Re: [ovirt-users] SLA : RAM scheduling

From: "Nathanaël Blanchet" <blanchet(a)abes.fr&gt; To: "Gilad Chaplik" <gchaplik(a)redhat.com&gt; Cc: "Karli Sjöberg" <Karli.Sjoberg(a)slu.se&gt;, "users" <users(a)ovirt.org&gt; Sent: Wednesday, May 28, 2014 6:26:16 PM Subject: Re: [ovirt-users] SLA : RAM scheduling 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@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@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(a)abes.fr&gt; >> To: "Gilad Chaplik" <gchaplik(a)redhat.com&gt; >> Cc: "Karli Sjöberg" <Karli.Sjoberg(a)slu.se&gt;, "users" <users(a)ovirt.org&gt; >> 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(a)abes.fr&gt; >>>> To: "Karli Sjöberg" <Karli.Sjoberg(a)slu.se&gt; >>>> Cc: "users" <users(a)ovirt.org&gt; >>>> 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(a)abes.fr&gt; : >>>>> 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(a)abes.fr >>>>> >>>>> _______________________________________________ >>>>> Users mailing list >>>>> Users(a)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(a)abes.fr >>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users(a)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(a)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(a)abes.fr