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+save iptables in CentOS7:
+
+disable firewalld daemon:
+
+# systemctl disable firewalld
+
+Then install iptables-service by following command:
+
+# yum install iptables-services
+
+Then enable iptables as services:
+
+# systemctl enable iptables
+
+Now you can save your iptable rules by following command:
+
+# service iptables save