If you need to disable firewalld and use iptables in server use the following steps.

First, stop and mask the firewalld service:

systemctl stop firewalld
systemctl mask firewalld

Next, install the iptables-services package and enable the service to start at boot:

yum install iptables-services
systemctl enable iptables

Then, saving the firewall rules can be done using either of the following two commands:

service iptables save
/usr/libexec/iptables/iptables.init save

• IPtables