[Pacemaker] [COLOCATION] constraints
Kashif Jawed Siddiqui
kashifjs at huawei.com
Fri Sep 14 10:26:05 UTC 2012
Hi,
colocation myset-1 inf: app2 app1
The above indicates app1 is the Dominant resource. If app1 is stopped, app2 also stops
The chain is app1 -> app2
Next,
colocation myset inf: app1 app2 app3
the above indiactes app1 is the Dominant resource.
If app1 is stopped, app2 & app3 also stops,
if app2 stops, then only app3 stops
The chain is app1 -> app2 -> app3
The above is equivalent of:
colocation myset-1 inf: app2 app1
colocation myset-2 inf: app3 app2
The question:
Why the ordering of allocating resource cannot follow one format? Why difference of configuration?
Why not implement like below?
colocation myset-1 inf: app1 app2
The chain can be app1 -> app2
colocation myset-1 inf: app1 app2 app3
The chain is app1 -> app2 -> app3
And its equivalent (for easy understanding can be)
colocation myset-1 inf: app1 app2
colocation myset-2 inf: app2 app3
And so on..
Why is the diffrence in configuration for 2 resources only? More than 2 resources follow the same pattern.
Please help explain?
Regards,
Kashif Jawed Siddiqui
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