/etc/apache2/sites-available# cat domain1

NameVirtualHost 203.x.x.x
<VirtualHost 203.x.x.x>
ServerAdmin webmaster@localhost
ServerName www.domain1.com
DocumentRoot /var/www/dn1/
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www/dn1/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
# This directive allows us to have apache2's default start page
# in /apache2-default/, but still have / go to the right place
#RedirectMatch ^/$ /apache2-default/
</Directory>

ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>

ErrorLog /var/log/apache2/error.log

# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn

CustomLog /var/log/apache2/access.log combined
ServerSignature On

Alias /doc/ "/usr/share/doc/"
<Directory "/usr/share/doc/">
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
Allow from 127.0.0.0/255.0.0.0 ::1/128
</Directory>

</VirtualHost>

cd /var/www/dn1# ls
index.html

dns:/etc/apache2/sites-available# ls
default domain1

ln -s /etc/apache2/sites-available/domain1 /etc/apache2/sites-enabled/domain1.com

tail /var/log/apache2/error.log
[warn] NameVirtualHost 203.x.x.x. has no VirtualHosts