Forum Discussion
Nimbostratusirule, pool persistence based on cookie value
I'm hoping you guys can help me out. I have fumbled my way through this for weeks now. I'm trying to write an irule that routes to a different pool based on the value of a cookie.
#1 https://myapp.domain.com/alpha
#2 https://myapp.domain.com/alpha?arg=A
#3 https://myapp.domain.com/alpha?arg=B
The app by default should go to #1. I'm having to pass an argument in browser as workaround to test hitting against another pool. The app does several 302 redirects before the page loads, so I lose the (?agr= ) in uri after the initial execution. The first part works fine. It sends to the correct pool based on the arg set. It's on the redirects that have the issue. Since the arg= is no longer set it falls into the last else. I'm checking for the cookie, but it is not there anymore and falls to the default.
when HTTP_REQUEST {
set webUri [HTTP::uri]
set webHost [ string tolower [HTTP::host] ]
HTTP::header insert X-Forwarded-For [IP::remote_addr]
HTTP::header insert X-Forwarded-Host [HTTP::host]
if { ($webUri ends_with "arg=1") } {
set orig_cookie [HTTP::cookie value "valueA"]
pool POOL1
return
}
elseif { ($webUri ends_with "arg=2") } {
set orig_cookie [HTTP::cookie value "valueB"]
pool POOL2
return
}
else {
if { ( [HTTP::cookie exists cookie] ) } {
set new_cookie [HTTP::cookie value orig_cookie]
return
}
else {
set new_cookie [HTTP::cookie value null]
}
}
}
switch $new_cookie {
"valueA" {
pool POOL1
return}
"valueB" {
set tls no
pool POOL2
return}
default {
pool POOL3
return}
}
when HTTP_RESPONSE {
set node [IP::server_addr]:[TCP::server_port]
set nodeResp [HTTP::status]
# log connection info
log local0. [LB::server]
log local0. $node
log local0. $nodeResp
}
Yoann_Le_Corvi1Cumulonimbus
Hi,
Have you first considered using universal persistence.
https://support.f5.com/csp/article/K7392
When you say "to a different pool based on the value of a cookie", how is value of the cookie set up at the first place ?
The idea would be to insert a cookie in the first response "poolselect" set to A, B, C. And then persist on that cookie value.
Yoann