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RE: [Xen-users] Convert CentOS system to Xen image?

To: "James Pifer" <jep@xxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Convert CentOS system to Xen image?
From: "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>
Date: Wed, 2 Apr 2008 16:57:11 -0400
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Thread-topic: [Xen-users] Convert CentOS system to Xen image?
James Pifer wrote:
> > Well, your almost there, but you need to boot up an OS recovery iso
> > in the HVM and reinstall grub as the primary disk will now be 'hda'
> > instead of whatever the other server's was, probably 'sda', or
> > 'md0' if it had software raid.
> > 
> > Once you have it running install the xen PV kernel, use disklabels
> > for non-LVM volumes in your fstab and grub and then shut it down
> > and convert the config to PVM. Boot with 'xm create -c <config'
> > so you see the grub menu and select the xen kernel. Once you
> > have the PVM running, set it's kernel as the default in grub.
> I tried to do that. Since it's full virt does an actual CD need to be
> inserted in the box? I tried adding a virtual CDROM using the ISO, but
> it will not boot off of it. 

Best thing to do is write up a command-line config for your little
domain. Try this to get started (put your specifics where needed):

kernel = "/usr/lib/xen/boot/hvmloader"
memory = 512
name = "MyDomain"
guest_os_type = 'linux'
vif = [ 'type=ioemu, bridge=xenbr0' ]
disk = [ 'phy:/dev/vg0/lv3,hda,w', 'file:/tmp/rescue.iso,hdc,r' ]

This should boot into d=cdrom first, then c=hard disk second, followed
by n=network (PXE) third, followed by a=floppy last.

> On the screen I have
> ata0 master is the qemu hard disk.
> ata0 slave is Unknown device.

Not sure which screen you are talking about here, still using
virt-manager? Drop it and start writing config files.

The options are documented in the examples in /etc/xen directory.

> I installed a xen PV kernel on the live server before grabbing it. 

Good fore thought, that'll save a step later.


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