Forum Discussion

DarioGB_339840's avatar
DarioGB_339840
Icon for Altostratus rankAltostratus
Nov 07, 2018

Loadbalancing Virtual Server as Nodes

Hello.

 

I'm trying to configure a complex solution of loadbalancing.

 

One part of this solution needs to loadbalance virtual servers which reside in the same F5.

 

VS1 -> Pool1 -> Member1, Member2 VS2 -> Pool2 -> Member3, Member4 VS3 -> Pool3 -> VS1, VS2

 

Using GUI, this is perfectly configurable, but it's not running yet.

 

Do you know if there exist some limitation to perform this kind of scenario?

 

KR, Dario.

 

application delivery
BIG-IP
LTM
  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Nov 07, 2018

    This senerio called as VIP calling VIP. Can you enable snat automap.. Configured this senerio with different lb but ur case on same LB..

     

    Is your individual VIP is responding?

     

  • DarioGB_339840's avatar
    DarioGB_339840
    Icon for Altostratus rankAltostratus
    Nov 07, 2018

    I write again the solution:

    VS1 -> Pool1 -> Member1, Member2
VS2 -> Pool2 -> Member3, Member4
VS3 -> Pool3 -> VS1, VS2
  • Samir_Jha_52506's avatar
    Samir_Jha_52506
    Icon for Noctilucent rankNoctilucent
    Nov 07, 2018

    This senerio called as VIP calling VIP. Can you enable snat automap.. Configured this senerio with different lb but ur case on same LB..

     

    Is your individual VIP is responding?

     

    • DarioGB_339840's avatar
      DarioGB_339840
      Icon for Altostratus rankAltostratus
      Nov 07, 2018

      Hello f5_rock.

      Thanks for your answer!

      As I read here VIP-targeting-VIP is not possible using Loadbalancing resolution (Configuring several Local VS as members of a pool). The only way is to configure an iRule with a command called virtual.

      https://support.f5.com/csp/article/K10379

      I have tried to use this command inside the LB_SELECTED event, but it's not working at all 😞

      when LB_SELECTED {
    virtual mytestingVS
}

      Using this command in a previous event is unuseful for me, because I'm losing the point of LB selection.

      By the way, my final goal is to configure Active-Passive Loadbalancing between two cluster (2 nodes by cluster) with no preempt

      Cluster1 (Node1, Node2) with Round Robin
Cluster2 (node3, Node4) with Round Robin

      Each cluster is loadbalanced using active-passive but I need to avoid peempt (no switch back to active cluster after recovering).

      Any help would be appreciated

      KR, Dario.

    • DarioGB_339840's avatar
      DarioGB_339840
      Icon for Altostratus rankAltostratus
      Nov 08, 2018

      Great!

       

      I have recently detected that the expression "VIP-targeting-VIP is not possible using Loadbalancing resolution" in my last comment is not true 🙂

       

      To do so, it's necessary to use the expression "

      LB::reselect
      " before "
      virtual {VS_name}
      "

       

      when LB_SELECTED {
    if { [LB::server addr] eq '10.1.1.1' } {
        LB::reselect virtual vs-local-traffic-handler
    }
}

      REF - https://clouddocs.f5.com/api/irules/virtual.html

       

      KR, Dario.