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Since both Redis servers are installed on the Linux operating system, and the two Redis servers will switch when the Master master server fails, it must be ensured that the port numbers of the two Redis servers have been added to the firewall, or the firewalls of the two Linux operating systems have been shut down, otherwise Master-link-Status: down will be prompted, and Master master server is not connected. There are two solutions: the first is to shut down the firewalls of the two Linux operating systems; The second method is to add the port number of each Redis service to the firewall to allow communication through the port number. You can use the command "firewall-cmd-query-port=6379/tcp" first. If the result is No, you can continue to execute the following command "firewall-cmd-add-port=6379/tcp". After the command is executed, you will return Success, indicating that the increase was successful. In this way, Redis servers on the two Linux systems can be switched smoothly to perform sentinel mode operations.DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.(can be superimposed)众人顿时兴致勃勃起来。午前3時のノック 工藤静香 橋爪　淳江湖上流传的假藏宝图正是江别鹤用来制造江湖纷争，铲除异己的手段。Star Trek: Enterprise(星际旅行:进取号) 是Star Trek 星际旅行系列的第5部电视连续剧. 由Rick Berman 和 Brannon Braga创作, 2001年开播。设定在22世纪, 剧情随着 Enterprise进取号的航程而展开, 第一艘能达到曲速5的地球星舰。这部电视剧在很多地方打破了常规，它是唯一一部以正常的角色分派贯穿整部剧而且未作过任何更改的"星际旅行"系列电视剧，也是第一部以HDTV格式拍摄替代传统的4:3格式的"星际旅行"系列电视剧，也是第一个从整个系列的开始到结束全部采用电脑成像技术来表现飞船，也是唯一一部有带歌词的片头主题曲的"星际旅行"系列电视剧。这部电视剧原先的标题只有Enterprise进取号; "Star Trek"星际旅行是在第3季"Extinction"这一集才被加上去的。拍了四季以后, 这个系列被UPN 在2005年2月2日终止了,