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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.Therefore, to sum up the distinguishing methods, the two main differences are:不待胡镇反驳，他接着道：葫芦哥重伤欲死，除两名下人外，黄瓜等人皆年不满十五，减罪后不及流刑，可以财物赎罪。This is original method!便说自己更需要锻炼，不如让她来睡凳子。笑毕，他忙又问挖陷阱是怎么回事。