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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.在下怕姑娘不方便，所以特地在此等候，也是碰运气的意思。你送给葫芦的帽子，代表你的一份心，是有情义的。Know the principle + can change the model details man: read the paper, read the paper, read the paper! Read source code read source code read source code! The source code reading here is not limited to reading the source code of one framework. You can look at other excellent frameworks. For the implementation mechanism of the same layer and the same function, you can think more, summarize more and write more. After a long time, there will definitely be gains. The purpose of reading the paper is to directly obtain the original author's thoughts, avoiding obtaining second-hand thoughts from blog interpretation of the paper. After all, everyone's understanding is different, and it is not necessarily right. Read it first, then look at other understandings, and discuss with Daniel more, thus broadening the thinking.　　封店让所有人不明所以、惊恐万分。唯独曹雪反应异常，她愤怒地指责哥哥希文丧心病狂似的只顾报仇，甚至无视亲妹妹的安危……希文说可以借机打击应急大队并无比（洪金宝 饰）是巴塞罗那一间侦探社的打手，这天，他的侦探社接到了一单大生意：客人委托他们14天内找到一名叫歌利亚的女子和她的女儿施维亚。因为侦探社的社长侦探在外躲债，而无比又不想眼白白丢了一单生意，于是，他找来在当地经营快餐车的华人青年托马斯（成龙 饰）与大卫（元彪 饰）一起进行调查。