[Pacemaker] Location score inf doesn't mean 'must'

[Pawel Warowny]

Hi

Because my cluster behaves strangely (which i described in post 'start
order after manual migration') I created new cluster only for testing.

It consists of two nodes: bolek and lolek

Configuration is very simple:
At first starting 4 clone resources (res1, res2, res3, res4) one
after another. After this starting the last single resource
(i-should-start-last) which can move between nodes.

The first problem: I created location with score INF for resource
i-should-start-last so that resource MUST run on node 'bolek':

location loc_i-should-start-last i-should-start-last inf: bolek

then I forced node bolek into standby:
crm node standby bolek

After this, resource i-should-start-last started on node lolek. Why?

There is in documentation:
Negative values indicate the resource can not run on this node. Values of +/-
INFINITY change "can" to "must".

So if the resource must run on node bolek, why it is running on node
lolek?

Apart of this, why node lolek before starting i-must-start-last
resource stopping and starting all other resources (see logs below).

My configuration:

primitive res1 ocf:pacemaker:Dummy
primitive res2 ocf:pacemaker:Dummy
primitive res3 ocf:pacemaker:Dummy
primitive res4 ocf:pacemaker:Dummy
primitive i-should-start-last ocf:pacemaker:Dummy

clone res1-clone res1
clone res2-clone res2
clone res3-clone res3
clone res4-clone res4

location loc_i-should-start-last i-should-start-last inf: bolek

colocation res1_with_res2 inf: res2-clone res1-clone
colocation res2_with_res3 inf: res3-clone res2-clone
colocation res3_with_res4 inf: res4-clone res3-clone
colocation res4_with_i-should-start-last 1000: i-should-start-last res4-clone

order res1_before_res2 inf: res1-clone res2-clone
order res2_before_res3 inf: res2-clone res3-clone
order res3_before_res4 inf: res3-clone res4-clone
order res4_before_i-should-start-last inf: res4-clone i-should-start-last

After standby node bolek i've got in logs:

Logs from bolek:

Jun 16 13:04:40 bolek lrmd: [1743]: info: rsc:i-should-start-last:337: stop
Jun 16 13:04:40 bolek lrmd: [1743]: info: rsc:res4:1:338: stop
Jun 16 13:04:40 bolek lrmd: [1743]: info: rsc:res3:0:339: stop
Jun 16 13:04:40 bolek lrmd: [1743]: info: rsc:res2:0:340: stop
Jun 16 13:04:40 bolek lrmd: [1743]: info: rsc:res1:0:341: stop

Logs from lolek:

Jun 16 13:04:06 lolek lrmd: [1868]: info: rsc:res4:0:256: stop
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:res3:1:257: stop
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:res2:1:258: stop
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:res2:1:259: start
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:res3:1:260: start
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:res4:0:261: start
Jun 16 13:04:07 lolek lrmd: [1868]: info: rsc:i-should-start-last:262: start

Best regards

-- 
Pawel Warowny
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