iRule to bypass default pool

srantos,

Try adding some logging to see if this points you in the right direction, also added string tolower command to rule out uppercase / lowercase issues.

when HTTP_REQUEST {
  if {[string tolower [HTTP::host]] contains "facebook"}{
  log local0. "HTTP Host: [HTTP::host]"
  pool isa_pool
  snat automap
}
} 

Hope this helps,

N

This is the default connection based load balancing behavior. To have LTM load balance per HTTP request you can either add a OneConnect profile to the VS or specify a pool in every case when you're specifying a pool for any case. Here's an example of the latter:

when CLIENT_ACCEPTED {
 Save the name of the VS default pool before it is changed in this iRule
set default_pool [LB::server pool]
}
when HTTP_REQUEST {
if {[string tolower [HTTP::host]] contains "facebook"}{
log local0. "Using isa pool for HTTP Host: [HTTP::host]"
pool isa_pool
snat automap
} else {
log local0. "Using default pool $default_pool for HTTP Host: [HTTP::host]"
pool $default_pool
snat none
}
}

Aaron

I meant to include a link to more info on this:

 

 

http://devcentral.f5.com/wiki/default.aspx/AdvDesignConfig/oneconnect.html

 

 

Aaron

Thank you hoolio and nathan.

 

 

I have used the log and else statements you advised and it works now. In /var/log/ltm I can see that the correct pool is selected for every http request.

 

 

However I still see some traffic with tcpdump to the isa pool when browsing to "www.google.com" but they are only "tcp fin-ack" messages. I assume that they are just expired sessions from previous iRule matches.