A/B Site Testing

Well, without seeing your exact rule, I can't give you a modified version that functions on the "no cookie exists" case, but here's an example of how to check for a cookie, and if it's not present, route to a specific pool.

if(not (exists http_cooke("some_cookie"))) {
  use pool no_cookie
}

So, you could use the same rule structure, but replace the cookie name with the cookie you're looking for.

Hope this helps,

-Colin

Hi Colin,

 

 

thanks for the reply.

 

 

I already have the cookie part setup and working. The problem I now have is that if the cookie does not exist all connections will be sent to the ChannelB Pool.

 

Is there a way I can load-balance between both Pools - ie: half the traffic going to each of the Pools if there is no cookie found.

 

 

 

if (exists http_cookie("cookietest") and http_cookie("cookietest") contains "ChannelA") {

 

log "ChannelA used"

 

use pool ChannelA

 

}

 

else {

 

if (exists http_cookie("cookietest") and http_cookie("cookietest") contains "ChannelB") {

 

log "ChannelB used"

 

use pool ChannelB

 

}

 

else {

 

log "Cookie NotFound"

 

 

}

 

}

 

 

 

 

Regards

 

Ronan

Ronan,

probably the simplest solution is to create another pool which is union of ChannelA and ChannelB nodes. If you use round-robin loadbalancing method (which is the default) and you interleave A and B nodes in the new pool, you will (in average) get 50:50 distribution of connections to A and B nodes via the new pool.

Here is how the configuration may look like:

pool ChannelA {
   member 10.1.1.1:80
   member 10.1.1.2:80
}
pool ChannelB {
   member 10.1.2.1:80
   member 10.1.2.2:80
}
pool ChannelAB {
   member 10.1.1.1:80
   member 10.1.2.1:80
   member 10.1.1.2:80
   member 10.1.2.2:80
}
rule distributor {
   if (exists http_cookie("cookietest") and http_cookie("cookietest") contains "ChannelA") {
      log "ChannelA used"
      use pool ChannelA
   }
   else {
   if (exists http_cookie("cookietest") and http_cookie("cookietest") contains "ChannelB") {
      log "ChannelB used"
      use pool ChannelB
   }
   else {
      log "Cookie NotFound"
      use pool ChannelAB
   }
}

If you have other preferences how to distribute connections to servers, you may want to use the direct node selection feature in the ChannelAB pool. See BIG-IP Reference Guide for details.