httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

Overview

When restarting Apache, an error message like the following is displayed.

• Note: Apache itself restarts without any problems.

service httpd restart

httpd を停止中:                                            [  OK  ]
httpd を起動中: httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
                                                           [  OK  ]

It means that the FQDN, which uses 127.0.0.1 for ServerName, cannot be reliably determined.

Cause

The host name configured for “127.0.0.1” in /etc/hosts is not defined in the Apache configuration file.

hogehost is not configured in the Apache configuration file.

127.0.0.1      hogehost localhost.localdomain localhost

/etc/httpd/conf/httpd.conf

#ServerName www.example.com:80
ServerName hogehost:80