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Monday·21·April·2014

Xen: Running a Sid DomU with PyGrub on a Squeeze Dom0 //at 03:07 //by abe

from the one-and-a-half-generation-away dept.

I’m running one Debian Sid and one Jessie (Testing) Xen guest domain on a Debian Squeeze (Oldstable) Xen 4.0 running host server.

Recently I had to reboot one these virtual machines after more than a year of uptime. But the new 3.14 kernel from Debian Experimental didn’t boot. Neither did 3.13 from Debian Unstable. Nor did any other kernel image newer then the 3.5-trunk (from Debian Experimental back than) work.

Everytime pygrub bailed out with this error message:

Error: (2, 'Invalid kernel', 'xc_dom_find_loader: no loader found\n')

(Yes, the parentheses and the “\n” were part of the error message.)

After some searching on the web I found hints that this message may be caused by an unsupported compression type in the kernel image.

And indeed, if I unpack the “vmlinuz” with the extract-vmlinux tool which is part of Linux’ source code (but not yet part of any binary package in Debian), and use the extract file in grub’s menu.lst (which is then read by pygrub) instead, the DomU boots Linux kernel 3.14 again, even on a Squeeze-running Dom0.

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This is the blog or weblog of Axel Stefan Beckert (aka abe or XTaran) who thought, he would never start blogging... (He also once thought, that there is no reason to switch to this new ugly Netscape thing because Mosaïc works fine. That was about 1996.) Well, times change...

He was born 1975 at Villingen-Schwenningen, made his Abitur at Schwäbisch Hall, studied Computer Science with minor Biology at University of Saarland at Saarbrücken (Germany) and now lives in Zürich (Switzerland), working at the Network Security Group (NSG) of the Central IT Services (Informatikdienste) at ETH Zurich.

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