Unable to determine local hostname -falling back to "localhost"
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hadoop2.6.5伪分布式安装的时候，报错：Unable to determine local hostname -falling back to "localhost"，
由于更改了虚拟机的hostname
vi /etc/sysconfig/network
而/etc/hosts 下的文件没有修改
解决方法
vi /etc/hosts
添加红框里面的内容： ip 后面跟上虚拟机名，虚拟机名称和上图一样
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