Re: [libvirt-users] Guest interface info under ESX driver
2011/1/31 Sengor <sengork(a)gmail.com>:
Hi Justin,
Thanks. I did come across that post, but was hoping there'd be a more
contained method of finding the domain's IP address without needing to
do ARP/MAC lookups or query the DHCP server itself.
Currently libvirt doesn't provide a function to get the IP address of
a domain's network interface.
Might be a useful addition as libvirt can know/determine the IP
address in several cases.
The following does not display the IP either for an ESX guest
'testvm':
virsh # dumpxml testvm
...
<interface type='bridge'>
<mac address='00:0c:29:09:ab:2c'/>
<source bridge='VM Network'/>
</interface>
...
The domain XML doesn't contain the IP address (yet).
With VMware tools installed in the guest it might be possible to
obtain the IP address via the vSphere API, I didn't test this yet.
But libvirt doesn't have a function to expose this information yet.
Looking around the libvirt Python bindings reveals class
virInterface
from lib/site-packages/libvirt.py with the following function:
def XMLDesc(self, flags):
"""VIR_INTERFACE_XML_INACTIVE - return the static configuration,
suitable for use redefining the
interface via virInterfaceDefineXML()
Provide an XML description of the interface. If
VIR_INTERFACE_XML_INACTIVE is set, the description may be reused
later to redefine the interface with virInterfaceDefineXML(). If it
is not set, the ip address and netmask will be the current live
setting of the interface, not the settings from the config files.
"""
ret = libvirtmod.virInterfaceGetXMLDesc(self._o, flags)
if ret is None: raise libvirtError ('virInterfaceGetXMLDesc()
failed', net=self)
return ret
This looks promising (if it indeed does work for ESX driver), however
I've not figured out how to use this particular class/function yet. So
far unable to find any examples on the web...
virInterface is for the host network interfaces, this is not what
you're looking for.
Lastly I cannot tell whether this is supported at all for the ESX
driver given the current driver support matrix:
http://www.libvirt.org/hvsupport.html
This matrix is quite outdated, and needs to be updated :(
Matthias
On Mon, Jan 31, 2011 at 4:22 PM, Justin Clift <jclift(a)redhat.com> wrote:
> On 30/01/2011, at 11:19 PM, Sengor wrote:
>> Hi,
>>
>> Is there a way to fetch the current IP address of a running guest
>> domain (with VMware Tools installed) running on an ESX host?
>>
>> Ideally this would be doable via the libvirt Python bindings.
>
> Hi Sengor,
>
> Does this help?
>
> https://rwmj.wordpress.com/2010/10/26/tip-find-the-ip-address-of-a-virtual-machine/
>
> I'm unsure about it's interaction with vSphere/ESX though.
>
> Regards and best wishes,
>
> Justin Clift
--
sengork
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