Met a message when restarting the httpd service:
[root@www ~]# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using www.mydomain.com for ServerName
[ OK ]
It is a warning message from httpd for notifying you the server name have not been assigned explicitly in Apache, so the warning message can be resolved by indicating a fully qualified domain name (FQDN) in httpd.conf.
[root@www ~]# vi /etc/httpd/conf/httpd.conf
...
#ServerName www.example.com:80
Please remove the leading comment symbol "#" and replace the server name into yours.
ServerName www.mydomain.com:80
The parameter ServerName will take effect after a restart. Let's try to restart it again.
[root@www ~]# service httpd restart
Stopping httpd: [ OK ]
Starting httpd: [ OK ]
The warning message disappeared.