20.01.2015 02:47, Andrew Beekhof wrote:
On 17 Jan 2015, at 1:25 am, Vladislav Bogdanov
<bub...@hoster-ok.com> wrote:
Hi all,
Trying to reproduce problem with early stop of globally-unique
clone instances during move to another node I found one more
"interesting" problem.
Due to the different order of resources in the CIB and extensive
use of constraints between other resources (odd number of resources
cluster-wide) two CLUSTERIP instances are always allocated to the
same node in the new testing cluster.
Ah, so this is why broker-vips:1 was moving.
That are two different 2-node clusters with different order of resources.
In the first one broker-vips go after even number of resources, and one
instance wants to return to a "mother-node" after it is brought back
online, thus broker-vips:1 is moving.
In the second one, broker-vips go after odd number of resources
(actually three more resources are allocated to one node due to
constraints) and both boker-vips go to another node.
What would be the best/preferred way to make them run on different
nodes by default?
By default they will. I'm assuming its the constraints that are
preventing this.
I only see that they are allocated similar to any other resources.
Getting them to auto-rebalance is the harder problem
I see. Should it be possible to solve it without priority or utilization
use?
I see following options:
* Raise priority of globally-unique clone so its instances are
>> always allocated first of all.
* Use utilization attributes (with high values for nodes and low values
for cluster resources).
>> * Anything else?
If I configure virtual IPs one-by-one (without clone), I can add a
colocation constraint with negative score between them. I do not
see a way to scale that setup well though (5-10 IPs). So, what
would be the best option to achieve the same with globally-unique
cloned resource? May be there should be some internal
preference/colocation not to place them together (like default
stickiness=1 for clones)? Or even allow special negative colocation
constraint and the same resource in both 'what' and 'with'
(colocation col1 -1: clone clone)?
Best, Vladislav
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