Tomcat 세션 클러스터링 mod_jk

개요

WAS 2대 이상에서 동일 세션을 유지·복제. sticky + Cluster 복제.

① 1대 서버 Tomcat 2개 (테스트)

1. Tomcat 복사 후 server.xml 포트 +1 (예: Server 8006 / HTTP 8081 / AJP 8010)
2. Apache workers.properties

worker.list=loadbalancer
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=tomcat1,tomcat2
worker.loadbalancer.sticky_session=1

worker.tomcat1.type=ajp13
worker.tomcat1.host=localhost
worker.tomcat1.port=8009
worker.tomcat1.lbfactor=1

worker.tomcat2.type=ajp13
worker.tomcat2.host=localhost
worker.tomcat2.port=8010
worker.tomcat2.lbfactor=1

1. JkMount /*.do loadbalancer, JkMount /*.jsp loadbalancer
2. 각 <Engine jvmRoute="tomcat1"> / tomcat2

② LB + WEB 2 + WAS 2 (이중화)

• WEB별 workers.properties에 WAS IP:AJP, lbfactor 배분
• httpd에 mod_jk (JkWorkersFile, JkLogFile 등)
• WAS별 jvmRoute + 아래 Cluster

Cluster (server.xml)

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
  <Manager className="org.apache.catalina.ha.session.DeltaManager"
           expireSessionsOnShutdown="false" notifyListenersOnReplication="true"/>
  <Channel className="org.apache.catalina.tribes.group.GroupChannel">
    <Membership className="org.apache.catalina.tribes.membership.McastService"
                address="228.0.0.4" port="45564" frequency="500" dropTime="3000"/>
    <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
              address="auto" port="4000" autoBind="100" selectorTimeout="5000" maxThreads="6"/>
    <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
      <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
    </Sender>
    <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
  </Channel>
  <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
         filter=".*\.gif|.*\.js|.*\.jpeg|.*\.jpg|.*\.png|.*\.htm|.*\.html|.*\.css|.*\.txt"/>
  <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
  <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>

• Receiver port는 WAS별 중복 금지
• web.xml에 <distributable/> 필수
• Tomcat 8+: MessageDispatch15Interceptor 제거

확인

세션 테스트 JSP → Session ID 접미사(.tomcat1/.tomcat2) 확인 → 노드 중지 후 접미사만 바뀌면 성공.