[Pacemaker] advisory colocation constraint group->service

Andreas Kurz andreas.kurz at linbit.com
Wed Oct 29 13:12:07 UTC 2008 

On Wednesday 29 October 2008 11:28:30 Andrew Beekhof wrote:
> On Fri, Oct 24, 2008 at 21:33, Andrew Beekhof <beekhof at gmail.com> wrote:
> > Sorry for the delay...
> > This might be a bug, but I see:
> >
> > info: native_merge_weights: service_bgp-upc: Breaking dependancy loop
> >
> > in the logs, which makes me suspicious about the colocation
> > constraints (since this shouldn't really happen)
>
> ok, i was correct up to here.
>
> I'm pretty sure you want:

hmm .... not really. 

>
> --- cib_group-res-constr.orig.xml	2008-10-29 11:09:47.000000000 +0100
> +++ cib_group-res-constr.xml	2008-10-29 11:26:13.000000000 +0100
> @@ -265,7 +265,7 @@
>         <rsc_colocation id="bgp-upc-colocate-with-ip_upc"
> from="service_bgp-upc" to="service_ip_upc" score="INFINITY"/>
>         <rsc_order id="bgp-telekom-after-ip_telekom"
> from="service_bgp-telekom" type="after" to="service_ip_telekom"
> score="0"/>
>         <rsc_colocation id="bgp-telekom-colocated-with-ip_telekom"
> from="service_bgp-telekom" to="service_ip_telekom" score="INFINITY"/>
> -       <rsc_colocation id="bgp-upc-colocated-with-bgp_telekom"
> from="service_bgp-upc" to="service_bgp-telekom" score="1"
> symmetrical="true"/>
    ^^^^^^^^^^^

My intention for this (^) was to loosely couple them together so they run 
together on the same host. If I decide to stop one of them  and restart it 
after a while it should be colocated again with its "partner" ... if i decide 
to migrate only one of the  two resources to another node the other resource 
should stay where it is running.


> +       <rsc_colocation id="bgp-upc-colocated-with-bgp_telekom"
> from="service_bgp-upc" to="service_bgp-telekom" score="1"/>
>         <rsc_order id="ospf-dmz-after-ips" from="service_ospf-dmz"
> type="after" to="group_routing_ips" score="0"/>
>         <rsc_colocation id="ospf-dmz-colocate-with-ips"
> from="service_ospf-dmz" to="group_routing_ips" score="INFINITY"/>
>         <rsc_order id="ospf-default-after-ips"
> from="service_ospf-default" type="after" to="group_routing_ips"
> score="0"/>
> @@ -275,8 +275,8 @@
>         <rsc_colocation id="ipsec-IP-colocate-with-ips"
> from="service_ip_IPSEC" to="group_routing_ips" score="1"/>
>         <rsc_colocation id="mysql-colocate-with-ips" from="mysql"
> to="group_routing_ips" score="1"/>
>         <!-- hmm ... the next two constraints work not as expected -->
> -       	  <rsc_colocation id="ips-colocate-with-bgp_telekom"
> from="group_routing_ips" to="service_bgp-telekom" score="1"/>
> -          <rsc_colocation id="ips-colocate-with-bgp_upc"
> from="group_routing_ips" to="service_bgp-upc" score="1"/>

no, no ... that's fine ;-) start the group of "other ips" where the bgp 
services are running 

Please correct me if I'am wrong but for me it looks like the score of the 
colocation is ignored and always INFINITY. I expected the advisory colocation 
constraint to not stop an already runing resource to fullfill the 
constraint ... is this a misinterpretion?

Regards,
Andreas

> +       	  <rsc_colocation id="ips-colocate-with-bgp_telekom"
> to="group_routing_ips" from="service_bgp-telekom" score="1"/>
> +          <rsc_colocation id="ips-colocate-with-bgp_upc"
> to="group_routing_ips" from="service_bgp-upc" score="1"/>
>         <!-- #################################################### -->
>         <rsc_order id="stop-bgp-ta-only-after-bgp-upc-start"
> from="service_bgp-telekom" action="stop" type="after"
> to="service_bgp-upc" to_action="start" symmetrical="false" score="0"/>
>     </constraints>
>
> > On Wed, Oct 15, 2008 at 18:28, Andreas Kurz <andreas.kurz at linbit.com> 
wrote:
> >> On Wednesday 15 October 2008 11:52:49 Andrew Beekhof wrote:
> >>> On Oct 13, 2008, at 5:31 PM, Andreas Kurz wrote:
> >>> > Hi,
> >>> >
> >>> > I have another constraints problem with a Heartbeat 2.1.3
> >>> > installation and I
> >>> > wonder where's my error in the configuration.
> >>> >
> >>> > I want to make an advisory colocation of a group of six IPs with a
> >>> > service but
> >>> > when I stop (target_role=stopped) the service, the group is also
> >>> > stopped:
> >>> >
> >>> > * default-resource-stickiness 10
> >>> > * all services are started on the same node
> >>> > * no location constraints
> >>> >
> >>> > <rsc_colocation id="ips-colocate-with-srvA"
> >>> >   from="group_ips" to="srvA"
> >>> >   score="1"/>
> >>> >
> >>> > Is an advisory colocation constraint between a group and a service
> >>> > not supported?
> >>>
> >>> It should work.
> >>> Can you send me the "cibadmin -Q" output just before you set
> >>> target_role=stopped please?
> >>
> >> I attached the cib ..... when I stop e.g the resource "service_ip_upc"
> >> all services that are advisory colocated to this service are also
> >> stopped additionally also the following colocation constraint is not
> >> working:
> >>
> >> <rsc_colocation id="bgp-upc-colocated-with-bgp_telekom"
> >>        from="service_bgp-upc"
> >>        to="service_bgp-telekom"
> >>   score="1" symmetrical="true"/>
> >>
> >> If I remove these two colocation constraints
> >> named "ips-colocate-with-bgp_telekom"  and "ips-colocate-with-bgp_upc"
> >> the constraint above works again.
> >>
> >> Thx&Regards,
> >> Andreas
> >>
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> >>
> >> --
> >>
> >> : Andreas Kurz
> >> : LINBIT | Your Way to High Availability
> >> : Tel +43-1-8178292-64, Fax +43-1-8178292-82
> >> :
> >> : http://www.linbit.com
> >>
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