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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.3. MDT diagnosis and treatment decisions usually need to follow industry clinical guidelines;It happens that I like you too1968.07-太阳王子霍尔斯的大冒险For information on the new CA, please refer to the bottom of this website.In some first-tier cities, operators have to increase the number of 5G base stations while ensuring the operation of 4G base stations, which will increase the difficulty and financial pressure accordingly.就算有啥误会，说开了就没了。