Re: [Xen-users] Convert Debian 6 from HVM to PV

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-02-25 at 15:24 +0000, James Pifer wrote:

> I'm having trouble converting them. I believe need to convert the menu 
> from something like this:
>          root (hd0,0)
>          kernel /xen.gz-2.6.18-53.1.14.el5
>          module /vmlinuz-2.6.18-53.1.14.el5xen ro root=LABEL=/
>          module /myinitrd.img
> 
> to something like this:
>          root (hd0,0)
>          kernel /vmlinuz-2.6.18-53.1.14.el5xen ro root=LABEL=/
>          initrd /myinitrd.img

This isn't strictly necessary since pygrub will happily ignore the first
xen.gz line and in any case this syntax is specific to RH, under Debian
in a guest with grub the entries will be similar to the second form
anyway.

> The Debian 6 VMs I have appear to use grub2, which is a pain in the rear 
> as far as I can tell. I expect there are good reasons for it, but being 
> able to modify a menu.lst makes this transition much easier. The top of 
> the file says to use /etc/grub.d and settings from /etc/default/grub to 
> update grub.cfg, but I can't figure out how they build the menu section.

update-grub runs the scripts under /etc/grub.d.

> Here's the menu section of grub.cfg. Can anyone give me some help on 
> changing this to the proper form for booting pv?
> 
> ### BEGIN /etc/grub.d/10_linux ###
> menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-686' --class debian 
> --class gnu-linux --class gnu --class os {
>          insmod part_msdos
>          insmod ext2
>          set root='(hd0,msdos1)'
>          search --no-floppy --fs-uuid --set 
> 8d0d1b45-e312-49ee-9213-50651e18f259
>          echo    'Loading Linux 2.6.32-5-686 ...'
>          linux   /boot/vmlinuz-2.6.32-5-686 
> root=UUID=8d0d1b45-e312-49ee-9213-50651e18f259 ro  quiet
>          echo    'Loading initial ramdisk ...'
>          initrd  /boot/initrd.img-2.6.32-5-686
> }

This already looks correct, except you need to install the 686-bigmem
kernel flavour and not the -686 flavour to get Xen support.

Ian.


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