[Pacemaker] Configure simple Network Load-balancing

[David Coulson]

I would add HA to your existing HA config - The primary issue you have 
right now is that if tomcat is down, broken or needs to be disabled you 
don't have a good way of doing that automatically.

My implementations for this type of application are pacemaker + 
ldirectord + LVS. Since you have a 15x increase in number of clients, 
now is a good time to argue the business case for something more robust 
than CLUSTERIP.

David

On 11/30/12 7:30 AM, Ratko Dodevski wrote:
> Probably, but HA is already the solution in place so I have to use-it. 
> Now there are around 200 clients but it will grow up till 3000 in the 
> next two months. Servers have Tomcat installed on them, so basically I 
> need to load balance connections from outside to the Tomcat.
>
> Regards
>
>
> On Fri, Nov 30, 2012 at 1:19 PM, David Coulson <david at davidcoulson.net 
> <mailto:david at davidcoulson.net>> wrote:
>
>     All the connections, from how many clients?
>
>     You might be better off using LVS for this.
>
>     David
>
>
>     On 11/30/12 7:15 AM, Ratko Dodevski wrote:
>>     Hi guys, I need some help on configuring NLB for my application
>>     servers. I've installed tomcat on 4 servers and I've decided to
>>     use Linux HA for Network Load Balancing, but is seems like all
>>     the connections are going only to one of the servers
>>     (app-node-1). Can someone tell me what I'm doing wrong? It's
>>     pretty simple config, just one clone resource (IPaddr2) running
>>     on all nodes. Also, can someone tell me how is NLB done? based on
>>     source IP, IP hash or... I need Round Robbin NLB.
>>
>>     app-node-1:/ # crm configure show
>>     node app-node-1
>>     node app-node-2
>>     node app-node-3 \
>>             attributes standby="on"
>>     node app-node-4
>>     primitive tomcat_ip ocf:heartbeat:IPaddr2 \
>>             params ip="X.X.X.X" cidr_netmask="24" nic="eth0" \
>>             op monitor interval="30s" \
>>             meta target-role="started"
>>     clone nlb_ip tomcat_ip \
>>             meta globally-unique="true" clone-max="4" clone-node-max="1"
>>     property $id="cib-bootstrap-options" \
>>     dc-version="1.1.2-2e096a41a5f9e184a1c1537c82c6da1093698eb5" \
>>             cluster-infrastructure="openais" \
>>             expected-quorum-votes="4" \
>>             stonith-enabled="false" \
>>             no-quorum-policy="ignore" \
>>             last-lrm-refresh="1333954979"
>>     rsc_defaults $id="rsc-options" \
>>             resource-stickiness="100"
>>
>>     ============
>>     Last updated: Fri Nov 23 01:57:49 2012
>>     Stack: openais
>>     Current DC: app-node-1 - partition with quorum
>>     Version: 1.1.2-2e096a41a5f9e184a1c1537c82c6da1093698eb5
>>     4 Nodes configured, 4 expected votes
>>     1 Resources configured.
>>     ============
>>
>>     Online: [ app-node-1 app-node-4 app-node-2 ]
>>     OFFLINE: [ app-node-3 ]
>>
>>      Clone Set: nlb_ip (unique)
>>          tomcat_ip:0  (ocf::heartbeat:IPaddr2):       Started app-node-1
>>          tomcat_ip:1  (ocf::heartbeat:IPaddr2):       Started app-node-2
>>          tomcat_ip:2  (ocf::heartbeat:IPaddr2):       Started app-node-4
>>          tomcat_ip:3  (ocf::heartbeat:IPaddr2):       Stopped
>>
>>
>>     Thanks and regards
>>
>>     -- 
>>     Ratko
>>
>>
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>
>
>
>
> -- 
> Ratko

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