Laney's blog

. o O (WordPress 2.7.1 is pretty sexy)

Congratulations on mankind for reaching the splendid milestone that is 1234567890 seconds since 1970 began. Who'd have thought we'd make it this far?

But really, congratulations on the Debian team for releasing Lenny (I even have one package uploaded there)! The point of this post is mainly to point people upgrading their Xen DomUs of a bug that I encountered and how to fix it (thanks to Andy Smith).

When doing the upgrade I got this message:

laney@cripps:~$ sudo dpkg --configure -a
Setting up linux-image-2.6.26-1-xen-686 (2.6.26-13) ...
update-initramfs: Generating /boot/initrd.img-2.6.26-1-xen-686
Searching for GRUB installation directory ... found: /boot/grub
warning: grub-probe can't find drive for /dev/sda1.
grub-probe: error: Cannot find a GRUB drive for /dev/sda1. Check your
device.map.

dpkg: error processing linux-image-2.6.26-1-xen-686 (--configure):
subprocess post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of linux-image-2.6-xen-686:
linux-image-2.6-xen-686 depends on linux-image-2.6.26-1-xen-686; however:
Package linux-image-2.6.26-1-xen-686 is not configured yet.
dpkg: error processing linux-image-2.6-xen-686 (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of linux-image-xen-686:
linux-image-xen-686 depends on linux-image-2.6.26-1-xen-686; however:
Package linux-image-2.6.26-1-xen-686 is not configured yet.
dpkg: error processing linux-image-xen-686 (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
linux-image-2.6.26-1-xen-686
linux-image-2.6-xen-686
linux-image-xen-686

This is apparently a bug in grub-probe when dealing with Xen virtual machines. A post by Andy here gives the magic incantation to fix it:

sudo sh -c "echo '(hd0) /dev/sda' > /boot/grub/device.map && cd /dev && mknod sda b 202 0"

(you might need to change sda to xvda depending on what your error says).

A quick dpkg --configure -a later and everything is hunky-dory. Now in a sexy Lenny system in which everything seems to just work, just like the marketing says. Some Apache and MySQL warnings to fix up, but nothing too major. Yet.

(on a side-note – I got MOTU recently. Breakage coming to an Ubuntu near you. Yay!)