irule Troubleshooting:

Hi Nathan, thanks for your suggestion. We are currently working with this:

when CLIENT_ACCEPTED {
   set def_pool [LB::server pool]
   log local0. "def_pool is [LB::server pool]"
}

when HTTP_REQUEST {
log local0. "Incoming URI = [HTTP::uri]"
    if { [active_members [LB::server pool]] < 1 } {

            if { [active_members pool_wwbtest_wartung] > 0 } {
                    set members [active_members -list pool_wwbtest_wartung]
                    log local0. "Active members in pool_wwbtest_wartung are: $members"
                    set mypick [LB::select]
                    log local0. "The LB choice is: $mypick"
                    set newuri [string map {/wartung.html/ /} [HTTP::uri]]
                    log local0. "The new URI is = $newuri"
                    HTTP::uri $newuri
                    eval "GET [HTTP::uri $newuri] HTTP/1.1\r\nHost: $mypick\r\n\r\n"
                    log local0. "[HTTP::uri] [LB::server addr]" 
                    pool pool_wwbtest_wartung

                } elseif { [active_members pool_wwbtest_sorry] > 0 } {
                    set members [active_members -list pool_wwbtest_sorry]
                    log local0. "Active members in pool_wwbtest_sorry are: $members"
                    pool pool_wwbtest_sorry
                    set mypick [LB::select]
                    log local0. "The LB choice is: $mypick"
                    set newuri [string map {/sorry.html/ /} [HTTP::uri]]
                    log local0. "The new URI is = $newuri"
                    HTTP::uri $newuri
                    eval "GET [HTTP::uri $newuri] HTTP/1.1\r\nHost: $mypick\r\n\r\n"
                    log local0. "[HTTP::uri] [LB::server addr]" 
                    } else {
                HTTP::respond 200 content "Lieber Kunde,\r\ndie Seite befindet sich aktuell in der Wartung.\r\n\r\nDear Customer,\r\nthis site is down for maintenance. We are sorry for the inconvience.\r\n" noserver connection close
        }                   
    }
}

We've disabled members from the default pool and brought up 2 Members in the pool_wwbtest_wartung. the irule triggered correctly jumping in the "if" part, but then failed with this log message:

Feb 26 08:46:45 f5 info tmm[16796]: Rule /Common/rule_wwbtest_error_pages : Incoming URI = /

Feb 26 08:46:45 f5 info tmm[16796]: Rule /Common/rule_wwbtest_error_pages : Active members in pool_wwbtest_wartung are: {xxx.xxx.xxx.x 1080} {yyy.yyy.yyy.y 1080}

Feb 26 08:46:45 f5 err tmm[16796]: 01220001:3: TCL error: /Common/rule_wwbtest_error_pages - Prerequisite operation not in progress (line 7) (line 7) invoked from within "LB::select"

Do you have another idea what might be the problem? 🙂