Tomcat – Multiple Tomcat Instances

apache-2.2javaload balancingtomcat

I have One Staic IP on one Server which is publically accessible over the Internet. I am running an Apache WebServer on that Server.

How can I make – 3 Web Applications (On Tomcat) running on 3 different intranet PC's – available over the Internet – using the one Publically accessible IP that I have?.

It should be noted that the Static-IP Server Machine can has two network adapters and can definitely access the intranet PC's too.

Please advise the best method to solve this problem. Thanks much.

Best Answer

My tomcat virtual hosts settings:

first enable mod_jk for apache:

a2enmod mod_jk

then restart apache

cat /etc/apache2/sites-enabled/tomcat:

NameVirtualHost *:80

    <VirtualHost *:80>
 DocumentRoot /usr/share/tomcat5.5/webapps/mydomain1.com
 ServerName mydomain1.com
 JkMount /* mydomain1
 ErrorLog /usr/share/tomcat5.5/logs/mydomain1.com-error_log
 CustomLog "|/usr/sbin/rotatelogs -l /usr/share/tomcat5.5/logs/mydomain1.com-access-%Y-%m-%d.log 86400" combined
</VirtualHost>

<VirtualHost *:80>
 DocumentRoot /usr/share/tomcat5.5/webapps/mydomain2.com
 ServerName mydomain2.com
 JkMount /* mydomain2
 ErrorLog /usr/share/tomcat5.5/logs/mydomain2.com-error_log
 CustomLog "|/usr/sbin/rotatelogs -l /usr/share/tomcat5.5/logs/mydomain2.com-access-%Y-%m-%d.log 86400" combined
</VirtualHost>

cat /etc/apache2/workers.properties

workers.tomcat_home=/usr/share/tomcat5.5/
workers.java_home=/usr/lib/jvm/java-6-sun
ps=/
worker.list=mydomain1, mydomain2

worker.lic.type=ajp13
worker.lic.host=mydomain1.com
worker.lic.port=8009
worker.lic.lbfactor=1

worker.wideok.type=ajp13
worker.wideok.host=mydomain2.com
worker.wideok.port=8009
worker.wideok.lbfactor=1

cat /usr/share/tomcat5.5/conf/server.xml

<Server port="8005" shutdown="SHUTDOWN">

  <Listener className="org.apache.catalina.core.AprLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>
  <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
  <GlobalNamingResources>
    <Environment name="simpleValue" type="java.lang.Integer" value="30"/>
    <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" maxHttpHeaderSize="8192"
               maxThreads="150000" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="3600000" disableUploadTimeout="true" />


    <Connector port="8443" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" disableUploadTimeout="true"
               acceptCount="100" scheme="https" secure="true"
               clientAuth="false" SSLEnabled="true"
               keystoreFile="/usr/share/tomcat5.5/webapps/somedomain.com/ROOT/WEB-INF/ssl/sms_ssl.key" keystorePass="changeit"
            sslProtocol="SSL" />

 <Connector port="8009" 
     enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

<Engine name="Catalina" defaultHost="localhost">
 <Listener className="org.apache.jk.config.ApacheConfig"
    modJk="/usr/lib/apache2/modules/mod_jk.so"
    workersConfig="/etc/apache2/workers.properties"/>

<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
             resourceName="UserDatabase"/>

 <Host name="localhost" appBase="webapps"
       unpackWARs="true" autoDeploy="true"
       xmlValidation="false" xmlNamespaceAware="false">
 </Host>

 <Host name="mydomain1.com"
    appBase="/usr/share/tomcat5.5/webapps/mydomain1.com"
    unpackWARs="true"
    autoDeploy="true"
    xmlValidation="false"
    xmlNamespaceAware="false">
 </Host>

 <Host name="mydomain2.com"
    appBase="/usr/share/tomcat5.5/webapps/mydomain2.com"
    unpackWARs="true"
    autoDeploy="true"
    xmlValidation="false"
    xmlNamespaceAware="false">
 </Host>

</Engine></Service></Server>

and dir structure for /usr/share/tomcat5.5/webapps

/usr/share/tomcat5.5/webapps/
                             ROOT/WEB-INF
                             ROOT/index.jsp

/usr/share/tomcat5.5/webapps/mydomain1.com/
                                          ROOT/WEB-INF
                                          ROOT/index.jsp

/usr/share/tomcat5.5/webapps/mydomain2.com/
                                          ROOT/WEB-INF
                                          ROOT/index.jsp

Hope that helps :)

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