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Re: [Xen-users] Separate kernel on domU's

From: jacek burghardt <jaceksburghardt@xxxxxxxxx>

Date: Wed, 22 Feb 2012 06:28:05 -0700

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Cc: xen-users@xxxxxxxxxxxxx, "Fajar A. Nugraha" <list@xxxxxxxxx>

Delivery-date: Wed, 22 Feb 2012 13:29:20 +0000

List-id: Xen user discussion <xen-users.lists.xen.org>

I store my kernels in /home/xen/boot and this is my config file.

I don't see how kernel could get messed up domu can't write back to dom0.

You can always copy kernel separate dir.

# dom01 Config File
kernel = "/home/xen/boot/vmlinuz-linux"
ramdisk = "/home/xen/boot/initramfs-linux.img"
extra="iommu=soft swiotlb=force"

memory = 2048
name = "archlinuxa"
vif=['bridge=xenbr0,model=e1000,script=vif-bridge']
vfb=['vnc=1,vncunused=1,vnclisten=0.0.0.0,keymap=it']
disk = [ 'phy:/dev/xensvol/archlinuxa,ioemu:xvda,w' ]

root = "/dev/xvda1 ro"
sdl=0
serial='pty'
acpi = 1
apic = 1
pae=1
usb=1

usbdevice='tablet'

>on_reboot = 'restart'
on_crash = 'restart'

On Wed, Feb 22, 2012 at 5:37 AM, eva <evammg@xxxxxxxxx> wrote:

On 22 February 2012 13:05, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
> On Wed, Feb 22, 2012 at 6:28 PM, eva <evammg@xxxxxxxxx> wrote:
>> At this point I am a bit lost.
>
> :D
>
> Too much information for newbies, perhaps.
>
>>
>> I have searched information about this but it's still not clear to me.
>>
>> It seems that Xen hypervisor shares the kernel with domU's,
>
> No.
>
> domU can use the same kernel as dom0, and sometimes it can share the
> same initrd as well.
>
>> but this
>> is not recommended because it makes it can easily mess it all up..
>
> "easily" is a relative term, and some might not agree with that
> statement, but IMHO yes.
>
>> But, with an option through xen-tools you can create a domU with a
>> separate kernel..
>
> Probably. I don't use xen-tools.
>
>>does that mean that uses a stub domain?
>
> stub domain is another beast altogether. Better forget about that for now.
>
>> I'd appreciate any hint about how Xen works here.
>
> A good howto for Ubuntu domU installation is here:
> http://wiki.xen.org/wiki/Ubuntu_10.04_domU
>
> Some of it should apply to debian as well.
>
> --
> Fajar

Thanks, I've got homework to do now.

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