; urgency=low
* Turn off chroot compression by default. As it makes NBD unstable.
-- Stéphane Graber <stgraber@ubuntu.com> Wed, 24 Mar 2010 08:21:55 -0400

However you can still enable image compression on your LTSP server in /etc/ltsp/ltsp-update-image.conf. Simply remove the -noF -noD -noI options from the NO_COMP variable.

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2011, October 8 - 20:33 — müzso

LTSP chroot compression can be re-enabled

As it turned out, the problem was in nbd-proxy. Thus the solution is not to disable NBD compression, but to disable the proxy. Just edit the BOOTPROMPT_OPTS line in the /etc/ltsp/update-kernels.conf file of your LTSP chroot, rebuild the chroot initramfs (update-initramfs -u) and update the kernels used by PXE (ltsp-update-kernels).

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