CentOS 7 appears Failed to start iptables.service: Unit iptables.service failed to load

The following error message:

service iptables start
Redirecting to /bin/systemctl start  iptables.service
Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory.
Solutions are as follows:
 Because centos7 default firewall is firewalld firewall management tool, rather than using iptables. So we need to shut down firewalld service, or use the default firewalld firewall.

(1) Close firewalld:

systemctl stop firewalld
systemctl mask firewalld

(2) use the iptables service:

1. Installation iptables-services:

yum install iptables-services

2. Set the boot:

systemctl enable iptables

3. iptables startup, shutdown, save:

systemctl [stop|start|restart] iptables
#or
service iptables [stop|start|restart]


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

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