[lug] ifconfig/apache -- 2 ips, 2 domain names

Michael Belanger mrb at ciclops.org
Tue Oct 18 09:13:34 MDT 2005

David Owen Kritzberg wrote:

> It didn't occur to me that I should alias the new url, and just have
> ITS provide the DNS service for this.  Then, I think, I would have
> just had to configure Apache for the alias.

This is what you want.
have ITS give you a CNAME entry in DNS that has the hostname (dijon?) pointing 
to your current IP address (or hostname)

Then you set up a virtual host on your apache config -- catching that hostname.

<VirtualHost *:80>
   ServerName bike.colorado.edu
   DocumentRoot /var/www/html/bike/htdocs/
   ErrorLog /var/log/httpd/error_log
   CustomLog /var/log/httpd/access_log combined

<VirtualHost *:80>
   ServerName dijon.colorado.edu
   DocumentRoot /var/www/html/dijon/htdocs/
   ErrorLog /var/log/httpd/error_log
   CustomLog /var/log/httpd/access_log combined

  <Directory "/var/www/html/dijon/htdocs/">
    Options -Indexes Includes FollowSymLinks MultiViews ExecCGI
    Order allow,deny
    Allow from all

<Directory "/var/www/html/bike/htdocs/">
    Options -Indexes Includes FollowSymLinks MultiViews ExecCGI
    Order allow,deny
    Allow from all

> Instead, I asked for the url and a separate IP to go along with that.
> Now I am under the impression that, although there is nothing wrong
> with this, it will require more work or more knowledge on my part.
> This is in short supply!

A seperate IP is not the answer and is CERTAINLY more trouble.
1.  You need to configure your server (another nic or eth0:1 type config) so 
that your host is accepting connections for that IP.

2.  You will then need to configure apache with an IP-based setup (with the new 

3.  Firewall configuration for your interfaces may get complicated.

> Right now I have an IP tied to dijon.colorado.edu.  HTTP requests to
> dijon look in /var/www/html/.  Now the IT people have set up DNS to
> connect a new, different ip number to a new name, bike.colorado.edu.
> I would like requests to bike.colorado.edu/ to point to
> /var/www/html/bike/.  I don't have the ifconfig set up properly.
> Actually it isn't set up at all.  Can anyone show or point me to an
> example of what I should write in /etc/rc.d/rc.local/, or provide me
> with a name for this kind of configuration, if it has a special name? 

rc.local?  What?  Just do the CNAME and virtual host entrys (along with the 
associated <DIRECTORY> entries.

> Thanks in advance,
> Dave
> --------------------------------
> Dave Kritzberg
> University of Colorado Economics
> david.kritzberg at colorado.edu
> http://dijon.colorado.edu/
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Michael Belanger
CICLOPS, Space Science Institute

phone. 720-974-5853   Jabber: mrb at jabber.ciclops.org
fax.   720-974-5860

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