失败了好多次，终于发现忘了看仔细看书，QAQ，果然：Festinatione facit vastum. 溯回传送门
问题描述：
Failed to connect to the database: could not connect to server: Connection refused Is the server running on host xxxxxxxx.
解决方法：
在msf终端输入命令：
service postgresql start
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