Load balance based on backend connections

Hi Chenna,

 

Have you looked at the following

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/ASP_SessionID_Persistence.html

 

http://devcentral.f5.com/wiki/default.aspx/iRules/Weblogic_JSessionID_Persistence.html

 

 

This might give you better idea at how to write up an irule based on MQ Connection - that is, if it passes that information in a cookie header or hTTP headers.

 

 

CB

 

Hello CB: Thanks for your inputs. My requirement is more on load balancing than persistence. I am trying to figure out how I can use that MQ count as a mechanism to load balance. I am able to achieve persistence without any issues, its just that I am not able to tap into that specific monitor.

 

 

In other works, I need some thing like this, if at all possible.

 

 

When HTTP_REQUEST {

 

do a GET to /availableconn.asp on all nodes and save counts in an array

 

LB::node with least connections

 

}

 

 

I am able to create the array just fine but I am not able to do the GET and store it.

 

 

Could you poll the servers with SNMP to get the count of available MQ connections? If so, you could use the SNMP DCA Base monitor and agent to collect the metrics and increase the ratio for servers which have more available MQ connections.

 

 

It might be possible to do something similar with WMI. But I'm not sure whether you could get the MQ connection count using WMI.

 

 

Another option would be using an iControl app (possibly running on LTM itself) which polls the /availableconn.asp page and marks the pool members up or disabled (Only persistent or active connections allowed) if the available connection count is too low.

 

 

You could potentially try to check the /availableconn.asp page using HTTP::retry as described in this article from Deb (Click here), but I think that would be expensive in latency to try to do on every request.

 

 

Aaron

Thanks Aaron. I will some more research into the iRule from Deb's article. I think I got some leads that I can work off of. I'll post my results as soon as I test them. Appreciate your time.