[ClusterLabs] bit of wizardry bit of trickery needed.

[lejeczek]

On 10/05/2021 17:04, Andrei Borzenkov wrote:
> On 10.05.2021 16:48, lejeczek wrote:
>> Hi guys
>>
>> Before I begin my adventure with this I though I would ask experts if
>> something like below is possible.
>>
>> resourceA if started on nodeA, then nodes B & C start resourceB (or
>> recourceC)
>>
> Configure colocation with negative score between resourceB and
> resourceA, so resourceB will be started on different node.
>
>> whether to start resource B or C on two nodes (might thing of it as
>> master node + two slaves) depend on which node resourceA got started.
>>
>> eg.
>> if nodeA runs rMaster -> nodeB, nodeC run rToA
>> if nodeB runs rMaster -> nodeA, nodeC run rToB
>> if nodeC runs rMaster -> nodeA, nodeB run rToC
>>
>> any light shedding or idea sharing are much welcomed.
>> many thanks, L.
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perhaps I did not do best explaining, I'll try again

if nodeA runs rMaster -> nodeB, nodeC run rToA (meaning..
a) no r{ToA,ToB,ToC} allowed on the node if "rMaster" runs on that node, this case nodeA,
b) if it's nodeA cluster chose to run "rMaster" on, then only "rToA" is allowed to run on nodeB & nodeC
c) a&b applies across to nodeB,C respectively

I'm starting with "rMaster" and other three resources as clones but I fail to see how to make it work.