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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.1. Os.name--Determine which platform is currently in use, Windows returns'nt '; Linux returns'posix'墨西哥裔美国少女瓦尔·加西亚是半人半吸血鬼，她不得不对自己的身份保密。但是当她人类最好的朋友出现在她怪物出没的学校时，她不得不面对她的真相，她的身份，和她自己。　　影片改编自詹姆斯·达什纳撰写的同名反乌托邦科幻小说三部曲的第二部。Heavenly chosen person: above level 45, wild ball boxing [skill damage] +70%.第二日一早，两兄弟起床，因家里没有多少下人，再者他们也是自立惯了的，各自洗漱完毕后，葫芦问板栗道：板栗，你瞧我是不是比以前老多了？板栗听了这话，差点笑出声来，知道葫芦哥哥是因为淼淼要来了，因而对自己的仪容紧张起来。