httpd: Could not reliably determine the server‘s fully qualified domain name, using localhost.

Error:

localhost.localdomain httpd[15253]: AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message

Solution:

1、临时关闭：输入命令setenforce 0，重启系统后还会开启。
2、永久关闭：输入命令vi /etc/selinux/config，将SELINUX=enforcing改为SELINUX=disabled，然后保存退出。

然后再次访问IP前端界面就可以访问到了。