Hello,
I'm running Apache 1.3 with mod_jk 1.2.7-dev and three instances of Tomcat 6.0.14. Because I experienced that after a certain time some database connections are not closed properly and the memory use increases, we decided to restart the Tomcat completely. But in order to have no downtime and to be able to serve all sessions, I made a special setup. We have 3 configurations for mod_jk: workers.properties-01: workers.tomcat_home=/u/www/WWW/einsurance/tomcat-01 workers.java_home=/usr/java ps=/ worker.list=loadbalancer worker.ajp13-01.port=11001 worker.ajp13-01.host=tomcathost-01 worker.ajp13-01.type=ajp13 worker.ajp13-01.lbfactor=1 worker.ajp13-01.local_worker=1 worker.ajp13-01.socket_keepalive=1 worker.ajp13-02.port=11002 worker.ajp13-02.host=tomcathost-02 worker.ajp13-02.type=ajp13 worker.ajp13-02.lbfactor=1 worker.ajp13-02.local_worker=0 worker.ajp13-02.socket_keepalive=1 worker.ajp13-03.port=11003 worker.ajp13-03.host=tomcathost-03 worker.ajp13-03.type=ajp13 worker.ajp13-03.lbfactor=1 worker.ajp13-03.local_worker=0 worker.ajp13-03.socket_keepalive=1 worker.loadbalancer.type=lb worker.loadbalancer.balanced_workers=ajp13-01, ajp13-02, ajp13-03 worker.loadbalancer.local_worker_only=0 workers.properties-02: workers.tomcat_home=/u/www/WWW/einsurance/tomcat-01 workers.java_home=/usr/java ps=/ worker.list=loadbalancer worker.ajp13-01.port=11001 worker.ajp13-01.host=tomcathost-01 worker.ajp13-01.type=ajp13 worker.ajp13-01.lbfactor=1 worker.ajp13-01.local_worker=0 worker.ajp13-01.socket_keepalive=1 worker.ajp13-02.port=11002 worker.ajp13-02.host=tomcathost-02 worker.ajp13-02.type=ajp13 worker.ajp13-02.lbfactor=1 worker.ajp13-02.local_worker=1 worker.ajp13-02.socket_keepalive=1 worker.ajp13-03.port=11003 worker.ajp13-03.host=tomcathost-03 worker.ajp13-03.type=ajp13 worker.ajp13-03.lbfactor=1 worker.ajp13-03.local_worker=0 worker.ajp13-03.socket_keepalive=1 worker.loadbalancer.type=lb worker.loadbalancer.balanced_workers=ajp13-01, ajp13-02, ajp13-03 worker.loadbalancer.local_worker_only=0 workers.properties-03: workers.tomcat_home=/u/www/WWW/einsurance/tomcat-01 workers.java_home=/usr/java ps=/ worker.list=loadbalancer worker.ajp13-01.port=11001 worker.ajp13-01.host=tomcathost-01 worker.ajp13-01.type=ajp13 worker.ajp13-01.lbfactor=1 worker.ajp13-01.local_worker=0 worker.ajp13-01.socket_keepalive=1 worker.ajp13-02.port=11002 worker.ajp13-02.host=tomcathost-02 worker.ajp13-02.type=ajp13 worker.ajp13-02.lbfactor=1 worker.ajp13-02.local_worker=0 worker.ajp13-02.socket_keepalive=1 worker.ajp13-03.port=11003 worker.ajp13-03.host=tomcathost-03 worker.ajp13-03.type=ajp13 worker.ajp13-03.lbfactor=1 worker.ajp13-03.local_worker=1 worker.ajp13-03.socket_keepalive=1 worker.loadbalancer.type=lb worker.loadbalancer.balanced_workers=ajp13-01, ajp13-02, ajp13-03 worker.loadbalancer.local_worker_only=0 Sticky Sessions are activated and necessary! Every 2 minutes a shell script (via crontab) is executed that checks whether all three instances (Tomcat-01, Tomcat-02, Tomcat-03) are running. If not all instances are running, the script starts the first (only one each time) instance from his list, that is not running (Is Tomcat-01 running? Is Tomcat-02 running? Is Tomcat-03 running?). If it has to start the third instance, it sets an at job that kills the oldest Tomcat after 60 minutes. Then it links the properties file to the specific workers.properties pasted above (e.g. workers.properties -> workers.properties-02 when Tomcat-02 is started) and gracefully restarts Apache. The effect is that the recently started Tomcat gets the new sessions (and only he!) because it's workers.properties file has been linked. Because of sticky sessions, no older session gets lost and is still served by the appropriate Tomcat. It's important that only the newest Tomcat gets the new sessions because the oldest Tomcat will be killed by an at job (and sessions must never get lost). When he gets restarted it automatically takes over the new sessions. The problem now is that local_worker_only and local_worker have been removed in newer versions of mod_jk. Is there any way to realise my current setup with the new configuration flags of workers.properties? Greetings Philipp
