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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.In the communication with the team members, Mr. Sun Yimin knew that most of the team members had entered the laboratory to help their instructors improve the subject. After understanding the research topic, he encouraged the team members to think differently and not to stick to books and documents.然而，香荽和王穷并未被她吸引注意，他们都沉浸在对话中。20 世纪50 年代，一位家庭主妇前往里约热内卢见她的丈夫，却得知他已抛弃了自己。但她仍决定留在那儿，并开了一个波萨诺瓦俱乐部。Other requirements for kindergarten teacher qualification certificate:魏铜忙上前见礼。Two interfaces: