How to run different apps on single Tomcat instance behind different ports?

Currently I have 2 web applications app1 and app2 running on Tomcat 6:

app1 on http://localhost:8080/app1
app2 on http://localhost:8080/app2

I want to configure Tomcat so that they run in root context behind separate ports:

app1 on http://localhost:8081
app2 on http://localhost:8082

What needs to be done?

Solution

I think you can configure that in you server.xml file and put 2 services :

<Service name="app1">
   <Connector port="8081" protocol="org.apache.coyote.http11.Http11NioProtocol" 
           connectionTimeout="20000" 
           redirectPort="8443" />
   <Engine name="Catalina" defaultHost="localhost">
      <Host name="localhost"  appBase="app1"
        unpackWARs="true" autoDeploy="true">
      </Host>
   </Engine>
</Service>
<Service name="app2">
   <Connector port="8082" protocol="org.apache.coyote.http11.Http11NioProtocol" 
           connectionTimeout="20000" 
           redirectPort="8443" />
   <Engine name="Catalina" defaultHost="localhost">
      <Host name="localhost"  appBase="app2"
        unpackWARs="true" autoDeploy="true">
      </Host>
   </Engine>
</Service>