port to subdomain

I have installed Hudson using apt-get, and the Hudson server is available on example.com:8080.

For example.com I use standard port *:80 and some virtual hosts set up this way:

# /etc/apache2/sites-enabled/subdomain.example.com
<Virtualhost *:80>
  ServerName subdomain.example.com
  ...
</Virtualhost>

Here is info about Hudson process:

/usr/bin/daemon --name=hudson --inherit --env=HUDSON_HOME=/var/lib/hudson --output=/var/log/hudson/hudson.log --pidfile=/var/run/hudson/hudson.pid -- /usr/bin/java -jar /usr/share/hudson/hudson.war --webroot=/var/run/hudson/war
  987 ?        Sl     1:08 /usr/bin/java -jar /usr/share/hudson/hudson.war --webroot=/var/run/hudson/war

How should I forward:

    http:// example.com:8080  

to:

    http:// hudson.example.com

You'll need to enable mod_proxy in Apache2 first. So run these commands as root, or sudo:

a2enmod proxy
a2enmod proxy_http

You'll then need to restart apache:

/etc/init.d/apache2 restart

Your HUDSON vhost file:

<VirtualHost *:80>
ServerName hudson.example.com
ProxyPass         /  http://localhost:8080/hudson
ProxyPassReverse  /  http://localhost:8080/hudson
ProxyRequests     Off

# Local reverse proxy authorization override
# Most unix distribution deny proxy by default 
# (ie /etc/apache2/mods-enabled/proxy.conf in Ubuntu)
<Proxy http://localhost:8080/hudson*>
  Order deny,allow
  Allow from all
</Proxy>
</VirtualHost>

Restart Apache one more time to commit the new vhost:

/etc/init.d/apache2 restart

• Hudson Documention on running it behind Apache: LINK
• Apache2.2 doc on running ProxyPass subdomains: LINK