With RHEL 7 / CentOS 7,firewalld was introduced to manage iptables. IMHO,firewalld is more suited for workstations than for server environments.
It is possible to go back to a more classic iptables setup. First,stop and mask the firewalld service:
systemctl stop firewalld
systemctl mask firewalld
Then,install the iptables-services package:
yum install iptables-services
Enable the service at boot-time:
systemctl enable iptables
Managing the service
systemctl [stop|start|restart] iptables
Saving your firewall rules can be done as follows:
service iptables save
or
/usr/libexec/iptables/iptables.init save
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