Forum Discussion

NiHo_202842's avatar
NiHo_202842
Icon for Cirrostratus rankCirrostratus
Jan 13, 2016

Incorrect load balancing when disabling Oneconnect

Hello,   so sketch the situation; we have a $app-pool and an $app-report-pool. $app-pool serves the regular web interface, while $app-report generates reports and sends this to the user. Default p...
cookie persistence
devops
iRules
LTM
oneconnect
  • Hannes_Rapp_162's avatar
    Hannes_Rapp_162
    Jan 13, 2016

    Is the app-pool configured as Default Pool in your Virtual Server settings? If you conditionally select another pool, ie. the server-report1 pool in an iRule, you will need to include a 'Default or Else' clause in the iRule to 'Re-Confirm' your Default Pool. Just having the app-pool as your Default Pool setting in Virtual Server properties will not be enough.

    You may see a similar problem occuring in your environment:

    - Your first request to app-pool is routed correctly
- Your second request to app-pool is routed correctly
- .. All requests destined to app-pool are routed correctly, until the first occurence where a request is routed to server-report1 pool
- .. All the requests that should go to app-pool (default) thereafter are now incorrectly routed to server-report1 pool.

    For a solution, if you're using the 

    if
    conditional statement, append an 
    else
    statement to specify the app-pool as your default selection in iRule. If you're using 
    switch
    conditional statement, append a 
    default
    statement.

    Give it a try, if the conditions described match your configuration. This would be a generic iRule problem, not related to OneConnect by any means.

Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Jan 13, 2016

Hi,

In irule changing the pool based on URI, don't forget to change back to default pool URI which does not match specific URI.

Pool decision is done for the entire tcp connection when one connect is not enabled. 

when CLIENT_ACCEPTED {
  set default_pool [LB::server pool]
}

when HTTP_REQUEST {
    if {[HTTP::uri] starts_with "/reports"} { 
        pool report
    } else {
        pool $default_pool
    }
}