[libvirt-users] virsh update-device issues

[Martin Kletzander]

On Tue, Jul 01, 2014 at 06:06:01PM +0400, Oleg Bondarev wrote:
>Hi,
>
>I faced a couple of issues with libvirt update-device function:
>
> 1. http://libvirt.org/hvsupport.html says that virDomainUpdateDeviceFlags
>is supported since 0.8.0 API version in qemu driver.
>However when trying to update network device (changing source bridge of the
>interface) on Ubuntu with 0.9.8 libvirt version I get the following error:
> "*this function is not supported by the connection driver: cannot modify
>network device configuration"*
>What may be the reason for such error?
>
> 2. Not able to rename target device name of an interface. For example if
>have running instance with interface:
>
>*    <interface type='bridge'>*
>*      <mac address='fa:16:3e:80:f4:49'/>*
>*      <source bridge='qbre1894135-13'/>*
>*      <target dev='vnet0'/>*
>*      <model type='virtio'/>*
>*      <alias name='net0'/>*
>*      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
>function='0x0'/>*
>*    </interface>*
>
>and then try to update:
>
>  *$ sudo virsh update-device --persistent --config --live 1 dev.xml*
>
>where dev.xml:
>
>*    <interface type='bridge'>*
>*      <mac address='fa:16:3e:80:f4:49'/>*
>*      <source bridge='qbre1894135-13'/>*
>*      <target dev='tap123'/>*
>*      <model type='virtio'/>*
>*    </interface>*
>
>I get:
>
>*  error: Failed to update device from dev.xml*
>*  error: Operation not supported: cannot modify network device tap name*
>
>This happens even if rename vnet0 to tap123 manually with *ip link set
>vnet0 name tap123* before interface update.
>And after instance reboot tap123 is renamed back to vnet0.
>Is there a strong reason to not allow modifying network device tap name?
>

To be honest, I don't know how exactly this works, but does it work if
you try updating it without --live?  Probably nobody added the support
for changing the device name live; that would be my guess.

Martin

>Will appreciate any assistance with  the described issues.
>
>Thanks,
>Oleg

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