redirect based on monitor status

Hi Kevin and Nitass,

 

 

First off thanks for your input. As it turns out I had not really stopped to consider the disable string functionality until Nitass pointed it out to me. That is basically what I am looking for but I had not realized it was available until today. Based on that knowledge I played around a little bit today until I got the following basic irule to work.

 

 

when HTTP_REQUEST {

 

if { [LB::status pool application-maintenance-pool member 192.168.2.1 443 ] eq "session_disabled" } {

 

log local0.info "Server marked disabled, maintenance page enabled"

 

HTTP::redirect "http://example.com/errors/maintenance.html"

 

}

 

}

 

 

This is great but as I was considering this sitaution again today I realized that historically my logic has been a bit confused regarding monitors and status changes. In the past I have been using simple file monitors that check for the contents of a file and if that check fails the respective node is pulled from pool. This was being used by administrators to pull hosts from their pools on demand. However, what I really wanted was the stop accepting new connections and let the existing connections complete their session and for this I shoud have been using the "recv disable" response.

 

 

So, with this new knowledge and much to Kevin's point I wonder if it is a good idea to splash a maintenance page based on the status of a single node in the pool. I think a better plan is to allow all nodes in the pool to return a "session_disabled" status. At at this point I would like to put up a site down for maintenance page for any new connections.

 

 

The other conditional here woud be that if alll nodes in a pool return a "down" status then I would like to put up a "sorry we are experiencing technical difficulties" page.

 

 

The problem I have now is how to confirm that all nodes in a pool are in a disabled status. The following code is close but I do not have a way to test the total response from a pool.

 

 

when HTTP_REQUEST {

 

if { [LB::status pool testapp-pool member 192.168.2.1 443 ] eq "session_disabled" } {

 

log local0.info "Server marked disabled, maintenance page enabled"

 

HTTP::redirect "http://example.com/errors/maintenance.html"

 

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

 

HTTP::redirect "http://example.com/errors/sitedown.html"

 

log local0.info "no active enabled members in pool, site down enabled"

 

} elseif {[HTTP::uri] equals "/" } {

 

HTTP::redirect "https://[HTTP::host]/default/logon"

 

}

 

 

I tried to use something like [ LB::status ] eq "session_disabled" but this did not seem to evaluate the pool which I sort of expected as the status argument assumes the node has already been selected. But maybe that is how I should start my loop assuming that is an option.

 

 

Thanks.