[Pacemaker] using clone score in location

[Geoff Lovett]

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Thank you Andrew, this works well!

For the record,
using colocation proxy-colo inf: proxy_vip proxy_group_clone
using clone-node-max="1" in proxy_group_clone
not using on-fail=standby in squid.

Thanks,
Geoff

Andrew Beekhof wrote:
> On Tue, Sep 1, 2009 at 2:40 AM, Geoff
> Lovett<geoff.lovett at lightningsource.com> wrote:
> Tried "colocation proxy-colo inf: proxy_vip proxy_group"
> 
>> well thats not going to help, you need to use the _clone_, eg.
> 
>>    colocation proxy-colo inf: proxy_vip proxy_pingd_clone
> 
> instead of
> colocation, failed squid, but proxy_vip still says put.
> 
> I came up with a solution, but it's not optimal.  I added
> on-fail="standby" to squid's monitor, and added clone-node-max="1" to
> proxy_group_clone.  This puts the whole node in standby node if squid
> fails, causing proxy_vip to move.  Clone-node-max=1 was necessary to
> keep the failed node's clone from restarting on the healthy one.
> 
> If I had unrelated resources managed by pacemaker on these nodes, this
> would fail those things over also.  Any additional ideas that could
> solve this scenario would be appreciated.
> 
> Thanks!
> Geoff
> 
> Andrew Beekhof wrote:
>>>> On Sat, Aug 29, 2009 at 12:21 AM, Geoff
>>>> Lovett<geoff.lovett at lightningsource.com> wrote:
>>>> Hello all, I'm trying to use a clone's score in a location constraint,
>>>> and it's not going well.  Basically, I've got an IP I want to run on a
>>>> node with any healthy clone.  My clone is of a group.  If any member of
>>>> the group fails to run, I'd like the IP to migrate to a healthy node.
>>>> Currently, after I cause a group member to fail, then the IP does nothing.
>>>>
>>>> Here's output from crm configure show.  I've tried many different
>>>> location commands besides this one:
>>>>
>>>>> Thats your problem, you need a colocation constraint. Not a location one.
>>>> primitive dansguardian lsb:dansguardian \
>>>>        op monitor interval="5s"
>>>> primitive proxy_pingd ocf:pacemaker:pingd \
>>>>        params host_list="1.2.3.4" multiplier="1000" dampen="5s" \
>>>>        op monitor interval="15s" timeout="5s"
>>>> primitive proxy_vip ocf:heartbeat:IPaddr \
>>>>        params ip="1.2.3.5" \
>>>>        op monitor interval="5s" \
>>>>        meta resource_stickiness="500"
>>>> primitive squid lsb:squid \
>>>>        op monitor interval="5s" \
>>>>        op stop interval="0" timeout="180s"
>>>> group proxy_group squid dansguardian
>>>> clone proxy_group_clone proxy_group \
>>>>        meta globally-unique="false"
>>>> clone proxy_pingd_clone proxy_pingd \
>>>>        meta globally-unique="false"
>>>> location proxy_location proxy_vip \
>>>>        rule $id="proxy_location-rule" -inf: proxy_group_clone lt 0
>>>>
>>>> ptest -L -s shows score 0 for proxy_group_clone when a node is healthy,
>>>> and -1000000 when one a member of proxy_group has failed.
>>>>
>>>> I may be going about this wrongly... however I don't wish to add the IP
>>>> to the group, as one of the group members (squid) takes a long time to
>>>> stop, and I don't want the IP to be stuck on a non-functioning node
>>>> during this time.
>>>>
>>>> Currently using Pacemaker 1.0.4 / Heartbeat 2.99.  Any ideas would be
>>>> appreciated.
>>>>
>>>> Thanks,
>>>> Geoff
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>>
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- --

Geoff Lovett
Sr. Network Engineer

Lightning Source Inc.
1246 Heil Quaker Blvd.
La Vergne, TN 37086
geoff.lovett at lightningsource.com
www.lightningsource.com
Phone: 615-213-4610
Fax: 615-213-4727

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