[ClusterLabs] can't start/stop a drbd resource with pacemaker

Lentes, Bernd bernd.lentes at helmholtz-muenchen.de
Fri Jul 15 20:08:08 EDT 2016



----- Am 15. Jul 2016 um 23:48 schrieb Ken Gaillot kgaillot at redhat.com:

> On 07/15/2016 03:54 PM, Lentes, Bernd wrote:
>> 
>> 
>> ----- Am 13. Jul 2016 um 14:25 schrieb Kristoffer Grönlund kgronlund at suse.com:
>> 



>>>
>> 
>> Hi,
>> 
>> i found that:
>> 
>> crm(live)resource# scores
>> 
>> Current cluster status:
>> Online: [ sunhb58820 sunhb65277 ]
>> 
>>  prim_ip_hawk   (ocf::heartbeat:IPaddr):        (target-role:Stopped) Stopped
>>  prim_fs_drbd_r0        (ocf::heartbeat:Filesystem):    (target-role:Stopped)
>>  Stopped
>>  prim_hawk      (lsb:hawk):     Stopped
>>  Master/Slave Set: ms_drbd_r0 [prim_drbd_r0]
>>      Stopped: [ sunhb58820 sunhb65277 ]
>> 
>> Allocation scores:
>> native_color: prim_ip_hawk allocation score on sunhb58820: -INFINITY
>> native_color: prim_ip_hawk allocation score on sunhb65277: -INFINITY
>> native_color: prim_fs_drbd_r0 allocation score on sunhb58820: -INFINITY
>> native_color: prim_fs_drbd_r0 allocation score on sunhb65277: -INFINITY
>> native_color: prim_hawk allocation score on sunhb58820: -INFINITY
>> native_color: prim_hawk allocation score on sunhb65277: -INFINITY
>> clone_color: ms_drbd_r0 allocation score on sunhb58820: 0
>> clone_color: ms_drbd_r0 allocation score on sunhb65277: 0
>> clone_color: prim_drbd_r0:0 allocation score on sunhb58820: 0
>> clone_color: prim_drbd_r0:0 allocation score on sunhb65277: 0
>> clone_color: prim_drbd_r0:1 allocation score on sunhb58820: 0
>> clone_color: prim_drbd_r0:1 allocation score on sunhb65277: 0
>> native_color: prim_drbd_r0:0 allocation score on sunhb58820: -INFINITY
>> native_color: prim_drbd_r0:0 allocation score on sunhb65277: -INFINITY
>> native_color: prim_drbd_r0:1 allocation score on sunhb58820: -INFINITY
>> native_color: prim_drbd_r0:1 allocation score on sunhb65277: -INFINITY
>> prim_drbd_r0:0 promotion score on none: 0
>> prim_drbd_r0:1 promotion score on none: 0
>> 
>> When the score is -INFINITY, the resource can't run on both nodes. Yes ?
> 
> Correct, a score of -INFINITY for a particular resource on a particular
> node means that resource can't run there. In this case, the
> "target-role:Stopped" explains it -- you've explicitly disabled
> prim_ip_hawk and prim_fs_drbd_r0 in the configuration, and the cluster
> implements that by setting -INFINITY scores on all nodes.
> 
>> What means native_color and clone_color ? I read something about different
>> functions in the allocation ?
> 
> Right, it's just an internal detail indicating where the score was
> calculated. The important information is the resource name, node name,
> and score.
> 
>> Why are the values different ? Is the score changing depending on the time ?
> 
> No, it just means different functions contribute to the score. For
> clones, both the clone as a whole and the individual clone instances
> have scores. Scores are added together to get a final value.
> 
>> And why is there a prim_drbd_r0:0 and a prim_drbd_r0:1 ?
> 
> Those are the individual clone instances. It's possible for individual
> clone instances to have different scores. For example, you might have a
> constraint saying that the master role prefers a certain node.
> 

Is there a way to manipulate the scores ? Is the score -INFINITY because the resource is stopped
or is the resource stopped because the score is -INFINITY ?
E.g. if i stop a resource with crm resource start xxx does this set the INFINITY to minus ?
And what happens if i want to start a resource ? Does it set the score to a "normal" value and
start it afterwars or
does the cluster refuse to start it because of -INFINITY ?

I read two books about clusters before beginning to play with it.
But i still underrated the complexity. And the amount of tools does not simplify it.
But it's interesting and exciting.


Bernd
 

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