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isspwk_39034's avatar
isspwk_39034
Icon for Nimbostratus rankNimbostratus
Aug 12, 2009

http_request and lb-selected event

I was experimenting F5 LTM using http_request and lb_selected events.

 

I noticed that lb_selected event may not occur for each http_request event.

 

Can you clarify what lb_selected event does?

 

Thanks.
application delivery
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devops
iRules

5 Replies

  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Aug 12, 2009
    Hi,

     

     

    LB_SELECTED (Click here) is triggered whenever a load balancing decision has been made. What are you testing with your iRule? Can you provide a sample of what you're testing and debug logs showing what you're seeing that you're not expecting?

     

     

    Aaron
  • L4L7_53191's avatar
    L4L7_53191
    Icon for Nimbostratus rankNimbostratus
    Aug 12, 2009
    You should be able to fire LB_SELECTED each time an HTTP request comes in. This rule: 

     
  
 when HTTP_REQUEST { 
  
 log local0. "caught http request!" 
  
 } 
  
 when LB_SELECTED { 
  
 log local0. "caught LB_SELECTED!" 
  
 }

    Produces:

    Jul 28 02:12:17 local/tmm info tmm[2160]: Rule event-test : caught http request!

    Jul 28 02:12:17 local/tmm info tmm[2160]: Rule event-test : caught LB_SELECTED!

    Jul 28 02:12:18 local/tmm info tmm[2160]: Rule event-test : caught http request!

    Jul 28 02:12:18 local/tmm info tmm[2160]: Rule event-test : caught LB_SELECTED!

    Jul 28 02:12:18 local/tmm info tmm[2160]: Rule event-test : caught http request!

    For each request. I had an old setup and browser session established that caused me some confusing results initially, so chances are good you've got something similar going on.

    -Matt
  • isspwk_39034's avatar
    isspwk_39034
    Icon for Nimbostratus rankNimbostratus
    Aug 13, 2009
    Hi Aaron,

     

    Thanks for helping.

     

    I was verifying on the default cookie persistence profile of my virtual server.

     

    I have a virtual server with 2 members in the pool.

     

    I attached a irule with the virtual server.

     

    My irule is as follows:

     

     

    when HTTP_REQUEST {

     

    if { [HTTP::cookie exists "USER_ID"] } then {

     

    if { [HTTP::cookie exists "BIGipServerMy_Pool"] } then {

     

    log local0. "[IP::client_addr] \t Not Yet Available \t [HTTP::cookie "USER_ID"] \t [HTTP::cookie "BIGipServerMy_Pool"] \t [HTTP::uri]"

     

    } else {

     

    log local0. "[IP::client_addr] \t Not Yet Available \t [HTTP::cookie "USER_ID"] \t\t [HTTP::uri]"

     

    }

     

    } else {

     

    log local0. "[IP::client_addr] \t Not Yet Available \t\t\t [HTTP::uri]"

     

    }

     

    }

     

    when LB_SELECTED {

     

    if { [HTTP::cookie exists "USER_ID"] } then {

     

    if { [HTTP::cookie exists "BIGipServerMy_Pool"] } then {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t [HTTP::cookie "USER_ID"] \t [HTTP::cookie "BIGipServerMy_Pool"] \t [HTTP::uri]"

     

    } else {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t [HTTP::cookie "USER_ID"] \t\t [HTTP::uri]"

     

    }

     

    } else {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t\t\t [HTTP::uri]"

     

    }

     

    }

     

    when LB_FAILED {

     

    if { [HTTP::cookie exists "USER_ID"] } then {

     

    if { [HTTP::cookie exists "BIGipServerMy_Pool"] } then {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t [HTTP::cookie "USER_ID"] \t [HTTP::cookie "BIGipServerMy_Pool"] \t [HTTP::uri]"

     

    } else {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t [HTTP::cookie "USER_ID"] \t\t [HTTP::uri]"

     

    }

     

    } else {

     

    log local0. "[IP::client_addr] \t [LB::server addr] \t\t\t [HTTP::uri]"

     

     

    ----

     

    And my log is as follows:

     

     

    Aug 12 20:08:24 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/index.cfm

     

    Aug 12 20:08:24 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/index.cfm

     

    Aug 12 20:08:24 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/login.cfm?user_id=test0001&password=password

     

    Aug 12 20:08:24 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/login.cfm?user_id=test0001&password=password

     

    Aug 12 20:08:25 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/index.cfm

     

    Aug 12 20:08:25 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.yyy /cfm/index.cfm

     

    Aug 12 20:08:25 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/login.cfm?user_id=test0002&password=password

     

    Aug 12 20:08:25 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.yyy /cfm/login.cfm?user_id=test0002&password=password

     

    Aug 12 20:08:26 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/index.cfm

     

    Aug 12 20:08:26 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/index.cfm

     

    Aug 12 20:08:26 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/login.cfm?user_id=test0003&password=password

     

    Aug 12 20:08:26 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/login.cfm?user_id=test0003&password=password

     

    Aug 12 20:08:27 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/index.cfm

     

    Aug 12 20:08:27 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.yyy /cfm/index.cfm

     

    Aug 12 20:08:27 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/login.cfm?user_id=test0004&password=password

     

    Aug 12 20:08:27 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.yyy /cfm/login.cfm?user_id=test0004&password=password

     

    Aug 12 20:08:28 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/index.cfm

     

    Aug 12 20:08:28 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/index.cfm

     

    Aug 12 20:08:28 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available /cfm/login.cfm?user_id=test0005&password=password

     

    Aug 12 20:08:28 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx /cfm/login.cfm?user_id=test0005&password=password

     

    Aug 12 20:08:29 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0001 xxxxxxxxxxxx.20480.0000 /1.htm

     

    Aug 12 20:08:29 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx test0001 xxxxxxxxxxxx.20480.0000 /1.htm

     

    Aug 12 20:08:30 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0002 yyyyyyyyyyyy.20480.0000 /2.htm

     

    Aug 12 20:08:30 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0002 yyyyyyyyyyyy.20480.0000 /login_popup.cfm?path=/2.htm

     

    Aug 12 20:08:31 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0003 xxxxxxxxxxxx.20480.0000 /3.htm

     

    Aug 12 20:08:31 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx test0003 xxxxxxxxxxxx.20480.0000 /3.htm

     

    Aug 12 20:08:32 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0004 yyyyyyyyyyyy.20480.0000 /4.htm

     

    Aug 12 20:08:32 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0004 yyyyyyyyyyyy.20480.0000 /login_popup.cfm?path=/4.htm

     

    Aug 12 20:08:33 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0005 xxxxxxxxxxxx.20480.0000 /5.htm

     

    Aug 12 20:08:33 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx test0005 xxxxxxxxxxxx.20480.0000 /5.htm

     

    Aug 12 20:08:34 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0001 xxxxxxxxxxxx.20480.0000 /6.htm

     

    Aug 12 20:08:35 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0002 yyyyyyyyyyyy.20480.0000 /7.htm

     

    Aug 12 20:08:35 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0002 yyyyyyyyyyyy.20480.0000 /login_popup.cfm?path=/7.htm

     

    Aug 12 20:08:36 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0003 xxxxxxxxxxxx.20480.0000 /8.htm

     

    Aug 12 20:08:36 tmm tmm[1807]: Rule TestRule : 10.10.13.13 137.132.xxx.xxx test0003 xxxxxxxxxxxx.20480.0000 /8.htm

     

    Aug 12 20:08:37 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0004 yyyyyyyyyyyy.20480.0000 /9.htm

     

    Aug 12 20:08:37 tmm tmm[1807]: Rule TestRule : 10.10.13.13 Not Yet Available test0004 yyyyyyyyyyyy.20480.0000 /login_popup.cfm?path=/9.htm

     

     

    Does it mean that when LB is selected in the first request, the next request by the same client will not require LB_SELECTED event?

     

    Thanks.

     

     

    wk
  • isspwk_39034's avatar
    isspwk_39034
    Icon for Nimbostratus rankNimbostratus
    Aug 13, 2009
    Hi Matt,

     

     

    Can you elaborate on the old setup and browser session established which resulted in some confusing result?

     

    How did you detect or prevent such setup?

     

    Thanks.

     

     

    wk
  • quantiti_170569's avatar
    quantiti_170569
    Icon for Nimbostratus rankNimbostratus
    Nov 11, 2015

    I got same problem. LB_SELECTED event not fired everytime, so made wrong flow in my persistence uie irule, don't know how to force it fire everytime