iRule to redirect based on client username

If you're using basic HTTP auth, you can parse the username with HTTP::username:

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

You can map the username to pool name using a data group. To do the lookup, you can use class match -value:

when CLIENT_ACCEPTED {
 Save the VS default pool name
set default_pool [LB::server pool]
}
when HTTP_REQUEST {

 Check if the basic auth username is present
if {[HTTP::username] ne ""}{
 Check if the default 
set pool_name [class match -value [HTTP::username] equals user_to_pool_dg]
if {$pool_name ne ""}{
 Select the pool and exit the iRule event
pool $pool_name
return
}
}
 If we are still in the iRule, a pool was not selected so pick the default pool
pool $default_pool
}

Aaron