how to insert cookie and persist to it

Hi Jucao,

 

Have you taken a look at the following Codeshare example

 

 

http://devcentral.f5.com/wiki/iRules.Manual_cookie_persistence.ashx

 

 

I don't believe it requires a persistance profile

 

 

Bhattman

Hi,Bhattman

 

Thank u for your reply

 

but actually in my enviorment ,uri didn't end like this

 

set node_forced [findstr [HTTP::uri] "?node=" 6]

 

 

so I can't use this.

 

 

do u have another way to reslove this?

 

or do u know how to optimize rand()?

Hi Jucao,

 

Here is another way to persist without a profile

 

 

http://devcentral.f5.com/wiki/iRules.ElectionHashLoadBalancingAndPersistence.ashx

 

 

You should be able to make alterations so you can use Election Hash persistence based on the URI

 

 

Bhattman

Hi,Bhattman

 

Thank u for your reply

 

sorry to not to tell u the whole story

 

 

what I am trying to acieve is:

 

 

for some specific uri,I want to send them to two pool with ration

 

for example :

 

pool cjj1 20% traffic

 

pool cjj2 80% traffic

 

and for the traffic hit pool cjj1,make them hit cjj1 always during the session,for pool cjj2,do the same

 

 

so I use:

 

 

1:when HTTP_REQUEST timing on {

 

if {[class match $uri starts_with gen3abURLs_SRWD29]} {

 

 

if {[HTTP::cookie valueA_cookie] == 1}{

 

pool cjj1

 

return

 

}

 

if {[HTTP::cookie value B_cookie] == 1}{

 

pool cjj2

 

return

 

}

 

if { rand() <0.2 } {

 

pool cjj1

 

set A_cookie 1

 

return

 

}

 

else {

 

pool cjj2

 

set B_cookie 1

 

return

 

}

 

when HTTP_RESPONSE {

 

if { $A_cookie == 1 }{

 

HTTP::cookie insert name A_cookie value 1 path "/"

 

}

 

if { $B_cookie == 1 }{

 

HTTP::cookie insert name B_cookie value 1 path "/"

 

}

 

 

this irule do meet my requirement,but I checked the performance，it is not good,I think it is rand() make the performance bad,but I don't know how to optimize it

 

that is why I am trying to work around this

 

 

2:so I want to put members in cjj1 and cjj2 to a single pool ,we suppose cjjall and use ratio method in pool

 

the next step is to persist the request to the same pool member without profile

 

 

the link http://devcentral.f5.com/wiki/iRules.ElectionHashLoadBalancingAndPersistence.ashx show us how to lb to pool members ,but not to ratio

 

 

do u have some metod to work around this?

 

Hi Jucao,

 

Thanks for explanation. This was extremely helpful in understanding your issue.

 

 

Let's first approach your first issue where you want to make the iRule more efficient and bring down the cycles, before moving into item 2

 

 

The following is the code re-written to use switch commands and expression commands.

 

 

when HTTP_REQUEST timing on {
if {[class match $uri starts_with gen3abURLs_SRWD29] } { 
log local0. "Entering testi"
set rand [expr { rand() }]
set value_cookie ""
switch -glob [HTTP::cookie value_cookie] {
"1" { 
pool cjj1
}
"2" {
Pool cjj2"
}
default {
if { $rand <0.2 } {
Pool cjj1
set value_cookie 1
}
else {
pool cjj2
set value_cookie 2
}
}
}
}
}


when HTTP_RESPONSE {
   if {$value_cookie ne "" } {
HTTP::cookie insert name value_cookie value $value_cookie path "/" 
}
}

 

 

Hopefully that will drop the cycles down enough to be efficient for you.

 

 

Bhattman

 

 

Hi,Bhattman

 

the performance has improved in my env

 

pls see

 

[jucao@srwd00lba001:/S1-green-P:Active] ~ b rule SRWD29-Main-rb1115test show all

 

RULE SRWD29-Main-rb1115test

 

+-> HTTP_REQUEST 182 total 0 fail 0 abort

 

| | Cycles (min, avg, max) = (0, 743327, 940739)

 

+-> HTTP_RESPONSE 182 total 0 fail 0 abort

 

| Cycles (min, avg, max) = (0, 0, 0)

 

 

[jucao@srwd00lba001:/S1-green-P:Active] ~ b rule SRWD29-Main-rb1112 show all

 

RULE SRWD29-Main-rb1112

 

+-> HTTP_REQUEST 64 total 0 fail 0 abort

 

| | Cycles (min, avg, max) = (0, 428880, 527337)

 

+-> HTTP_RESPONSE 64 total 0 fail 0 abort

 

| Cycles (min, avg, max) = (0, 0, 0)

 

 

hhahaha,

 

thanks very much

 

 

I need to tell u if I put set value_cookie "" under the if {[class match $uri starts_with gen3abURLs_SRWD29] },in bigip log,we will see error ,like we don't have value_cookie

 

so I put set value_cookie "" under the when HTTP_REQUEST timing on .

 

Is it right?

 

 

your script is so great to resolve this.

 

Do u have method to fix the item2?

 

Hi Jucao,

 

Good to hear that the cycles came down.

 

 

I don't have syntax for item 2 but I suppose it would be somewhat similar to item 1 code

 

 

The following is untested iRule.

 

 

 

when HTTP_REQUEST timing on {

 

set uri [string tolower [HTTP::uri]]

 

if {[class match $uri starts_with gen3abURLs_SRWD29] } {

 

if {[HTTP::cookie value_cookie] ne "" } {

 

pool cjjlb member $value_cookie

 

}

 

}

 

}

 

 

when LB_SELECTED {

 

set lbvalue "[LB::server_addr] [LB::server port]"

 

 

when HTTP_RESPONSE {

 

if {$lbvalue ne "" } {

 

HTTP::cookie insert name value_cookie value $lbvalue path "/"

 

}

 

}

 

 

 

I hope this helps

 

Bhattman

 

Hi,Bhattman

 

1:can u tell me why item1 has improved

 

set rand [expr { rand() }]

 

I have changed it as

 

set BigipABurl_cookie ""

 

if {[class match $uri starts_with gen3abURLs_SRWD29]} {

 

set rand [expr { rand() }]

 

switch -glob [HTTP::cookie BigipABurl_cookie] {

 

"1" {

 

pool SRWD29-G3-BRX

 

return

 

}

 

"2" {

 

pool SRWD29-BROWSE

 

return

 

}

 

default {

 

if { $rand <0.2 } {

 

pool SRWD29-G3-BRX

 

set BigipABurl_cookie 1

 

return

 

}

 

else {

 

pool SRWD29-BROWSE

 

set BigipABurl_cookie 2

 

return

 

}

 

}

 

}

 

}

 

when HTTP_RESPONSE {

 

if {$BigipABurl_cookie ne "" } {

 

HTTP::cookie insert name BigipABurl_cookie value $BigipABurl_cookie path "/"

 

}

 

 

2:I have changed it as:

 

 

when HTTP_REQUEST timing on {

 

set uri [string tolower [HTTP::uri]]

 

if {[class match $uri starts_with gen3abURLs_SRWD29] } {

 

if {[HTTP::cookie value_cookie] ne "" } {

 

pool cjjlb member $value_cookie

 

}

 

else {

 

pool cjjb

 

}

 

}

 

 

when LB_SELECTED {

 

set lbvalue "[LB::server_addr] [LB::server port]"

 

 

when HTTP_RESPONSE {

 

if {$lbvalue ne "" } {

 

HTTP::cookie insert name value_cookie value $lbvalue path "/"

 

}

 

}

 

for this method,I have a question

 

we didn't define $value_cookie

 

also I want to know when n variable will change during the connection

 

for example ,we define $value_cookie ,and it get a value in http_request,we can find this value in http_response

 

 

btw,what is the unit of cycle?

 

[jucao@srwd00lba001:/S1-green-P:Active] ~ b rule SRWD29-Main-rb1112 show all

 

RULE SRWD29-Main-rb1112

 

+-> HTTP_REQUEST 64 total 0 fail 0 abort

 

| | Cycles (min, avg, max) = (0, 428880, 527337)

 

+-> HTTP_RESPONSE 64 total 0 fail 0 abort

 

| Cycles (min, avg, max) = (0, 0, 0)

 

 

what does it mean? for example should I notice if it is 500000 ,how about 300000.

 

do they have big difference?

hI,Bhattman

 

In item 2,

 

when HTTP_REQUEST timing on {

 

set uri [string tolower [HTTP::uri]]

 

if {[class match $uri starts_with gen3abURLs_SRWD29] } {

 

if {[HTTP::cookie value_cookie] ne "" } {

 

pool cjjlb member $value_cookie

 

}

 

else {

 

pool cjjb

 

}

 

}

 

 

when LB_SELECTED {

 

set lbvalue "[LB::server_addr] [LB::server port]"

 

 

when HTTP_RESPONSE {

 

if {$lbvalue ne "" } {

 

HTTP::cookie insert name value_cookie value $lbvalue path "/"

 

}

 

}

 

 

first request is ok,IE can get the page and get the cookie(10.80.29.15 80)

 

However,the second request with the cookie ,it doesn't work,even the value_cookie is ip and port of the node

 

if I change it to the exact node ,such as, pool cjjlb member 10.80.29.15 80 in irule,it works,

 

I don't know why

 

can u try it in your lab