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.
4 Replies
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
