Re: KVM-74: HELP PLEASE - cannot boot from cdrom for recovery

Gerry Reno
2009-03-31T19:11:49Z

Gerry Reno wrote:
> Gerry Reno wrote:
>> Tomasz Chmielewski wrote:
>>> Gerry Reno schrieb:
>>>
>>>>> What does:
>>>>>
>>>>> md5sum /dev/sr0
>>>>>
>>>>> output?
>>>>>
>>>>>
>>>> DVD is Fedora 10 DVD (i386)
>>>>
>>>> Four cases:
>>>>
>>>> # desktop user; DVD unmounted
>>>> $ md5sum /dev/sr0
>>>> md5sum: /dev/sr0: Input/output error
>>>>
>>>> # desktop user; DVD mounted
>>>> $ md5sum /dev/sr0
>>>> ff311b322c894aabc4361c4e270f5a3f /dev/sr0
>>>
>>> Download the iso file to your disk and point kvm there.
>>>
>>> It's the easiest to do; your problem is not really kvm-specific.
>>>
>>>
>> I'll try that but it seems as though the process being owned by root
>> is preventing the access to the cdrom. So isn't that kvm? Does
>> libvirt know this? I mean never once have we been able to use the
>> cdrom from the VM. Not just for this problem. This seems to be some
>> kind of access problem.
>>
>>
> Ok, using an F10 ISO file when get access denied error when trying to
> define the domain. So I did this: chcon -t virt_image_t F10-ISO-FILE
> and now the domain defines ok. BUT, even then using the ISO file we
> still get the same error message as always:
> Boot Failure Code: 0003
> Boot from CDROM failed: cannot read the boot disk.
> FATAL: No bootable device.
>
>
> The host runs with SELinux targeted enforce. So thinking this might
> be an selinux issue I set 'setenforce 0' to put it into permissive
> mode but it made no difference. Still the same boot error.
> Boot Failure Code: 0003
> Boot from CDROM failed: cannot read the boot disk.
> FATAL: No bootable device.
>
We even tried setting the 'hvm' boot device to be 'cdrom' and it
automatically tries to boot from the cdrom but it still gets the same
0003 error as before.

Is there no way to recovery this VM? Seems like we fell into a trap
with no escape.

Regards,
Gerry