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Apache Starting httpd: apr_sockaddr_info_get() failed

When I install apache in CentOS nowadays, I get a warning "Starting httpd: httpd: apr_sockaddr_info_get() failed for myservername, httpd: Could not reliably determine the server's fully qualified domain name, using for ServerName" when I start httpd servers. It seems my website and apache server are all normal without any problems. When I look up this issue in Google, the result is that ServerName is not consistent with CentOS.

1. Default ServerName Settings

This tips about ServerName are copied from httpd/conf/httpd.conf :

# ServerName gives the name and port that the server uses to identify itself.
# This can often be determined automatically, but we recommend you specify
# it explicitly to prevent problems during startup.
# If this is not set to valid DNS name for your host, server-generated
# redirections will not work.  See also the UseCanonicalName directive.
# If your host doesn't have a registered DNS name, enter its IP address here.
# You will have to access it by its address anyway, and this will make
# redirections work in a sensible way.

ServerNames in /etc/hosts :   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

ServerName in /etc/sysconfig/network


2. Fix httpd: apr_sockaddr_info_get() failed

There are two methods for fixing, choise one as you prefered.

Only modify /etc/host

Add myservername declaration in the end of /etc/hosts :   localhost localhost.localdomain localhost4 localhost4.localdomain4 myservername
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

Only modify httpd.conf

ServerName myservername:80

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