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Re: [Xen-users] Transitioning from multi-boot to Xen

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Transitioning from multi-boot to Xen
From: Chris Jones <cjns1989@xxxxxxxxx>
Date: Sun, 06 Feb 2011 18:51:30 -0500
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On Thu, Jan 27, 2011 at 10:31:45PM EST, Chris Jones wrote:
> I am looking into setting up Xen 4.0 on a simple dual-boot
> Windows/ubuntu laptop with the following partitions:
> 
> |  Device      Boot    Start         End      Blocks   Id  System
> |  /dev/sda1   *           1         223     1782784    7  HPFS/NTFS
> |  /dev/sda2             223       21713   172624888    7  HPFS/NTFS
> |  /dev/sda3           35854       38914    24576344    7  HPFS/NTFS
> |  /dev/sda4           21713       28522    54686721    5  Extended
> |  /dev/sda5           21713       24145    19530752   83  Linux
> |  /dev/sda6           24145       26090    15624192   82  Linux swap
> |  /dev/sda7           26090       28522    19529728   83  Linux
> 
> I did a minimal ‘server type’ install of debian squeeze in /dev/sda7 and
> downloaded the Xen kernel and other packages per the debian wiki. 
> 
> Now, I am a confused as to what to do next. 
> 
> The laptop currently boots off of the default grub2 bootloader installed
> in the /dev/sda5 ubuntu 10.10 partition. I understand I need to manually
> add a ‘Xen’ stanza pointing to /dev/sda7 and the Xen kernel to for
> instance /etc/grub.d/40_custom - and run ‘update-grub’ so that I end up
> with the corresponding entry in /boot/grub/grub.cfg, but I can't seem to
> find any sample or description of how I should code this additional
> stanza.
> 
> By fiddling with grub interactively, I eventually came up with a stanza
> that looks something like:
> 
> | menuentry "Xen ..."
> | insmod ext2
> | set root=(hd0,7)
> | multiboot /boot/xen4.0-686.2.32.5.gz
> | module /boot/vmlinuz-xen-686.2.32.5.gz
> | module /boot/initrd-xen-686.2.32.5.gz
> 
> This¹ actually boots ‘something’, presumably my initrd but the boot
> messages go by too quickly for me to tell what is actually going on or
> see if there are any errors. 
> 
> Eventually, after displaying messages re: USB initialization, the boot
> process stops and when I hit enter, the following prompt is displayed:
> 
> | (initramfs)
> 
> This is apparently some form of minimal shell where I can enter basic
> commands, such as ‘mount’, ‘ps’.. ’ping’.. ’route’, etc. and even run
> ‘top’.
> 
> But, as far as I can tell, my root partition is not mounted.
> 
> Has anyone a working environment based on debian squeeze and Xen 4.0,
> and if so, could they either point me to the documentation that they
> used or even post a sample grub2 stanza?
> 
> Thanks,
> 
> cj
> 
> ¹ Probably not the actual file names in the sample stanza above.

Hmm.. 

If my question is completely [OT] .. maybe s/o could point me to the
proper place to ask .. ?

Or is Xen is unusuitable for what I have in mind, namely running
different systems concurrently on my laptop..?

Thanks,

cj

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