Re: Configure Apache to propagate servlet down condition back to load balancer

Bruce Atherton <bruce@xxxxxxxxxxxxx> · Thu, 01 May 2008 13:04:08 -0700

Thanks, Serge. Sorry for being off-topic, but I didn't know whether the 

solution lay in configuring Apache or not. It seemed like Apache was the 

intermediary between the two systems, and so seemed like the logical 

place to detect the failure of one system and pass it on to the other. I 

am glad that a better solution exists.

Thanks for your help.

Serge Dubrouski wrote:

I think it's quite possible and fairly easy. BigIP allows you to
create a custom HTTP/S monitors for a particular URL. So create a
monitor that will get not just "/" but some URL that point to your
Servlet Container and then set up a "Receive String" to expect
something like "200 OK". So in case if your Servelet Container goes
down Apache will answer with 503 error code, BigIP wont see 200 and
will mark that particular member as down.

Sorry, this item is little bit an off topic for this forum because it
mostly relates to BigIP, not to Apache.

On Thu, May 1, 2008 at 1:13 PM, Bruce Atherton <bruce@xxxxxxxxxxxxx> wrote:

I have the following configuration:

   BIG-IP   ->  Apache HTTPD  ->  Servlet Container
    Load    ->  Apache HTTPD  ->  Servlet Container
  Balancer  ->  Apache HTTPD  ->  Servlet Container

 The Apache HTTPD instance serves up static content and translates HTTPS
requests into HTTP. Dynamic content is proxied to a Servlet Container
running an application.

 My problem is that when one of the servlet containers seizes up, the BIG-IP
box doesn't take the Apache instance out of circulation. Instead, users are
continually connected to non-responsive servlets.

 Is there any way to configure Apache so that it is identifies itself as
unavailable to the BIG-IP box if it finds that all proxy requests are
failing?

 Thanks for any help.

 ---------------------------------------------------------------------
 The official User-To-User support forum of the Apache HTTP Server Project.
 See <URL:http://httpd.apache.org/userslist.html> for more info.
 To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
  "   from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx
 For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx

---------------------------------------------------------------------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
  "   from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx
For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx