Re: Unable to boot Fedora LiveCD from USB pendrive with qemu-system

[Marcin Zajączkowski]

Thanks Thomas and Pascal for your replies!

In the end, it turned out that transferring boot image to my old
pendrive multiple times exceeded its durability. With the new one, I was
able to boot without any problem with two my warrants as well as yours :).


Thanks
Marcin



On 2021-11-08 17:23, Thomas Huth wrote:
> On 07/11/2021 16.30, Marcin Zajączkowski wrote:
>> Hi. Having some (dracut-related) issues with a Fedora LiveCD installed
>> on a pendrive, I wanted to play with it using qemu instead of a real
>> computer. Unfortunately, while the pendrive boot fine in real, with
>> qemu, I ended up with "Booting from Hard Drive..." displayed and 2
>> vCores working on 100% for several minutes (until I interrupted it).
>> Most likely, it is a problem with the way I try to achieve that:
>>
>>> sudo qemu-system-x86_64 -enable-kvm -m 4196 -drive
>>> file=/dev/sdb,format=raw,index=0,media=disk -boot menu=on
>>
>> or more "dangerous" variant:
>>> sudo qemu-system-x86_64 -enable-kvm -m 4196 -hda /dev/sdb -boot menu=on
> 
> IIRC that will attach the disk as an IDE drive to your guest. And I
> guess the initrd of your guest does not contain the right kernel modules
> for this interface.
> 
>> What could be wrong with that approach? What is the best way to boot a
>> VM using a bootable disk connected as a USB device (here recognized as
>> /dev/sdb)?
> 
> Not sure, but you could try to attach it as (emulated) USB device to
> your guest, too, by using something like:
> 
>  -drive if=none,id=d1,file=... -device usb-storage,drive=d1
> 
>  HTH,
>   Thomas
>