Chris, Let me see if I've got this straight. You've got: * A hw load-balancer out front * 5 physical servers each running: - 1 Apache httpd - 2 Tomcats
This allows you to have physical-server redundancy (x5) and also the ability to take one TC instance down on each server for maintenance while leaving the other one running. Right? Answer Yes this is correct First question: do all httpd instances know about all Tomcat instances? Or, does httpd only know about the two instances that are co-located with it on the same physical server? Answer Httpd only know about the two instances that re collocated with it on the same physical server If https only knows about its local 2 Tomcat instances, then you'll only need 2 workers, etc. I have no idea how this could possibly work with sticky sessions unless the hw lb knows how to dispatch to the right http/2xTomcat physical server, in which case you are wasting your time with all these extra processes. Answer The hw loadbalancer sends the traffic to 10.17.75.61 port 80... apache takes it and using the workers.properties file sends it to one of TC instances then apache sends it back through the hw lb it has a sessionid and jvm tag on in the host header so it knows which jvm it came from What about <Engine>? It would be nice to confirm that your jvmRoute(s) is(are) set correctly. Answer TC1 <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> TC2 <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm2"> That depends. The host should always be "localhost", since your httpd instances only talk to the co-located Tomcats, right? Answer Yes My next thoughts I don't know exactly how this is working but it definitely is working and doesn't seem to be getting sessions jumping from one jvm to the other (on the same physical server). I will play around with the configuration some more but this has been working for over a year. You are saying if I just go with worker.jvm1.type=ajp13 worker.jvm1.host=localhost worker.jvm1.port=8019 worker.jvm1.lbfactor=10 worker.jvm2.type=ajp13 worker.jvm2.host=localhost worker.jvm2.port=8029 worker.jvm2.lbfactor=10 worker.part.type=lb worker.part.balance_workers=jvm1,jvm2 worker.part.sticky_session=1 everything will continue to work, correct? Thanks, Martin --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
