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? After the 2008 financial crisis, the United States is facing great pressure from economic recession and rising unemployment, and urgently needs to change its development momentum. At the same time, the deindustrialization and emphasis on service industry in the past 20 years have led to a decline in the international competitiveness of the U.S. Economy, and it is urgent to upgrade the industrial system. Under this background, the then Obama administration put forward a re-industrialization strategy to optimize the domestic investment environment and attract the return of domestic manufacturing industry and foreign direct investment. In the current round of re-industrialization in the United States, the industrial Internet advocated by GE and other large multinational enterprises has become a typical representative.Test:Http://baike.baidu.com/view/1306799.htmSince 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.　　各社との争奪戦の末に映画化権を勝ち取った東映が贈る渾身の作品に、どうぞご期待ください！Four, subjective offline and objective offlineCombination mode is sometimes called part-whole mode. It is more convenient to deal with problems like tree structure. Look at the diagram: