Trying to write an irule which inspects url parameters to select the appropriate pool

is this applicable?

[root@ve1024:Active] config  b virtual bar list
virtual bar {
   snat automap
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   persist cookie
   profiles {
      http {}
      tcp {}
   }
}
[root@ve1024:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        if { [HTTP::query] ends_with "1" } {
                pool foo1
        } elseif { [HTTP::query] ends_with "2" } {
                pool foo2
        } else {
                persist none
                pool foo
        }
}

when SERVER_CONNECTED {
        log local0. "[IP::client_addr]:[TCP::client_port] -> [clientside {IP::local_addr}]:[clientside {TCP::local_port}] -> [IP::remote_addr]:[TCP::remote_port]"
}
}
[root@ve1024:Active] config  b pool foo list
pool foo {
   members 200.200.200.101:80 {}
}
[root@ve1024:Active] config  b pool foo1 list
pool foo1 {
   members 200.200.200.101:80 {}
}
[root@ve1024:Active] config  b pool foo2 list
pool foo2 {
   members 200.200.200.102:80 {}
}

[root@ve1024:Active] config  curl -I http://172.28.19.79/?test=xyz1
HTTP/1.1 200 OK
Date: Sat, 02 Jun 2012 15:22:29 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Fri, 11 Nov 2011 14:48:14 GMT
ETag: "4183e4-3e-9c564780"
Accept-Ranges: bytes
Content-Length: 62
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo1=1707657416.20480.0000; path=/

/var/log/ltm
Jun  2 08:22:09 local/tmm info tmm[4793]: Rule myrule : 172.28.19.80:52027 -> 172.28.19.79:80 -> 200.200.200.101:80

[root@ve1024:Active] config  curl -I http://172.28.19.79/?test=xyz2
HTTP/1.1 200 OK
Date: Sat, 02 Jun 2012 15:12:53 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Tue, 08 Nov 2011 12:26:29 GMT
ETag: "4183f1-30-47e02740"
Accept-Ranges: bytes
Content-Length: 48
Content-Type: text/html; charset=UTF-8
Set-Cookie: BIGipServerfoo2=1724434632.20480.0000; path=/

/var/log/ltm
Jun  2 08:22:36 local/tmm info tmm[4793]: Rule myrule : 172.28.19.80:57225 -> 172.28.19.79:80 -> 200.200.200.102:80

[root@ve1024:Active] config  curl -I http://172.28.19.79/?test=xyz3
HTTP/1.1 200 OK
Date: Sat, 02 Jun 2012 15:23:17 GMT
Server: Apache/2.2.3 (CentOS)
Last-Modified: Fri, 11 Nov 2011 14:48:14 GMT
ETag: "4183e4-3e-9c564780"
Accept-Ranges: bytes
Content-Length: 62
Content-Type: text/html; charset=UTF-8

/var/log/ltm
Jun  2 08:22:57 local/tmm info tmm[4793]: Rule myrule : 172.28.19.80:57226 -> 172.28.19.79:80 -> 200.200.200.101:80

Thanks for such a quick response. This is great help. Now if I remember right, to use cookie persistence where the pools foo1 and foo2 have different members, I need to use oneconnect as well on the virtual server. Do you agree?

 

 

Also what will be the difference in setting cookie after the parameter matches, instead of defining it at the virtual server definition?

 

 

Thanks.

Now if I remember right, to use cookie persistence where the pools foo1 and foo2 have different members, I need to use oneconnect as well on the virtual server. Do you agree? are you talking about this one?

sol9800: Using an iRule to load balance HTTP requests to multiple pools

http://support.f5.com/kb/en-us/solutions/public/9000/800/sol9800.html

well, i think using oneconnect is fine.

Also what will be the difference in setting cookie after the parameter matches, instead of defining it at the virtual server definition? i got an error.

[root@ve1024:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
        if { [HTTP::query] ends_with "1" } {
                persist cookie
                pool foo1
        } elseif { [HTTP::query] ends_with "2" } {
                persist cookie
                pool foo2
        } else {
                pool foo
        }
}

when SERVER_CONNECTED {
        log local0. "[IP::client_addr]:[TCP::client_port] -> [clientside {IP::local_addr}]:[clientside {TCP::local_port}] -> [IP::remote_addr]:[TCP::remote_port]"
}
}
[root@ve1024:Active] config  b virtual bar list
virtual bar {
   snat automap
   destination 172.28.19.79:80
   ip protocol 6
   profiles {
      http {}
      tcp {}
   }
}

[root@ve1024:Active] config  b virtual bar rule myrule
BIGpipe unknown operation error:
   01070372:3: Persistence mode (Cookie) called out in rule (myrule) requires a corresponding persistence profile for virtual server (bar).

Thank You. I will try these suggestions right away..

You might want to check the specific parameter value to see if it ends in 0 or 1 instead of the full query string to be more exact. You can use [URI::query [HTTP::uri] id] to get the id parameter value.

 

 

And if subsequent requests don't have that parameter set and you still want to persist clients to the prior pool, you will probably want to set a cookie to track when a pool selection has been made and then look for that cookie on requests without the id parameter.

 

 

Here's a related example:

 

 

https://devcentral.f5.com/Community/GroupDetails/tabid/1082223/asg/50/aft/2158969/showtab/groupforums/Default.aspx2234700

 

 

Aaron

Here's another example of selecting a pool *member* by query string parameter value:

 

 

https://devcentral.f5.com/wiki/iRules.Select_pool_member_based_on_HTTP_query_string_parameter.ashx

 

 

Aaron

thanks Aaron. nice comment!

Thanks Aaron for the links.