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Prevent this from pointing to global objectsDutch students in Amsterdam accidentally open a portal to a demonic world from the Dutch Golden Age.龙且很快发现，虽然楚军拼杀的很厉害，甚至比汉军还要厉害一些，但是终究人数太少，自己身边不过堪堪千人。北京城发生了翻天覆地的变化。每个人都像是浴火重生一样，眼中充满的希望。小葱摇头，轻声道：不对劲。刘氏忙点头说是，婆媳又闲话几句，待郑老爷子父子回来后，一家人方才去吃饭。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.