Forum Discussion

Frank_ten_Wolde's avatar
Frank_ten_Wolde
Icon for Nimbostratus rankNimbostratus
Dec 20, 2023

[LB::server pool] evaluation changes between HTTP_REQUEST and HTTP_REQUEST_SEND

Consider a virtual server with two pools, one for virtual host A and one for virtual host B: https://A.example.com/ --> pool_A https://B.example.com/ --> pool_B We are using a Local Traffic Pol...
application delivery
HTTP2 LB::server pool selection
Frank_ten_Wolde's avatar
Frank_ten_Wolde
Icon for Nimbostratus rankNimbostratus
Dec 21, 2023

No, we're not using persistence, nor cookies. And we are using LTPs to do the pool selection.

Also, I wouldn't expect the "LB::server pool" to change between the HTTP_REQUEST and LB_SELECTED/HTTP_REQUEST_SEND events...

 

  • zamroni777's avatar
    zamroni777
    Icon for Cumulonimbus rankCumulonimbus
    Dec 22, 2023

    I test using below irules and found that LB_SELECTED happens before HTTP_REQUEST.
    so it seems that's why in HTTP_REQUEST you still get pool_A when traffic policy config should select pool_B.

     

    when LB_SELECTED {
log local0. "CCCCCCCCC"
}

when  HTTP_REQUEST  {
log local0. "BBBBBBBBBBBBB"
}

when  HTTP_REQUEST_SEND  {
log local0. "AAAAAAAAAAAAAAA"
}