If a domain isn't running, it won't have a dynamically assigned MAC address
assigned.
Starting with Xen 3.0.4, "xm new" keeps a "persistent config" copy to remember
the config when a domain isn't running.
The virsh equivalent to this is "virsh define". When you "virsh define
config.sxp", that will be parsed by libvirt and turned into an "xm new"
persistent config.
Under Solaris xVM, xend keeps this "persistent config" copy in
/var/lib/xend/domains/${uuid}/config.sxp
That's that "nasty LISPish" SXP format.
You are correct in that only running domains are shown using the xenstore
tools, as the only time xenstored (which hooks into the xen hypervisor xenstore
with callbacks, etc) are aware of a domain's configuration is when the domain
is running.
Hope this helps.
- Ian C. Blenke <[email protected]> <[email protected]> http://ian.blenke.com/
On 3/2/09 1:21 PM, "Joseph Mocker" <[email protected]> wrote:
Will the xenstore method get all VMs or just running VMs? With my
limited use of the xenstore commands I recall seeing the later behavior.
--joe
Ian Blenke wrote:
> This seems to come up every few months.
>
> If you're dead set on shell scripting it, there are always the xenstore
> commands.
>
> You're probably used to seeing the SXP formatted format of "xm list -l".
> That's a bit difficult to parse using shell tools. Try this instead:
>
> /usr/lib/xen/bin/xenstore-ls
>
> To list all of the VMs and their MAC address, you could use:
>
> /usr/lib/xen/bin/xenstore-list /vm | while read uuid ; do
> echo $(/usr/lib/xen/bin/xenstore-read /vm/${uuid}/name \
> /vm/${uuid}/device/vif/0/mac ) ; \
> done
>
> Hope this helps.
>
> - Ian Blenke <[email protected]> <[email protected]> http://ian.blenke.com/
>
> On 3/2/09 12:46 AM, "David Edmondson" <[email protected]> wrote:
>
>
>> On 28 Feb 2009, at 11:01pm, James Adams wrote:
>>
>>
>>> I'm creating a new domU using 'virsh create <xmlfile>' without
>>> specifying the MAC address within the XML file, under the assumption
>>> that the dom0 or hypervisor generates the MAC address for me. Next
>>> I'd like to get the MAC address that was assigned to this new domU,
>>> and I don't see a way to get that information from the command line
>>> via virsh or xm. The closest thing I've found is that you can use
>>> 'xm info' and it will give you some MAC address-looking values in
>>> its hw_caps line, but I can't find any documentation which explains
>>> how to interpret these values and whether or not they're actually
>>> related to any of the domUs. I'd like to leverage a shell command
>>> if possible for this since I'm communicating with the machine that
>>> is running xVM via ssh from a Java program. Can anyone give me any
>>> suggestions on how I'd go about doing this?
>>>
>> As Andrew says, dumping the configuration of the domain is the right
>> way to go. I'd encourage you to parse the XML with a more complete
>> tool than 'grep' though ;-)
>>
>> _______________________________________________
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>> [email protected]
>>
>>
>
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>
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