Redirecting a client when "connection refused" by pool

Jon

 

 

Is the different site you want to forward users to an external web address? If so would this work?

 

 

when CLIENT_ACCEPTED {

 

if { [active_members [LB::server pool]] == 0 } {

 

HTTP::redirect "http://www.test.com"

 

}

 

}

 

 

You could always use Priority Group Activation so you can add another pool member to the pool that just has an maintenance page on it and set this pool member to only be live if all the other pool members are down. In this case you could always use an old, low spec server as the fallback here.

 

 

Hope this helps,

 

N

 

 

 

Here is Nathan's iRule with small modification: (works well for http and https)

 

 

when HTTP_REQUEST {

 

if { [active_members [LB::server pool]] == 0 } {

 

HTTP::redirect "http://www.test.com"

 

}

 

}

 

 

Priority grouping is a good idea too.

 

 

To answer Jon's question, as to: which event catches the condition of "NO members available", that would be the LB_FAILED event.

 

 

Check out this link:

 

https://devcentral.f5.com/weblogs/jason/archive/2009/09/08/irules-insight-http-event-order.aspx

 

 

 

John

 

When all of the pool members are down for a Virtual Server (VS)

That's what triggers the LB_FAILED event. Something simple like this should work:

when LB_FAILED {
  HTTP::redirect "/maintenance.html"
}

The LB_FAILED event seems to be the best option, though I do not have a complete test environment... I don't think the HTTP::redirect flies cause there's no HTTP connection (yet) to redirect.

 

 

From the wiki: (though the sample code and the text following are in conflict regarding the sequence of the "LB::reselect" and "pool" statements.)

 

 

when LB_FAILED {
07  pool my_Pool
08  LB::reselect
09  log "Selected server [LB::server] did not respond. Re-selecting node from myPool"
10}