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

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 Firewalld

Systemctl Mask Firewalld

　　and install Iptables-services:

　　　　Yum Install Iptables-services

　　Set boot up:

　　　　Systemctl Enable Iptables

　　　　Systemctl [Stop|start|restart|reload] iptables(separate execution)

　　Save Settings:

Service iptables Save or /usr/libexec/iptables/iptables.init save
　　　　

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