libvirt users - Jan 2016 - Unable to retrieve Guest IP Addresses via libvirt API

Hi ,

Despite the fact that my Guest has an IP address , by running  this piece of
code on a KVM host :

     ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE, NULL);
     ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT, NULL);


I'm not able to get a  ifaces_count  different from -1


Additionnaly :
-  IP Addresses are not present within the xmldesc of this Guest.(not sure that
they should appear there)

I'm running libvirt-1.2.17-13.el7.x86_64

Did I misunderstood something ?

As ovirt manager shows the address correctly , it should be possible to get it
via libvirt ...

Thanks for help.


J.P. Ribeauville


P: +33.(0).1.47.17.20.49
.
Puteaux 3 Etage 5  Bureau 4

jpribeauville@axway.com<mailto:jpribeauville@axway.com>
http://www.axway.com<http://www.axway.com/>



P Pensez à l'environnement avant d'imprimer.

On Thu, Jan 07, 2016 at 07:31:57PM +0000, Jean-Pierre Ribeauville
wrote:
>Hi ,
>
>Despite the fact that my Guest has an IP address , by running  this piece of
code on a KVM host :
>
>     ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE, NULL);
>     ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT, NULL);
>
>
>I'm not able to get a  ifaces_count  different from -1
>
>
>Additionnaly :
>-  IP Addresses are not present within the xmldesc of this Guest.(not sure
that they should appear there)
>
>I'm running libvirt-1.2.17-13.el7.x86_64
>
>Did I misunderstood something ?
>
>As ovirt manager shows the address correctly , it should be possible to get
it via libvirt ...
>
Can you get them using virsh domifaddr?  If yes, look at the code virsh
uses.  If not, then it might be ovirt's workaround using their agent for
older qemu/libvirt/something combinations.
>Thanks for help.
>
>
>J.P. Ribeauville
>
>
>P: +33.(0).1.47.17.20.49
>.
>Puteaux 3 Etage 5  Bureau 4
>
>jpribeauville@axway.com<mailto:jpribeauville@axway.com>
>http://www.axway.com<http://www.axway.com/>
>
>
>
>P Pensez à l'environnement avant d'imprimer.
>
>
>
>_______________________________________________
>libvirt-users mailing list
>libvirt-users@redhat.com
>https://www.redhat.com/mailman/listinfo/libvirt-users

Hi,

My piece of code is inspired from domifaddr one.
Virsh domifaddr doesn't return anything.

Then , it could be useful for me to have a look in ovirt sources  to understand
how it deals with that.
As a  workaround  , it should be  possible to combine a dumpxml to retrieve
Guest MAC addresses and then issue an "arp -an" to retrieve IP
adresses.

Regards,

J.P.

-----Message d'origine-----
De : Martin Kletzander [mailto:mkletzan@redhat.com] 
Envoyé : vendredi 8 janvier 2016 10:36
À : Jean-Pierre Ribeauville
Cc : libvirt-users@redhat.com
Objet : Re: [libvirt-users] Unable to retrieve Guest IP Addresses via libvirt
API

On Thu, Jan 07, 2016 at 07:31:57PM +0000, Jean-Pierre Ribeauville
wrote:
>Hi ,
>
>Despite the fact that my Guest has an IP address , by running  this piece of
code on a KVM host :
>
>     ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE, NULL);
>     ifaces_count = F_virDomainInterfaceAddresses(domain, 
> &ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT, NULL);
>
>
>I'm not able to get a  ifaces_count  different from -1
>
>
>Additionnaly :
>-  IP Addresses are not present within the xmldesc of this Guest.(not 
>sure that they should appear there)
>
>I'm running libvirt-1.2.17-13.el7.x86_64
>
>Did I misunderstood something ?
>
>As ovirt manager shows the address correctly , it should be possible to get
it via libvirt ...
>
Can you get them using virsh domifaddr?  If yes, look at the code virsh uses. 
If not, then it might be ovirt's workaround using their agent for older
qemu/libvirt/something combinations.
>Thanks for help.
>
>
>J.P. Ribeauville
>
>
>P: +33.(0).1.47.17.20.49
>.
>Puteaux 3 Etage 5  Bureau 4
>
>jpribeauville@axway.com<mailto:jpribeauville@axway.com>
>http://www.axway.com<http://www.axway.com/>
>
>
>
>P Pensez à l'environnement avant d'imprimer.
>
>
>
>_______________________________________________
>libvirt-users mailing list
>libvirt-users@redhat.com
>https://www.redhat.com/mailman/listinfo/libvirt-users

On 07.01.2016 20:31, Jean-Pierre Ribeauville wrote:
> Hi ,
> 
> Despite the fact that my Guest has an IP address , by running  this piece
of code on a KVM host :
> 
>      ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_LEASE, NULL);
>      ifaces_count = F_virDomainInterfaceAddresses(domain,
&ifaces,VIR_DOMAIN_INTERFACE_ADDRESSES_SRC_AGENT, NULL);
> 
> 
> I'm not able to get a  ifaces_count  different from -1
You should have also obtained a stringified error that explains what
went wrong. That might give you hint.
> 
> 
> Additionnaly :
> -  IP Addresses are not present within the xmldesc of this Guest.(not sure
that they should appear there)
No. Guest can reconfigure its NICs into something completely different
that does not even match domain XML. For instance - it can create a
bonding over two vNICs. In that case none of vNICs has an IP address -
it's the bonding device that has it. However, the bonding device itself
is not reported in the domain XML.

But maybe more importantly, I consider IP address as a guest runtime
setting, not a part of hardware. And as such it falls out of domain XML
scope where domain HW is configured. If we were reporting IP addresses
there why stop only there and why not report other runtime info too?
E.g. some /sys /proc values?

Having said that, I am against reporting IP addresses in domain XML.

Michal