Forum Discussion
ChrisK
Nimbostratus
NimbostratusiRule Question - persistance
I have a question regarding irules.
First off, is it possible to add persistence to a pool via a Virtual Server iRule?
Also, if so, how would this be accomplished? I’m still new with iRules.
Essentially what I am after is: in the old version 4 BigIPs, you could enable persistence on the pools, but now you can only via the VS (virtual server). We have a VS with an iRule which determines which pool to use, and 1 of the pools we would like to have persistence enabled. Can this be done by editing/enabling persistence for that pool in the iRule?
The type of persistence I would like to add is “Active HTTP Cookie Method: insert”.
If you could point me in the right direction that would be very appreciated.
hoolioCirrostratus
Hi CK,
You're correct in that in 4.x you could specify persistence per pool. Now in 9.x/10.x, persistence is set per VIP. You can use an iRule to make more granular persistence decisions.
Take a look at this post for a close example:
http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&postid=33272&ptarget=33284when HTTP_REQUEST { Check requested path if {[HTTP::path] ends_with ".wav"}{ Use cookie persistence (session - no timeout) for this request persist cookie insert my_persist_cookie 0 } else { Use no persistence for this request persist none } }
Aaron- The_BhattmanAlso check out http://devcentral.f5.com/wiki/default.aspx/iRules/persist.html for information about persist.
Bhattman 
ChrisKhi guys,
i gave it a shot and i get the error message when trying to update the iRule
"01070372:3: Persistence mode (Cookie) called out in rule requires a corresponding persistence profile for virtual server"- hoolioYou'll need to add a blank cookie insert persistence profile to the VIP. The iRule then enables and configures or disables the cookie persistence profile according to your required logic.
Aaron
