AH00557: apache2: apr_sockaddr_info_get() failed for foo-bar

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Example error:

# service apache2 start
* Executing: /lib64/rc/sh/openrc-run.sh /lib64/rc/sh/openrc-run.sh /etc/init.d/apache2 start
* Starting apache2 ...
* Detaching to start `/usr/sbin/apache2' ...
AH00557: apache2: apr_sockaddr_info_get() failed for gentoo-victoria
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message
*   start-stop-daemon: failed to start `/usr/sbin/apache2'                                                                                             [ !! ]
* ERROR: apache2 failed to start

Solved by adding a line in hhtpd.conf as suggested:

# vi /etc/apache2/httpd.conf
ServerName localhost