CentOS 7 中安装iptables启动时Job for iptables.service failed because the control process exited with error

#安装iptables yum install iptables-services iptables -A INPUT -p tcp --dport 22 -j ACCEPTlinux iptables -A OUTPUT -p tcp --sport 3322 -j ACCEPTcurl   #重启防火墙使配置文件生效  systemctl restart iptables.servicetc
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