Dynamic Pool assignment with APM in 10.2.4

ACCESS_POLICY_AGENT_EVENT is triggered only once.

In version 11, APM variable session.assigned.pool is set to the pool member and read for every connection related to the APM session.

If you want the same behavior in version 10, assign pool name in a custom variable and assign the following irule to the VS:

when HTTP_REQUEST {
    set varpool [ACCESS::session data get session.custom.pool]
    if {$varpool eq ne ""} {
        pool $varpool
    }
 }

Hi Stanislas,

good idea, but I'm getting the following error message when trying to safe the iRule:

[command is not valid in current event context (HTTP_REQUEST)] [ACCESS::session data get session.custom.pool_name]

I also was thinking about global variables or the table command, but is the APM event triggered before the HTTP_REQUEST? I mean what happened when the HTTP_REQUEST is triggered, but the variable is not set? How can I guarantee this?

Thank you!

Ciao Stefan 🙂

I added a test to check if session cookie exist. In version 11, "ACCESS::session data get" is valid in HTTP_REQUEST event. try with session variable between quotes:

when HTTP_REQUEST {
    if {[HTTP::cookie exists MRHSession]}{
        set varpool [ACCESS::session data get "session.custom.pool_name"]
        if {$varpool eq ne ""} {
            pool $varpool
        }
    }
 }

Still the same error message:

[command is not valid in current event context (HTTP_REQUEST)] [ACCESS::session data get "session.custom.pool_name"]

Seems to be not possible with v10 that way 😞 I will try it with the session or table command.

Ciao Stefan 🙂

you can try the first irule in the Event ACCESS_ACL_ALLOWED

 

Assign a ACL allowing traffic to raise this event.