I tried to restart my Apache server on CentOS 5.0 and got this message:
httpd: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1 for ServerName
Here is the /etc/hosts file:
127.0.0.1 server4-245 server4-245.com localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6
Here is the /etc/sysconfig/network file:
NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=server4-245
I also have this in the Apache httpd.conf file:
ServerName localhost
However, I still get the first error message when I restart Apache.
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Answer
Your hosts file does not include a valid FQDN, nor is localhost an FQDN. An FQDN must include a hostname part, as well as a domain name part. For example, the following is a valid FQDN:
host.server4-245.com
Choose an FQDN and include it both in your /etc/hosts file on both the IPv4 and IPv6 addresses you are using (in your case, localhost or 127.0.0.1), and change your ServerName in your httpd configuration to match.
/etc/hosts:
127.0.0.1 localhost.localdomain localhost host.server4-245.com ::1 localhost.localdomain localhost host.server4-245.com
httpd.conf:
ServerName host.server4-245.com