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tm500_165564's avatar
tm500_165564
Icon for Nimbostratus rankNimbostratus
Jun 05, 2015
Solved

Help with URI string-based session persistence

Hi all Warning: Newer to F5 but really enjoying the experience so far. Trying to get my hands dirty with iRules. I've been doing a lot of research on the forums and I haven't come across the "gol...
application delivery
devops
iRules
LTM
  • nitass's avatar
    nitass
    Jun 11, 2015

    If this happens the LB just sends the request to the same node that the TCP session is tied to - but the iRule still logs as seeing the new strID value. I was confused and expected this to create a new persistence record and load balance the request, but something tells me I would need more logic in my iRule to detach the connection and re-load balance it with a new persistence record.

     

    you can use oneconnect profile. it will do that for you.

     

tm500_165564's avatar
tm500_165564
Icon for Nimbostratus rankNimbostratus
Jun 08, 2015

Hi Nitass

Thank you for your input!

I did originally have a similar iRule setup to yours but what does your show persistence persist-records output when you change the string?

Ie. I would go to:

/some_uri?strID=Asb20322232343&strTimeLimitInSecs=180&request=submit

then, I would change the string and I would try going to

/some_uri?strID=Asb20321&strTimeLimitInSecs=180&request=submit

The output below shows that a persist record is formed on the first request, but the second does not show up. I'm not sure why it doesn't create a new persist record that is re-load balanced? Does it matter if the source IP or browser session is the same?

 

tm@(test)(cfg-sync Standalone)(Active)(/TEST)(tmos) show ltm persistence persist-records
Sys::Persistent Connections
universal  Asb20322232343  10.64.114.155:80  10.64.115.151:80  (tmm: 0)

 

I hope I'm explaining that clearly.... I think maybe I'm misunderstanding how universal persistence is supposed to work.

Thank you!