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It's hard work, and the technology is sticking to the top.Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.The story of entrepreneur Don Cornelius, who developed the Soul Train show, which rose to prominence in the 1970s.System form (referring to pipe network, no pipe network, combined distribution, independent type, high pressure, low pressure, etc.), number and location of protection areas protected by the system, location of manual control device, location between steel cylinders, type of extinguishing agent, and diagram of gas fire extinguishing system.《从海底出击》续订第二季。　　某天，汉娜前往苏格兰公干。在接下来的几个月里，汤姆保守孤独折磨，他意识到汉娜对自己的重要性，于是决定等她回来向其求婚。然而，汉娜在苏格兰