How can I force a request through mod_jk down to a specific worker?

Question

If I have mod_jk set up with several workers and a load balancer worker, is there a request parameter or something that would allow me to force a specific http request down to a specific worker. For instance if I have a worker worker1 is there something like this:

http://www.example.com?worker=worker1

Often we need to troubleshoot problems on a specific server in the cluster and being able to force the request directly to that server is essential.

Answer 1

1. Tweak the value of your JSESSIONID cookie. The end has the name of the worker you're stuck to (assuming you're doing sticky sessions)

2. Use SetHandler as described here http://tomcat.apache.org/connectors-doc/reference/apache.html instead of JKMount directives

   Something like this:

   
      <Location />  
         SetHandler jakarta-servlet  
         SetEnvIf REQUEST_URI ^/.*\?.*worker=(\w+)&?$ JK_WORKER_NAME=$1  
      </Location>