[ovirt-users] SLA : RAM scheduling

Wed May 28 11:26:16 EDT 2014

Hi Gilad,

I followed your instructions, but it didn't work for me, I think for 
many reasons.

Le 26/05/2014 16:22, Gilad Chaplik a écrit :
> Hi Nathanaël,
>
> happy to assist :) hope it will work in first run:
>
> 1) install the proxy and ovirtsdk.
yum install -y ovirt-scheduler-proxy
> 2) put attached file in the right place (according to docs: ".../plugins"),
according to the docs 
(http://www.ovirt.org/Features/oVirt_External_Scheduling_Proxy), the 
place should be "plugins_path=$PYTHONPATH/ovirt_scheduler/plugins", 
which is should be mentionned in Scheduler conf file 
(/etc/ovirt/scheduler/scheduler.conf), but none of them exists in the 
filesystem!!! I've only found /usr/share/ovirt-scheduler-proxy/plugins 
for placing the python file and no scheduler.conf is present where I 
could change that path.
> make sure to edit the file with your ovirt's ip, user at domain and PW.
My engine API can't be reached in http, so there is some work to do this 
with https. Here is what I did : according to 
/usr/lib/python2.6/site-packages/ovirtsdk/api.py, I add insecure=True to 
the chain
connection = API(url='http*s*://host:port',
                              username='user at domain', 
password=''*insecure='True'*)
Maybe it is not enough and it would be useful to add 
validate_cert_chain=False...
> 3) restart proxy service.
> 3) use config tool to configure ovirt-engine:
> * "ExternalSchedulerServiceURL"="http://<ip>:18781/"
The scheduler proxy listens to localhost:18781, none of ips that can be 
filled here will be reached on that port.
> * "ExternalSchedulerEnabled"=true
> 4) restart ovirt-engine service.
> 5) under configure->cluster_policy see that weight function memory_even_distribution was added (should be in manage policy units or /sth- you will see it in the main dialog as well).
> 6) clone/copy currernt cluster's used cluster policy (probably none - prefer it to have no balancing modules to avoid conflicts), name it 'your_name' and attach memory_even_distribution weight (you can leave it as the only weight module in weight section to avoid configuring factors).
> 7) replace cluster's cluster policy with newly created one.
>
> try it out and let me know how goes :-)
>
> Thanks,
> Gilad.
If all above is tru, should be a good idea to update the wiki...
> ----- Original Message -----
>> From: "Nathanaël Blanchet" <blanchet at abes.fr>
>> To: "Gilad Chaplik" <gchaplik at redhat.com>
>> Cc: "Karli Sjöberg" <Karli.Sjoberg at slu.se>, "users" <users at ovirt.org>
>> Sent: Monday, May 26, 2014 12:12:41 PM
>> Subject: Re: [ovirt-users] SLA : RAM scheduling
>>
>> Hi Gilad,
>>
>> Yes, I'm interested in that feature, I'vebegun to read this following
>> your advices
>> http://www.ovirt.org/Features/oVirt_External_Scheduling_Proxy, I don't
>> think I will have time enough to get it work quickly, I'm not
>> experienced enough with this kind of feature, unless you help me.
>>
>> Le 24/05/2014 10:49, Gilad Chaplik a écrit :
>>> Hi Nathanaël,
>>>
>>> You have 2 ways to get what you're after (quick/slow):
>>> 1) install 'oVirt's external scheduling proxy', and write an extremely
>>> simple weight function that orders hosts by used memory, then add that to
>>> your cluster policy.
>>> 2) open an RFE for oVirt 3.4 to have that in
>>> (https://bugzilla.redhat.com/enter_bug.cgi?product=oVirt).
>>>
>>> let me know if you consider (1), and I'll assist.
>>>
>>> anyway I suggest you'll open an RFE for 3.5.
>>>
>>> Thanks,
>>> Gilad.
>>>
>>> ----- Original Message -----
>>>> From: "Nathanaël Blanchet" <blanchet at abes.fr>
>>>> To: "Karli Sjöberg" <Karli.Sjoberg at slu.se>
>>>> Cc: "users" <users at ovirt.org>
>>>> Sent: Friday, May 23, 2014 7:38:40 PM
>>>> Subject: Re: [ovirt-users] SLA : RAM scheduling
>>>>
>>>> even distribution is for cpu only
>>>>
>>>> Le 23/05/2014 17:48, Karli Sjöberg a écrit :
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Den 23 maj 2014 17:13 skrev =?ISO-8859-1?Q?Nathana=EBl_Blanchet?=
>>>> <blanchet at abes.fr> :
>>>>> Le 23/05/2014 17:11, Nathanaël Blanchet a écrit :
>>>>>> Hello,
>>>>>> On ovirt 3.4, is it possible to schedule vms distribution depending on
>>>>>> host RAM availibility?
>>>>>> Concretly, I had to manually move vms all the vms to the second host
>>>>>> of the cluster, this lead to reach 90% occupation of memory on the
>>>>>> destination host. When my first host has rebooted, none vms of the
>>>>>> second host automatically migrated to the first one which had full
>>>>>> RAM. How to make this happen?
>>>>>>
>>>>> ... so as to both hosts be RAM evenly distributed... hope to be enough
>>>>> clear...
>>>> Sounds like you just want to apply the cluster policy for even
>>>> distribution.
>>>> Have you assigned any policy for that cluster?
>>>>
>>>> /K
>>>>
>>>>> --
>>>>> Nathanaël Blanchet
>>>>>
>>>>> Supervision réseau
>>>>> Pôle exploitation et maintenance
>>>>> Département des systèmes d'information
>>>>> 227 avenue Professeur-Jean-Louis-Viala
>>>>> 34193 MONTPELLIER CEDEX 5
>>>>> Tél. 33 (0)4 67 54 84 55
>>>>> Fax 33 (0)4 67 54 84 14
>>>>> blanchet at abes.fr
>>>>>
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>> Users at ovirt.org
>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>> --
>>>> Nathanaël Blanchet
>>>>
>>>> Supervision réseau
>>>> Pôle exploitation et maintenance
>>>> Département des systèmes d'information
>>>> 227 avenue Professeur-Jean-Louis-Viala
>>>> 34193 MONTPELLIER CEDEX 5
>>>> Tél. 33 (0)4 67 54 84 55
>>>> Fax  33 (0)4 67 54 84 14 blanchet at abes.fr
>>>>
>>>> _______________________________________________
>>>> Users mailing list
>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>> --
>> Nathanaël Blanchet
>>
>> Supervision réseau
>> Pôle exploitation et maintenance
>> Département des systèmes d'information
>> 227 avenue Professeur-Jean-Louis-Viala
>> 34193 MONTPELLIER CEDEX 5
>> Tél. 33 (0)4 67 54 84 55
>> Fax  33 (0)4 67 54 84 14
>> blanchet at abes.fr
>>
> >

-- 
Nathanaël Blanchet

Supervision réseau
Pôle exploitation et maintenance
Département des systèmes d'information
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 	
Tél. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
blanchet at abes.fr

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