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Ashish1982k_242's avatar
Ashish1982k_242
Icon for Altostratus rankAltostratus
May 31, 2018

iRule for cookie based load balancing

I am trying to create an iRule to load balance on cookie data. cookie Name- gcbSessionServer

 

I am using below code but it is giving error

 

May 31 11:10:20 ttncltmxza-p err tmm[17866]: 01220001:3: TCL error: /Common/cct-cobrowse-ct-test_pool_switch_rule - expected boolean value but got "" while executing "if { [HTTP::cookie exist "gcbSessionServer"] } { switch -glob ([HTTP::cookie value "gcbSessionServer"]) { ".Co-browse_TENCBSD0_Node1" { pool cct..."

 

when HTTP_REQUEST { if { [HTTP::cookie exist "gcbSessionServer"] } { switch -glob ([HTTP::cookie value "gcbSessionServer"]) { ".Co-browse_TENCBSD0_Node1" { pool cct-cobrowse-ct-node-1_pool } ".Co-browse_TENCBSD0_Node2" { pool cct-cobrowse-ct-node-2_pool } ".Co-browse_TENCBSD0_Node3" { pool cct-cobrowse-ct-node-3_pool } } } else { pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool log local0. " Selected pool [LB::select] " } }

 

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iRules
  • Ashish1982k_242's avatar
    Ashish1982k_242
    Jun 02, 2018

    I am using below iRule and it works. I have single servers in pool and if the server is down LTM was throwing error.

     

    when HTTP_REQUEST {

     

    if { ([HTTP::cookie exists gcbSessionServer]) } {

     

    if { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD0_Node1") and ([active_members cct-cobrowse-ct-node-1_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-1_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    elseif { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD1_Node2") and ([active_members cct-cobrowse-ct-node-2_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-2_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    elseif { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD2_Node3") and ([active_members cct-cobrowse-ct-node-3_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-3_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    else {

     

    LB::mode rr

     

    pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool

     

    log local0. " COOKIE FOUND Selected pool [LB::select] "

     

    } }

     

    else {

     

    LB::mode rr

     

    pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool

     

    log local0. " NO COOKIE Selected pool [LB::select] "

     

    } }

     

4 Replies

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  • Ashish1982k_242's avatar
    Ashish1982k_242
    Icon for Altostratus rankAltostratus
    May 31, 2018

    Better view of iRule:

    when HTTP_REQUEST {

    if { [HTTP::cookie exists gcbSessionServer] } {

    switch [HTTP::cookie value "gcbSessionServer"] {

    ".Co-browse_TENCBSD0_Node1" {
    pool cct-cobrowse-ct-node-1_pool 
}
".Co-browse_TENCBSD0_Node2" { 
    pool cct-cobrowse-ct-node-2_pool 
}
".Co-browse_TENCBSD0_Node3" { 
    pool cct-cobrowse-ct-node-3_pool 
}

    } }

    else {

        pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool
    log local0. " Selected pool [LB::select] "

    }

    }

  • Vijay_E's avatar
    Vijay_E
    Icon for Cirrus rankCirrus
    Jun 01, 2018

    Can you try to log the cookie value using local0 ? It may help to understand what the F5 is actually seeing in the iRule and will help you to rewrite iRule if required.

     

  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    Jun 01, 2018

    Hi,

    I don't think you need to check if the cookie exists first, as HTTP::cookie value will return a null length string even if the cookie name doesn't exist.

    Your problem is that "[HTTP::cookie exist "gcbSessionServer"]" have to return 0 or 1 but it seems that in your irule is empty.

    so try this, we can try another thing if it's not working

    when HTTP_REQUEST { 

switch -glob ([HTTP::cookie value "gcbSessionServer"]) {
    ".Co-browse_TENCBSD0_Node1" { pool cct-cobrowse-ct-node-1_pool } 
    ".Co-browse_TENCBSD0_Node2" { pool cct-cobrowse-ct-node-2_pool } 
    ".Co-browse_TENCBSD0_Node3" { pool cct-cobrowse-ct-node-3_pool } 
    default {
    pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool 
    log local0. " Selected pool [LB::select] "
    }
}

}

    keep me in touch.

    Regards

  • Ashish1982k_242's avatar
    Ashish1982k_242
    Icon for Altostratus rankAltostratus
    Jun 02, 2018

    I am using below iRule and it works. I have single servers in pool and if the server is down LTM was throwing error.

     

    when HTTP_REQUEST {

     

    if { ([HTTP::cookie exists gcbSessionServer]) } {

     

    if { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD0_Node1") and ([active_members cct-cobrowse-ct-node-1_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-1_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    elseif { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD1_Node2") and ([active_members cct-cobrowse-ct-node-2_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-2_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    elseif { ([HTTP::cookie value "gcbSessionServer"] contains ".Co-browse_TENCBSD2_Node3") and ([active_members cct-cobrowse-ct-node-3_pool] > 0)} {

     

    pool cct-cobrowse-ct-node-3_pool

     

    log local0. " COOKIE->[HTTP::cookie value "gcbSessionServer"] Selected pool [LB::select] " }

     

    else {

     

    LB::mode rr

     

    pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool

     

    log local0. " COOKIE FOUND Selected pool [LB::select] "

     

    } }

     

    else {

     

    LB::mode rr

     

    pool /Common/cct-cobrowse-ct.app/cct-cobrowse-ct_pool

     

    log local0. " NO COOKIE Selected pool [LB::select] "

     

    } }