Jai wrote:
Very good, so now we know something more : that you are using mod_jk as the Apache-to-JBoss Connector.Apache is acting as a front end webserver and it sends requests to Jboss application server. We have configured Jboss servers as a workers in apache workers.properties file. We have specified Jboss host name in workers.properties
(Why is this kind of information always so hard to pry out of posters ?)I believe that there was a thread on the Tomcat users forum, not so long ago (less than 6 months), which touched on this issue.
(The Tomcat users support list has a lot of messages about mod_jk).The point is : if in your "workers.properties" file, you have something like this :
worker.ajp13.host=tomcat.mycompany.comthen it means that in order to pass the request to the correct host, mod_jk has to do at least one DNS lookup, to get the IP address of this host. Of course, it would be very inefficient to re-do this DNS lookup at each request, so it is done once, and the result is cached.
Of course if you change the IP address of Tomcat without letting mod_jk know, it is going to get confused. So you need a way to force mod_jk to re-do this DNS lookup.
I believe that doing an Apache httpd "graceful restart" would do it.But do not take my word for it, and do a search on the Apache and Tomcat forums, using the words above. Some of the mailing list archives mentioned on their respective website homepages are searchable.
Now, I do have a question however :You cannot just "change the IP address" of a Tomcat's host dynamically, can you ? So what's exactly the point of this whole exercise ?
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