Forum Discussion
isspwk_39034
Nimbostratus
Nimbostratushttp_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.
hoolioCirrostratus
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_53191You 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_39034Hi 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_39034Hi 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_170569I 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