[ovirt-users] workflow suggestion for the creating and destroying the VMs?

[Yaniv Kaul]

On Fri, Jul 21, 2017 at 12:06 PM, Arman Khalatyan <arm2arm at gmail.com> wrote:

> thanks,the downscaling is important for me,
>

It really depends on the guest OS cooperation. While off-lining a CPU is
relatively easy, hot-unplugging memory is a bigger challenge for the OS.

 i was testing something like:
>  1) clone from actual vm(super slow,even if it is 20GB OS, needs more
> investigation,nfs is bottle neck)
> 2) start it with dhcp,
> 3) somehow find the ip
> 4) sync parameters between running vm and new vm.
>
> looks that everything might be possible with the python sdk...
>
> are there some examples or tutorials with cloudinitscripts?
>

https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/start_vm_with_cloud_init.py

But you could also use Ansible, might be even easier:
http://docs.ansible.com/ansible/latest/ovirt_vms_module.html#examples

Y.


>
> Am 21.07.2017 3:58 nachm. schrieb "Yaniv Kaul" <ykaul at redhat.com>:
>
>>
>>
>> On Fri, Jul 21, 2017 at 6:07 AM, Arman Khalatyan <arm2arm at gmail.com>
>> wrote:
>>
>>> Yes, thanks for mentioning puppet, we have foreman for the bare metal
>>> systems.
>>> I was looking something like preboot hook script, to mount the /dev/sda
>>> and copy some stuff there.
>>> Is it possible to do that with cloud-init/sysprep?
>>>
>>
>> It is.
>>
>> However, I'd like to remind you that we also have some scale-up features
>> you might want to consider - you can hot-add CPU and memory to VMs, which
>> in some workloads (but not all) can be helpful and easier.
>> (Hot-removing though is a bigger challenge.)
>> Y.
>>
>>>
>>> On Thu, Jul 20, 2017 at 1:32 PM, Karli Sjöberg <karli at inparadise.se>
>>> wrote:
>>>
>>>>
>>>>
>>>> Den 20 juli 2017 13:29 skrev Arman Khalatyan <arm2arm at gmail.com>:
>>>>
>>>> Hi,
>>>> Can some one share an experience with dynamic creating and removing VMs
>>>> based on the load?
>>>> Currently I am just creating with the python SDK a clone of the apache
>>>> worker, are there way to copy some config files to the VM before starting
>>>> it ?
>>>>
>>>>
>>>> E.g. Puppet could easily swing that sort of job. If you deploy also
>>>> Foreman, it could automate the entire procedure. Just a suggestion
>>>>
>>>> /K
>>>>
>>>>
>>>> Thanks,
>>>> Arman.
>>>>
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>>>>
>>>>
>>>
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>>
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