Fix RHEL 7/centos 7/fedora appears unit Iptables.service failed to load

has been used in CentOS 6 habit, a bit did not adapt to come over. Firewall configuration after performing service iptables save appears "Failed to restart Iptables.service:Unit iptables.service Failed to load:no such file or Directory. " Error, the firewall is managed by FIREWALLD in CentOS 7 or Rhel 7 or Fedora, and of course you can restore the traditional way of management. or use the new command to manage it.
If you use tradition, execute the command:

Systemctl Stop Firewalldsystemctl Mask firewalld

and install Iptables-services:

Yum Install Iptables-services

Set boot up:

systemctl Enable Iptablessystemctl [Stop|start| Restart] Iptables#orservice iptables [Stop|start|restart]

service iptables save#or/usr/libexec/iptables/iptables.init Save

Fix RHEL 7/centos 7/fedora appears unit Iptables.service failed to load