I would restart Apache2 but there comes an Error
$ sudo service apache2 start Starting web server apache2 Action \'start\' failed. The Apache error log may hav
You have following ways to make it work:
Delete /var/run/apache2/apache2.pid then check if its working
You can disable SELinux and then check if it works. You can disable SELinux permanantly or temporarily by using https://linux4one.com/how-to-disable-selinux-on-centos-7/ tutorial