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If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.　　信跟妻子程美丽(伍咏薇)十多年的婚姻早已淡然无味；正跟许心言(邵美琪)的关系又合又分。巧合的是，言加入了丽的杂志社，成为她的下属，言为了紧贴警方的大小案件而拚尽了命，丽虽不能跟她正面竞争，但二人的暗斗却无可避免…The profit of the third scourge injury is 15%/(1-20% +10% +25% +30% +15% +15%) = 8.571% compared with only two scourge injuries.气氛一下由箭拔弩张变为无边的香艳刺激。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.2. Slowloris attack