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你试验品当的少了？季木霖：……鸡鸭鱼肉肯定样样有，可以吧？徐风悄悄地在心里翻个白眼。据参战的我军骑兵讲，越国骑兵用到的更多的动作是砍，这和剑的使用特点有差别。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.ColorDodge12年9月90日（星期四）TcpMaxHalfOpen represents the maximum number of half connections that can be processed simultaneously. If this value is exceeded, the system is considered to be under SYN attack. The default value for Win2000 server is 100 and for Win2000 Advanced server is 500.