运行Hadoop时出现了：

导致运行失败。仔细分析后发现，这是因为以前192.168.1.201的主机名为master，后来把192.168.1.202改名为master，由于两台主机的公钥不一样，所以提示DNS欺骗(网络中有主机冒充master)，或者master的IP地址和公钥同时改变了。

解决的办法是将/home/${username}/.ssh/known_hosts中master的公钥删除掉就正常了。

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