Would Pool Selection Override Persistent Rules

I have a VS that has a persistence profile applied to it, which sets a uie type persistence based on a particular header content. This VS also has an iRule where decisions based on URL are made so the client is sent to the correct pool.

 

 

It seems that the persistence records are ignored when a different pool is selected.

 

 

see bellow my config:

 

 

 

rule persist_msisdn_project {

 

when HTTP_REQUEST {

 

if { [HTTP::header exists "User-Agent"]} {

 

set getuseragent [HTTP::header "User-Agent"]

 

binary scan $getuseragent H* hexi

 

set useragent [regsub -all (..) $hexi {\1}]

 

} else {

 

set useragent ""

 

}

 

 

if { [HTTP::header exists "X-Header-msisdn"]} {

 

set persist_data [HTTP::header "X-Header-msisdn"]

 

set logStr "Persist on X-Header-msisdn"

 

} elseif { [HTTP::header exists "MSISDN"]} {

 

set persist_data [HTTP::header "MSISDN"]

 

set logStr "Persist on MSISDN"

 

} else {

 

set persist_data [IP::client_addr].$useragent

 

set logStr "Persist on Client IP Address and User-Agent"

 

}

 

persist uie $persist_data 1800

 

}

 

}

 

 

profile persist msisdn_persistence_profile {

 

defaults from universal

 

mode universal

 

mirror disable

 

rule persist_msisdn_project

 

}

 

 

virtual VIP-Project {

 

destination A.A.A.A:http

 

snat automap

 

fallback persist source_addr

 

ip protocol tcp

 

profile http tcp

 

persist msisdn_persistence_profile

 

rule project-Rule

 

vlans DMZ enable

 

}

 

 

rule project-Rule {

 

when HTTP_REQUEST {

 

if { [HTTP::uri] contains "/project/url-03" } {

 

HTTP::uri [string map { "/project/url-03" "/url-01" } [HTTP::uri]]

 

pool project_Pool_01

 

return

 

}

 

if { [HTTP::uri] contains "/project/url-02" } {

 

HTTP::uri [string map { "/project/url-02" "/url-02" } [HTTP::uri]]

 

pool project_Pool_02

 

return

 

}

 

if { [HTTP::uri] contains "/project/url-03" } {

 

HTTP::uri [string map { "/project/url-03" "/url-03" } [HTTP::uri]]

 

pool project_Pool_03

 

return

 

}

 

HTTP::respond 200 content "Invalid request in project rule"

 

return

 

}

 

}

 

 

pool project_Pool_01 {

 

action on svcdown reselect

 

slow ramp time 300

 

monitor all tcp

 

member 192.168.161.101:8044

 

member 192.168.161.111:8044

 

}

 

 

pool project_Pool_02 {

 

action on svcdown reselect

 

slow ramp time 300

 

monitor all tcp

 

member 192.168.162.121:8044

 

member 192.168.162.121:8044

 

}

 

 

pool project_Pool_03 {

 

action on svcdown reselect

 

slow ramp time 300

 

monitor all tcp

 

member 192.168.163.131:8044

 

member 192.168.163.131:8044

 

}

 

 

 

 

I can see that same source requests coming with a particular header (say for example X-Header-msisdn) and for a specific URL (say /project/url-02 ) are forwarded to either node in the pool (in this case project_Pool_02). I would have expected to have the requested persisted to the same node in the pool. Somehow the persistence is set (I did some logging from the persistence rule and I could see the persisnce record set to the correct value of the header), but then when the request is directed to the pool, the roun-robin algorith kicks in and selects whichever node in the pool is available.

 

 

What am I doing wrong here?

 

 

Thank you in advance,

 

Adrian