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From John Rellis <>
Subject Clustering Question
Date Mon, 17 Sep 2012 19:50:34 GMT

In Summary, I was hoping somebody could look over my configuration and give
me some guidance.  I have configured what I think I need to and I have no
evidence to suggest anything is working and I don't know how to verify the
pieces of the puzzle.  Any help on troubleshooting would be excellent!

I am using tomcat 7, Apache/2.2.22 (Ubuntu) and the latest ubuntu LTS.

The architecture I am attempting is on EC2, I have disabled firewalls
during testing. Here is the architecture I think I need :

A ubuntu server with an apache web server using mod_jk to create a load
balancer for two other servers that are running tomcat.  The tomcat
instances are running a grails app called ClusterApp.

This ClusterApp can be reached on http://tomcatone:8080/ClusterApp and on

tomcatone and tomcattwo are in my /etc/hosts file.

I am pretty sure mod_jk is installed correctly.  I'll show you what files I
think I need to set up clustering and how they are set up.  The Tomcats and
apache are starting and I have no idea where to go from there so any help
would be great!!!

I am trying to hit http://balancer/ClusterApp and nothing is happening.  my
app has the <distributable/> element

Many thanks!

This is my (on balancer server)

# Define worker names

worker.list=jk-status, LoadBalancer

# Create virtual workers



# Declare Tomcat server workers 1 through n





# Associate real workers with virtual LoadBalancer worker


This is in my apache2.conf (should maybe be in jk.conf??, on balancer

JkMount /ClusterApp* LoadBalancer

This is my jk.conf (on balancer server)

<IfModule jk_module>

    # We need a workers file exactly once
    # and in the global server
    JkWorkersFile /etc/apache2/conf/

    # Our JK error log
    # You can (and should) use rotatelogs here
    JkLogFile /var/log/apache2/mod_jk.log

    # Our JK log level (trace,debug,info,warn,error)
    JkLogLevel debug

    # Our JK shared memory file
    JkShmFile /var/log/apache2/jk-runtime-status

    JkWatchdogInterval 60

    # Configure access to jk-status and jk-manager
    # If you want to make this available in a virtual host,
    # either move this block into the virtual host
    # or copy it logically there by including "JkMountCopy On"
    # in the virtual host.
    # Add an appropriate authentication method here!
    <Location /jk-status>
        # Inside Location we can omit the URL in JkMount
        JkMount jk-status
        Order deny,allow
        Deny from all
        Allow from all
    <Location /jk-manager>
        # Inside Location we can omit the URL in JkMount
        JkMount jk-manager
        Order deny,allow
        Deny from all
        Allow from all


This is my server.xml on my tomcat servers
<?xml version='1.0' encoding='utf-8'?>
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  See the License for the specific language governing permissions and
  limitations under the License.
<!-- Note:  A "Server" is not itself a "Container", so you may not
     define subcomponents such as "Valves" at this level.
     Documentation at /docs/config/server.html
<Server port="8005" shutdown="SHUTDOWN">
  <!-- Security listener. Documentation at /docs/config/listeners.html
  <Listener className="" />
  <!--APR library loader. Documentation at /docs/apr.html -->
  <Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on" />
  <!--Initialize Jasper prior to webapps are loaded. Documentation at
/docs/jasper-howto.html -->
  <Listener className="org.apache.catalina.core.JasperListener" />
  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />

  <!-- Global JNDI resources
       Documentation at /docs/jndi-resources-howto.html
    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users
    <Resource name="UserDatabase" auth="Container"
              description="User database that can be updated and saved"
              pathname="conf/tomcat-users.xml" />

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" Note:  A "Service" is not itself a "Container",
       so you may not define subcomponents such as "Valves" at this level.
       Documentation at /docs/config/service.html
  <Service name="Catalina">

    <!--The connectors can use a shared executor, you can define one or
more named thread pools-->
    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
        maxThreads="150" minSpareThreads="4"/>

    <!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
         Java HTTP Connector: /docs/config/http.html (blocking &
         Java AJP  Connector: /docs/config/ajp.html
         APR (HTTP/AJP) Connector: /docs/apr.html
         Define a non-SSL HTTP/1.1 Connector on port 8080
    <Connector port="8080" protocol="HTTP/1.1"
               redirectPort="8443" />
    <!-- A "Connector" using the shared thread pool-->
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1"
               redirectPort="8443" />
    <!-- Define a SSL HTTP/1.1 Connector on port 8443
         This connector uses the JSSE configuration, when using APR, the
         connector should be using the OpenSSL style configuration
         described in the APR documentation -->
    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8080" />

    <!-- An Engine represents the entry point (within Catalina) that
         every request.  The Engine implementation for Tomcat stand alone
         analyzes the HTTP headers included with the request, and passes
         on to the appropriate Host (virtual host).
         Documentation at /docs/config/engine.html -->

    <!-- You should set jvmRoute to support load-balancing via AJP ie :
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">

      <!--For clustering, please take a look at documentation at:
          /docs/cluster-howto.html  (simple how to)
          /docs/config/cluster.html (reference documentation) -->

      <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster">

        <Manager className="org.apache.catalina.ha.session.DeltaManager"



  <Channel className="">



          port="45564" frequency="500"





           address="auto" port="4000" autoBind="100"

           selectorTimeout="5000" maxThreads="6"/>




<Valve className="org.apache.catalina.ha.tcp.ReplicationValve" filter=""/>

<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>




      <!-- Use the LockOutRealm to prevent attempts to guess user passwords
           via a brute-force attack -->
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <!-- This Realm uses the UserDatabase configured in the global JNDI
             resources under the key "UserDatabase".  Any edits
             that are performed against this UserDatabase are immediately
             available for use by the Realm.  -->
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"

      <Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true">

        <!-- SingleSignOn valve, share authentication between web
             Documentation at: /docs/config/valve.html -->
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common"
        <Valve className="org.apache.catalina.valves.AccessLogValve"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />


John Rellis

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