[fedora-virt] How can we pass kernel arguments(e.g:ks=hd:/dev/..) to a cdrom-based guest install?

[Dor Laor]

On 02/04/2010 03:51 PM, James Laska wrote:
> On Thu, 2010-02-04 at 10:38 +0000, Daniel P. Berrange wrote:
>> On Thu, Feb 04, 2010 at 10:45:37AM +0800, Li Ming wrote:
>>> Hi,
>>>      How can I pass the ks argument to a guest during install? I am
>>> writing an auto install python script,I can use virt-install --location
>>> install_tree --extra-args ks=...., but this will active the network, we
>>> want to mirror a true DVD install. If use virt-install --cdrom will
>>> solve this issue, we have a bad way to pass ks argument,uncompress the
>>> ISO,update the syslinux kernel args,then build the ISO again,but this
>>> will consume big resource,not a good way. Does someone have good
>>> suggestion for me to pass ks arg to kernel while using virt-install
>>> --cdrom in python script?
>>
>> It is only posible to pass kernel boot args when booting off kernel/initrd
>> direction (ie --location).  With --cdrom the BIOS is in charge. So if you
>> need to pass args, then you'll have to modify your ISO image to include
>> them directly.
>
> We can certainly try modifying the ISO image itself, but we'd prefer
> leaving the ISO image pristine if possible.
>
> Does the KVM autotest suite have any workarounds or example methods for
> modifying the boot args when booting an ISO image?  Perhaps running

KVM autotest uses qemu directly and there is no issue there, -cdrom do 
tell the bios where to boot from but -kernel still has the right effect.

> virt-viewer and _somehow_ issuing keyboard events to adjust the boot
> args appropriately?  Or, can an ISO be mounted as a disk in the guest
> and modified somehow using libguestfs?
>
> Thanks,
> James
>
>
>
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