If you're not too familiar with the Apache server or don't understand proxying very well, the apparently simple task of getting http://www.foo.com (i.e., your domain name) to point to your live lenya home page can be quite daunting. If you've just got a single server and only one publication, here's the easy way (for Lenya 1.2.5):
(n.b., Whether the URLS below have trailing slashes or not is significant).
Configuring Lenya
In $pub/config/publication.xconf, change the proxy elements so (obviously changing www.foo.com to your own domain name):
<!--
For information about these settings, read
http://lenya.apache.org/1_2_x/components/deployment/proxying.html
-->
<!--
<proxy area="live" ssl="true" url="https://www.foo.com/ssl/default"/>
-->
<proxy area="live" ssl="false" url="http://www.foo.com"/>
<!--
<proxy area="authoring" ssl="true" url="https://www.foo.com/lenya/default/authoring"/>
<proxy area="authoring" ssl="false" url="http://www.foo.com/lenya/default/authoring"/>
-->
Here we are only proxying the live pages. That is, the authoring pages will still be at http://www.foo.com:8080 (or whatever port you have Lenya on).
Restart Lenya
Configuring Apache
In your apache2.conf file, add the following at the end:
ProxyRequests Off ProxyPass /default/live/css http://www.foo.com/css ProxyPassReverse /default/live/css http://www.foo.com/css ProxyPass /default/live/images http://www.foo.com/images ProxyPassReverse /default/live/images http://www.foo.com/images ProxyPass / http://www.foo.com:8080/default/live/ ProxyPassReverse / http://www.foo.com:8080/default/live/
Restart Apache