Distribute load based on uri

Here is another one

 

 

 when RULE_INIT { 
    set counter 0 
 } 
 when HTTP_REQUEST { 
     if {$::counter <= 7} { 
      The first 7 requests are redirected to  URI 1 
       HTTP::redirect "http://uri1" 
       incr $::counter 
    } elseif {$::counter <= 10 } { 
       The next 3 requests are redirect to URI 2 
       HTTP::redirect "http://uri2" 
       incr $::counter 
    } else { 
      Reset counter and send the 11th request to URI 1 
      set $::counter 0 
       HTTP::redirect "http://uri1" 
    } 
 }   
 

 

 

Again this is all untested conceptual irule code

 

 

Bhattman

 

I think Bhattman's example would work. But the downside to using a global counter is that it will prevent the VS from being "load balanced" across all of the TMM cores or CPUs (if you're on a CMP capable platform and LTM version). Another poster, Kev, came up with a simple solution for scenarios like this:

 http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/aff/5/afv/topic/aft/1172658/afc/1196453/Default.aspx

when HTTP_REQUEST { 
   if { rand() > 0.02 } { 
      pool default-pool 
   } else { 
      pool marketing-pool 
   } 
} 

You could adapt this to your scenario:

 http://devcentral.f5.com/Community/GroupDetails/tabid/1082223/aff/5/afv/topic/aft/1172658/afc/1196453/Default.aspx

when HTTP_REQUEST {

    Check if URI is one we want to redirect
   if {[HTTP::uri] contains "search"}{

      if { rand() > 0.70 } {
         HTTP::redirect "http://uri1"
      } else { 
         HTTP::redirect "http://uri2"
      } 
   } 
}

Aaron

Out of curiosity, anything wrong with sending traffic to a pool with 7:3 ratio and then choosing our redirect based on IP:addr [server_addr] ?

Spark suggested something similar a while back:

 

 

http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&postid=812734&ptarget=812767

 

 

But I think Kev's method is even simpler and more efficient.

 

 

Aaron

Wow, I like those suggestions a lot. The one about using the random function is simply brilliant ! Thanks guys, I will try it out soon.