http://opencms-wiki.org/MultiSite_configuration_instructions
STEP I:
Find the section of opencms-system.xml that looks like:
<sites>
<workplace-server>http://www.mysite.com:8080</workplace-server>
<default-uri>/sites/default/</default-uri>
<site server="www.mysite.com" uri="/sites/default/"/>
</sites>
and add another site definition as follows:
<site server="www.mynewsite.com" uri="/sites/MyNewSite/"/>
STEP II:
In order for Tomcat to correctly route web requests to the correct site in OpenCms, we need to modify the server.xml configuration file, located in <tomcatroot>/conf.
Find the section of server.xml that looks like:
<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />
and add another connector definition as follows:
<Connector port="8081" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
proxyName="www.mynewsite.com" proxyPort="80"
connectionTimeout="20000" disableUploadTimeout="true" />