On 07/10/2010 17:59, Rob G wrote: > Hey all, > > Recently migrated a production site (mixture of Servlets and JSPs) > from Oracle Application Server to Apache/Tomcat. Since then we have > seen numerous HTTP Error 503 - Service unavailable errors at peak > times when site is under load. mod_jk.log has the following error > message(s): > > [2184:1952] [error] jk_lb_worker.c (1473): All tomcat instances > failed, no more workers left > > I'm looking for help in trying to tweak settings to prevent this, or > confirmation that I've configured the setup correctly. > > Many thanks > Rob > > Platform: > Windows Server 2003 SP2 > > Setup: > Two tomcat instances with a single Apache front end, all on the same server > > Versions > Tomcat: 6.0.24 > Apache: 2.2.16 > mod SSL: 2.2.16 > Open SSL: 0.9.8 > mod_JK:1.2.30 > > Conf: > httpd.conf: > > <IfModule mod_jk.c> > > JkWorkersFile conf/workers.properties > JkLogFile logs/mod_jk.log > JkLogLevel error > JkLogStampFormat "[%a %b %d %H:%M:%S %Y] " > JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories > JkRequestLogFormat "%w %V %T" > > <Location /*/WEB-INF/*> > AllowOverride None > deny from all > </Location> > > JkMount /examples balancer > JkMount /examples/* balancer > JkMount /App1/* balancer > JkMount /App2/* balancer > </IfModule> > > Workers.properties: > workers.tomcat_home="C:\tomcat1" > workers.java_home="C:\Program Files\Java\jdk1.6.0_18" > ps=\ > > # Define workers > #worker.list=worker1,worker2 > worker.list=balancer > > # Set properties for worker worker1 (ajp13) > worker.worker1.type=ajp13 > worker.worker1.host=localhost > worker.worker1.port=8009 > worker.worker1.lbfactor=1 > > worker.worker1.cachesize=10 > worker.worker1.connection_pool_timeout=300 > worker.worker1.socket_keepalive=FALSE > #worker.worker1.recycle_timeout=300 > > # Set properties for worker worker2 (ajp13) > worker.worker2.type=ajp13 > worker.worker2.host=localhost > worker.worker2.port=8019 > worker.worker2.lbfactor=1 > > worker.worker2.cachesize=10 > worker.worker2.connection_pool_timeout=300 > worker.worker2.socket_keepalive=FALSE > #worker.worker2.recycle_timeout=300 > > worker.balancer.type=lb > worker.balancer.balance_workers=worker1,worker2 > worker.balancer.method=R > worker.balancer.sticky_session=True > > Server.xml (same for both tomcat instances apart from jvmRoute): > <?xml version='1.0' encoding='utf-8'?> > <Server port="8005" shutdown="SHUTDOWN"> > > <Listener className="org.apache.catalina.core.AprLifecycleListener" > SSLEngine="on" /> > <Listener className="org.apache.catalina.core.JasperListener" /> > <Listener > className="org.apache.catalina.core.JreMemoryLeakPreventionListener" > /> > <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" /> > <Listener > className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" > /> > > > <GlobalNamingResources> > > <Resource name="UserDatabase" auth="Container" > type="org.apache.catalina.UserDatabase" > description="User database that can be updated and saved" > factory="org.apache.catalina.users.MemoryUserDatabaseFactory" > pathname="conf/tomcat-users.xml" /> > </GlobalNamingResources> > > <Service name="Catalina"> > > <Connector port="8080" protocol="HTTP/1.1" > connectionTimeout="40000" > redirectPort="8443" /> > > <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> > > <Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1"> > > <Realm className="org.apache.catalina.realm.UserDatabaseRealm" > resourceName="UserDatabase"/> > > <Host name="localhost" appBase="webapps" > unpackWARs="true" autoDeploy="true" > xmlValidation="false" xmlNamespaceAware="false"> > > </Host> > </Engine> > </Service> > </Server>
[Answers own previous question] Weirdness. In addition to the previous relevant questions: Are both of the two Tomcat instances actually working? If the shutdown port is identical on both (8005), then I think the second one won't start up. The connectors certainly won't. Also, if you're using mod_jk 1.2.30 there's an example config in the install dir which uses the template config method and has good default settings. p
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