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沐浴着冬日暖阳，用手揉搓着身下晒得干枯暖和的枯草，他觉得自己的心也如同这片草地一般，沉寂下来，却说不出的轻松，仿佛丢弃了所有。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.The biggest problem for programmers is "conceit". Especially when we review other people's codes, I have seen countless scenes. When programmers review codes, they begin to attack other people's codes and question other people's abilities. It's ridiculous. I analyzed it. This kind of programmer actually has no skill, because they accuse each other of trying to tell everyone how good they are. To show their programmers by this means is actually what the legend calls "half a bottle of water".花王，皮特，孙和莫克的故事的延续。2. It is to use a proxy class to call the original method and control the generated results. This method is the proxy mode.Set up position, quantity and fire emergency broadcasting system diagram.