Hello
hope you fine...
 
I'm sorry I'm asking to much but i didn't found any answer in her or Google (because im noob ) 
i was checking if mod_rewrite working and i found this 
[root@server~]#  /usr/local/apache/bin/httpd -M|grep rewrite
AH00558: httpd: Could not reliably determine the server's fully qualified domain           
name, using  MY.SERVER.NAME. Set the 'ServerName' directive globally to suppress             
 this message
 rewrite_module (shared)
then i wrote 
 systemctl status httpd 
and i found this line 
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using MY.SERVER.NAME. Set the 'ServerName' directive globally to suppress this message
apache works fine only this line ... 
is this normal? how to fix it if it's not normal 
Regards