[Pacemaker] starting a xen-domU depending on available hardware-resources using SysInfo-RA

Thu Sep 30 15:31:24 UTC 2010

On Thu, Sep 30, 2010 at 2:52 PM, Vadym Chepkov <vchepkov at gmail.com> wrote:
>
> On Sep 30, 2010, at 2:35 AM, Sascha Reimann wrote:
>
>> Hi Dejan,
>>
>> it's working fine with the amount of free ram as the score and a bigger default-resource-stickiness:
>>
>> primitive v01 ocf:heartbeat:Xen \
>>       params xmfile="/etc/xen/conf.d/v01.cfg" \
>>       op monitor interval="30s" timeout="30s" \
>>       op start interval="0" timeout="60s" \
>>       op stop interval="0" timeout="40s" allow-migrate="true" \
>>       meta target-role="Started"
>> primitive v02 ocf:heartbeat:Xen \
>>       params xmfile="/etc/xen/conf.d/v02.cfg" \
>>       op monitor interval="30s" timeout="30s" \
>>       op start interval="0" timeout="60s" \
>>       op stop interval="0" timeout="40s" allow-migrate="true" \
>>       meta target-role="Started"
>> primitive v03 ocf:heartbeat:Xen \
>>       params xmfile="/etc/xen/conf.d/v03.cfg" \
>>       op monitor interval="30s" timeout="30s" \
>>       op start interval="0" timeout="60s" \
>>       op stop interval="0" timeout="40s" allow-migrate="true" \
>>       meta target-role="Started"
>> location RAM01-v01 v01 \
>>       rule $id="loc-resv01-rule" ram_free: ram_free gt 6000
>> location RAM01-v02 v02 \
>>       rule $id="loc-resv02-rule" ram_free: ram_free gt 3000
>> location RAM01-v03 v03 \
>>       rule $id="RAM01-v03-rule" ram_free: ram_free gt 1000
>> property $id="cib-bootstrap-options" \
>>       dc-version="1.0.9-74392a28b7f31d7ddc86689598bd23114f58978b" \
>>       cluster-infrastructure="openais" \
>>       expected-quorum-votes="4" \
>>       stonith-enabled="false" \
>>       default-resource-stickiness="16000" \
>>       last-lrm-refresh="1285761587"
>>
>> thanks!
>
> Hmm, correct me if I am wrong, but these rules won't migrate a VM anywhere unless some dom0 has more then 16000 of ram, no?
> I don't think this is what you wanted.
>
> And on a related note, why are there two different SysInfo agents?

because of the split

> Which one is supported?

the pacemaker one

>
> /usr/lib/ocf/resource.d/heartbeat/SysInfo
> /usr/lib/ocf/resource.d/pacemaker/SysInfo
>
> Thanks,
> Vadym
>
>>
>> On 09/28/2010 12:18 PM, Dejan Muhamedagic wrote:
>>> Hi,
>>>
>>> On Tue, Sep 28, 2010 at 11:00:18AM +0200, Sascha Reimann wrote:
>>>> howdy!
>>>>
>>>> I'm trying to configure a resource (xen-domU) that could start on 2
>>>> nodes (preferred on node server01):
>>>>
>>>> primitive v01 ocf:heartbeat:Xen \
>>>>     params xmfile="/etc/xen/conf.d/v01.cfg" allow-migrate="true"
>>>> location loc-v01p v01 200: server01
>>>> location loc-v01s v01 100: server02
>>>>
>>>> That's working fine so far, but I want to ensure that there's enough
>>>> hardwareresources available on server01, so I've set up a modified
>>>> SysInfo-RA to put the ram_total and ram_free values of xen (xm
>>>> info|awk '/free_memory/ {print $3}') to the statusinformation of the
>>>> CIB:
>>>>
>>>> server01:~$ cibadmin -Q -o status|grep status-server01-ram
>>>> <nvpair id="status-server01-ram_total" name="ram_total" value="8191"/>
>>>> <nvpair id="status-server01-ram_free" name="ram_free" value="2000"/>
>>>>
>>>> This is working fine, too. BUT:
>>>>
>>>> When I create a rule like the one below, the xen-domU keeps
>>>> restarting (or moving to server02 where the same happens), which is
>>>> correct since the SysInfo-RA updates the statusinformation to
>>>> value="0" after a start and back to value="2000" after a stop in
>>>> this example.
>>>>
>>>> location loc-resv01 v01 \
>>>>     rule $id="loc-resv01-rule" -inf: ram_free lt 2000
>>>
>>> An interesting issue :-)
>>>
>>> Well, you can introduce resource stickiness and use that to
>>> outweigh the negative score coming from the lack of memory (use
>>> something less than inf). You may also consider using the amount
>>> of free memory as a score.
>>>
>>> HTH,
>>>
>>> Dejan
>>>
>>>> Can anybody help?
>>>>
>>>> _______________________________________________
>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
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>>>> Project Home: http://www.clusterlabs.org
>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>>
>>
>> --
>> Für weitere Fragen stehen wir Ihnen gerne zur Verfügung.
>>
>> Mit freundlichen Grüßen
>>
>> Sascha Reimann
>>
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>> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>
>
> _______________________________________________
> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
>