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Apache: [warn] _default_ VirtualHost overlap on port 80, the first has precedence Error and Solution

Question: I'm using Apache 2 to host multiple site on a single host using Apache name based VirtualHost feature. However, Apache is displaying lots of warning as follows:

Mã:Performing sanity check on apache22 configuration:
[Portal Oct 05 06:59:34 2008] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
[Portal Oct 05 06:59:34 2008] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
[Portal Oct 05 06:59:34 2008] [warn] NameVirtualHost 81.aaa.www.yyy:80 has no VirtualHosts
Syntax OK
Stopping apache22.
Waiting for PIDS: 14968.
Syntax OK
Starting apache22.
[Portal Oct 05 06:59:36 2008] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
[Portal Oct 05 06:59:36 2008] [warn] _default_ VirtualHost overlap on port 80, the first has precedence
[Portal Oct 05 06:59:36 2008] [warn] NameVirtualHost 81.aaa.www.yyy:80 has no VirtualHosts

How do I fix this warning and host multiple websites under UNIX / Linux Apache 2 webserver?

Answer: The NameVirtualHost directive is a required to configure name-based virtual hosts. Add this to your httpd.conf file to fix this issue. Open httpd.conf file:
Mã:# vi /etc/httpd/conf/httpd.conf

Add NameVirtualHost as follows:
Mã:NameVirtualHost *:80

OR add server IP:
Mã:NameVirtualHost 202.54.1.1:80

Save and close the file. Restart httpd web server under RHEL / Red Hat / Fedora / CentOS Linux:
Mã:# service httpd restart

OR type the following to restart Apache 2 under Debian / Ubuntu Linux:

Sample Apache 2 Virtual hosting configuration:

If you want to maintain multiple domains/hostnames on your machine you can setup VirtualHost containers for them. Most configurations use only name-based virtual hosts so the server doesn't need to worry about IP addresses. This is indicated by the asterisks in the directives below.

Mã:# My Virtual Hosts Config File for Two Domains

NameVirtualHost *:80
 
<VirtualHost *:80>
    ServerAdmin webmaster@theos.in
    DocumentRoot "/usr/local/docs/theos.in"
    ServerName www.theos.in
    ServerAlias theos.in
    ErrorLog "/var/log/theos.in-error_log"
    CustomLog "/var/log/theos.in-access_log" common
</VirtualHost>
 
<VirtualHost *:80>
    ServerAdmin webmaster@nixcraft.com
    DocumentRoot "/usr/local/docs/nixcraft.com"
    ServerName www.nixcraft.com
    ServerAlias nixcraft.com
    ErrorLog "/var/log/nixcraft.com-error_log"
    CustomLog "/var/log/nixcraft.com-access_log" common
</VirtualHost>

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