1. List all services enabled/disabled on boot (ex chkconfig –list)
systemctl list-unit-files
2. Enable HTTPD + Mysql service on system boot:
systemctl enable httpd systemctl enable mariadb
3. Reverting to iptables from firewalld
systemctl stop firewalld systemctl mask firewalld yum install iptables-services systemctl enable iptables systemctl start iptables # to save iptables rules use service iptables save