Re: [Xen-users] how can you boot an existing linux domU off the cdrom on sles11 dom0?

[James Pifer <jep@xxxxxxxxxxxxxxxx>]

On Thu, 2010-04-22 at 15:14 -0500, Donny Brooks wrote:
> 
> On Thursday, April 22, 2010 03:06 PM CDT, James Pifer <jep@xxxxxxxxxxxxxxxx> 
> wrote: 
>  
> > On Thu, 2010-04-22 at 15:02 -0500, Steven Timm wrote:
> > > What type of file system does the domU have, it may be possilbe
> > > to stop the domU and mount the file system on dom0 and make
> > > the change that way.
> > > 
> > > Steve
> > 
> > I was thinking that too and I can mount the filesystem, but the domU
> > needs to be booted with the new devices attached to see how to change
> > fstab/menu.lst. 
> > 
> > James
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>  
> 
> Booting a domu from "CD" should be easy. I do it all the time but I
> use iso files instead. Basically, just edit your config file for the
> specific domu to include the /dev/cdrom (in the case of a physical
> drive) or the iso location and change the boot order. These vary
> depending on if you use libvirt, xen-tools, or other on exactly how
> you edit it though.
>  
> 

It should be, but in practice hasn't been for me. Let me ask you this.
There seems to be multiple ways to modify the environment. On my servers
I currently use virt-manager for starting and stopping vms. You can also
make some changes to configs, which is where I added the pass through
for the scsi card. I assume this updates the xen store?

You can also do the following:
xm list -l vmname > vmname.conf
xm delete vmname
edit the conf file as needed
xm new -F vmname.conf

Then there's also some type of configuration file under /etc/xen/vm that
looks like:
name="vmtest03"
uuid="d5bfecad-e163-3661-1732-448c61a6a213"
memory=512
maxmem=512
vcpus=4
on_poweroff="destroy"
on_reboot="restart"
on_crash="destroy"
localtime=0
keymap="en-us"
builder="linux"
bootloader="/usr/lib/xen/boot/domUloader.py"
bootargs="--entry=xvdb1:/boot/vmlinuz-xenpae,/boot/initrd-xenpae"
extra=" "
disk=[ 'phy:/dev/sr0,xvda:cdrom,r',
'file:/var/lib/xen/images/vmtest03/disk1,xvdb,w', ]
vif=[ 'mac=00:16:3e:29:83:e6,bridge=br0', ]
vfb=['type=vnc,vncunused=1']

So which way are you saying to edit the config? I have no problem using
an iso, but my experience has been, even after adding a cdrom, that it
sill boots from the hard disk, not the specified cdrom. 

Can you outline a few steps on how it should work?

Thanks,
James







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