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Comrades ask a shell question

Source: Internet
Author: User
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For more information about shell, see Linux general technology-Linux programming and kernel. At the beginning of today, I learned shell and haven't started to learn script programming. the teacher left an exercise and I am a little dizzy. I don't know where to start.
Exercise: The client accesses a server with iptables, DNAT, which is forwarded to the web server to be accessed by the client, if this web server fails, how can I use shell scripts to automatically switch access to another web server .... I don't know how to write this. thank you for your support ····

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