[Users] Using python sdk to find the VMs running on a host.

[Itamar Heim]

On 06/25/2013 12:30 PM, Deepthi Dharwar wrote:
> On 06/25/2013 11:58 AM, Itamar Heim wrote:
>> On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
>>> Hi,
>>>
>>> I am using the ovirt-python-sdk to figure out if the host is idle or
>>> not. The way to determine if the host is idle at a given instant is
>>> finding out the number of VMs running on it. If the number of VMs = 0
>>> implies host is idle.
>>
>> adding michael for the rest of the question, but please note to check
>> for SPM role of a host before assuming it is idle.
>
> Yes, that is essential. Thanks for pointing it out.
>
>
>> also, may i ask what you are trying to accomplish (it sounds like a
>> power saving policy)?
>
> Yes, I was looking to tweak the power saving policy to switch off
> hosts that have no VMs running on them. Looks like doing it within the
> ovirt-engine is better option than through scripts and SDK.

you should soon be able to write it via python sdk/scripts integrated 
with the engine via:
http://www.ovirt.org/Features/oVirtSchedulerAPI

>
>>>
>>> I was exploring the python sdk to figure out Host-VMs mapping i.e What
>>> are the VMs running on the different host.
>>>
>>> Looks like the only way to find this, is to query each VM in /api/vms
>>> list to get the host on which it is running.
>>>
>>> Is this the right way ? Is there no direct query or REST API to list
>>> the VMs running on a given host at that instant.
>>>
>>> I was looking to get the data center hierarchy structure.
>>> Number_of_datacenters
>>>         |
>>>         V
>>> clusters in each data center
>>>         |
>>>         V
>>> Hosts in each cluster
>>>         |
>>>         V
>>>    VMs on each host.
>>>
>>> This kind of mapping as seen on the GUI. Is there any way to obtain
>>> the same from the ovirt-python-sdk ?
>>>
>>> With this information, this would help me write scripts to turn-off my
>>> hosts if idle automatically and power them on as required.
>>>
>>> Regards,
>>> Deepthi
>>>
>>>
>>>
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>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>
>>
>>
>