Running Multiple Instances of Tomcat on same port

Question

I need to run multiple instances of tomcat6 under different directory names on the same port. I will install tomcat6 twice for two different projects. But how to configure both the instances to run on the same port?

Answer 1

You could realise this using an apache webserver that is directing the requests based on the application using mod_jk or mod_proxy. (and get an explanation on both extensions)

To choose which apache extension to use: apache to tomcat: mod_jk vs mod_proxy

Answer 2

Yes, you can. In server.xml replace:

<Host name="localhost"  appBase="webapps" unpackWARs="true" autoDeploy="true">
    <!-- SingleSignOn valve, share authentication between web applications
         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" directory="logs"
           prefix="localhost_access_log." suffix=".txt"
           pattern="%h %l %u %t &quot;%r&quot; %s %b" />
</Host>

By

<Host name="app1.com"  appBase="webappsApp1" unpackWARs="true" autoDeploy="true">

    <!-- SingleSignOn valve, share authentication between web applications
         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" directory="logs"
           prefix="localhost_access_log." suffix=".txt"
           pattern="%h %l %u %t &quot;%r&quot; %s %b" />
</Host>

<Host name="app2.com"  appBase="webappsApp2" unpackWARs="true" autoDeploy="true">

    <!-- SingleSignOn valve, share authentication between web applications
         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" directory="logs"
           prefix="localhost_access_log." suffix=".txt"
           pattern="%h %l %u %t &quot;%r&quot; %s %b" />
</Host>

In the webappsApp1 directory you put the war of App1, the same for webappsApp2 directory and App2.

In dns zone of App1 and App2 put the public ip of the server.