[Pacemaker] cloned IPaddr2 on 4 nodes

[Michael Schwartzkopff]

On Thursday 28 October 2010 16:00:39 Vladimir Legeza wrote:
> *Hello folks.
> 
> I try to setup four ip balanced nodes but,  I didn't found the right way to
> balance load between nodes when some of them are filed.
> 
> I've done:*
> 
> [root at node1 ~]# crm configure show
> node node1
> node node2
> node node3
> node node4
> primitive ClusterIP ocf:heartbeat:IPaddr2 \
>     params ip="10.138.10.252" cidr_netmask="32"
> clusterip_hash="sourceip-sourceport" \
>     op monitor interval="30s"
> clone StreamIP ClusterIP \
>     meta globally-unique="true" *clone-max="8"
> clone-node-max="2"*target-role="Started" notify="true" ordered="true"
> interleave="true"

Why do you have and interleave? interleave make only sense if this resource 
depens on a other clone.

I am not quite sure about ordered, but I this it is not necessary and only 
costs time starting up. You could check without this option.

> property $id="cib-bootstrap-options" \
>     dc-version="1.0.9-0a40fd0cb9f2fcedef9d1967115c912314c57438" \
>     cluster-infrastructure="openais" \
>     expected-quorum-votes="4" \
>     no-quorum-policy="ignore" \
>     stonith-enabled="false"
> 
> *When all the nodes are up and running:*
> 
>  [root at node1 ~]# crm status
> ============
> Last updated: Thu Oct 28 17:26:13 2010
> Stack: openais
> Current DC: node2 - partition with quorum
> Version: 1.0.9-0a40fd0cb9f2fcedef9d1967115c912314c57438
> 4 Nodes configured, 4 expected votes
> 2 Resources configured.
> ============
> 
> Online: [ node1 node2 node3 node4 ]
> 
>  Clone Set: StreamIP (unique)
>      ClusterIP:0    (ocf::heartbeat:IPaddr2):    Started node1
>      ClusterIP:1    (ocf::heartbeat:IPaddr2):    Started node1
>      ClusterIP:2    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:3    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:4    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:5    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:6    (ocf::heartbeat:IPaddr2):    Started node4
>      ClusterIP:7    (ocf::heartbeat:IPaddr2):    Started node4
> *
> Everything is OK and each node takes 1/4 of all traffic - wonderfull.
> But we become to 25% traffic loss if one of them goes down:
> *
> [root at node1 ~]# crm node standby node1
> [root at node1 ~]# crm status
> ============
> Last updated: Thu Oct 28 17:30:01 2010
> Stack: openais
> Current DC: node2 - partition with quorum
> Version: 1.0.9-0a40fd0cb9f2fcedef9d1967115c912314c57438
> 4 Nodes configured, 4 expected votes
> 2 Resources configured.
> ============
> 
> Node node1: standby
> Online: [ node2 node3 node4 ]
> 
>  Clone Set: StreamIP (unique)
> *     ClusterIP:0    (ocf::heartbeat:IPaddr2):    Stopped
>      ClusterIP:1    (ocf::heartbeat:IPaddr2):    Stopped *
>      ClusterIP:2    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:3    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:4    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:5    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:6    (ocf::heartbeat:IPaddr2):    Started node4
>      ClusterIP:7    (ocf::heartbeat:IPaddr2):    Started node4
> 
> *I found the solution (to prevent loosing) by set clone-node-max to 3*
> 
> [root at node1 ~]# crm resource meta StreamIP set clone-node-max 3
> [root at node1 ~]# crm status

Very reasonable.

> ============
> Last updated: Thu Oct 28 17:35:05 2010
> Stack: openais
> Current DC: node2 - partition with quorum
> Version: 1.0.9-0a40fd0cb9f2fcedef9d1967115c912314c57438
> 4 Nodes configured, 4 expected votes
> 2 Resources configured.
> ============
> 
> *Node node1: standby*
> Online: [ node2 node3 node4 ]
> 
>  Clone Set: StreamIP (unique)
> *     ClusterIP:0    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:1    (ocf::heartbeat:IPaddr2):    Started node3*
>      ClusterIP:2    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:3    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:4    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:5    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:6    (ocf::heartbeat:IPaddr2):    Started node4
>      ClusterIP:7    (ocf::heartbeat:IPaddr2):    Started node4
> 
> *The problem is that nothing gonna changed when node1 back online.*
> 
> [root at node1 ~]# crm node online node1
> [root at node1 ~]# crm status
> ============
> Last updated: Thu Oct 28 17:37:43 2010
> Stack: openais
> Current DC: node2 - partition with quorum
> Version: 1.0.9-0a40fd0cb9f2fcedef9d1967115c912314c57438
> 4 Nodes configured, 4 expected votes
> 2 Resources configured.
> ============
> 
> Online: [ *node1* node2 node3 node4 ]
> 
>  Clone Set: StreamIP (unique)
> *     ClusterIP:0    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:1    (ocf::heartbeat:IPaddr2):    Started node3*
>      ClusterIP:2    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:3    (ocf::heartbeat:IPaddr2):    Started node2
>      ClusterIP:4    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:5    (ocf::heartbeat:IPaddr2):    Started node3
>      ClusterIP:6    (ocf::heartbeat:IPaddr2):    Started node4
>      ClusterIP:7    (ocf::heartbeat:IPaddr2):    Started node4
> *
> There are NO TRAFFIC on node1.
> If I back clone-node-max to 2  - all nodes revert to the original state.*

I have seen this behavior. The cloned resources should spread out even on all 
nodes, but don't seem to do so. Perhaps This is solved in a later version. 

@Beekhof: Is it?


> So, My question is How to avoid such "hand-made" changes ( or is it
> possible to automate* clone-node-max* adjustments)?

It seems the resource-stickiness="0" doesn't help here.

So I'd try scripting.

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
Fax: (089) 620 304 13

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
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