libvirt users - May 2014 - Updating domain XML issue

I'm trying to unmount a guest cdrom using libvirt_domain_update_device 
(via php-libvirt).  The guest cdrom is currently mounted via Ceph, via 
this XML:

<disk type='network' device='cdrom'>
     <driver name='qemu' type='raw'/>
     <auth username='cdroms'>
         <secret type='ceph' uuid='XXXX'/>
     </auth>
     <source protocol='rbd' name='cdrom/test'/>
     <target dev='hdc' bus='ide'/>
     <readonly/>
     <address type='drive' controller='0' bus='1'
target='0' unit='0'/>
</disk>

In order to unmount it, I'm trying to use this XML:

<disk type='file' device='cdrom'>
         <driver name='qemu' type='raw'/>
         <target dev='hdc' bus='ide'/>
         <readonly/>
         <alias name='ide0-1-0'/>
         <address type='drive' controller='0' bus='1'
target='0' unit='0'/>
</disk>

However, I'm getting an error from libvirt: 'internal error: invalid 
secret type 'ceph''.  I suspect this is because it's still
trying to use
the authentication information from the old cdrom definition. How do I 
convince it to not do this?  I've tried specifiying an empty <auth/> 
block, but that generates it's own error ('missing username for
auth')

Okay, let's try this another way... how are people dynamically 
attaching/removing cdroms from guests, without requiring a guest restart?

On 5/22/2014 4:14 PM, Brian Rak wrote:
> I'm trying to unmount a guest cdrom using libvirt_domain_update_device 
> (via php-libvirt).  The guest cdrom is currently mounted via Ceph, via 
> this XML:
>
> <disk type='network' device='cdrom'>
>     <driver name='qemu' type='raw'/>
>     <auth username='cdroms'>
>         <secret type='ceph' uuid='XXXX'/>
>     </auth>
>     <source protocol='rbd' name='cdrom/test'/>
>     <target dev='hdc' bus='ide'/>
>     <readonly/>
>     <address type='drive' controller='0' bus='1'
target='0' unit='0'/>
> </disk>
>
> In order to unmount it, I'm trying to use this XML:
>
> <disk type='file' device='cdrom'>
>         <driver name='qemu' type='raw'/>
>         <target dev='hdc' bus='ide'/>
>         <readonly/>
>         <alias name='ide0-1-0'/>
>         <address type='drive' controller='0'
bus='1' target='0'
> unit='0'/>
> </disk>
>
> However, I'm getting an error from libvirt: 'internal error:
invalid
> secret type 'ceph''.  I suspect this is because it's still
trying to
> use the authentication information from the old cdrom definition. How 
> do I convince it to not do this?  I've tried specifiying an empty 
> <auth/> block, but that generates it's own error ('missing
username
> for auth')
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users@redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users

On Thu, May 29, 2014 at 11:52:49AM -0400, Brian Rak
wrote:
> Okay, let's try this another way... how are people dynamically
> attaching/removing cdroms from guests, without requiring a guest restart?
You can't dynamically attach / detach IDE devices at all. If you're
using an IDE cdrom, the most you can do is change the media inserted
in the tray - you can't hotplug the entire device.

I've heard rumours it might be possible to use SCSI CDROM which
might support hotplug, but I've never tried that, so can't say
whether it'll work with libvirt.

Regards,
Daniel
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Hello all,

I'm wondering if in KVM a template is used to create the new VM xml 
config file, and if yes where it's located.
Is it also possible to use a "common" config file with some params to
be
used by all the VMs ? or is it possible to include a common config
file in the .xml ?

Thank you!
Cheers,
Franco