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作为一名强迫症晚期，阿里云、腾讯云系统装好后的主机名都是VM_200_111_centos ~这种样式，个人还是喜欢默认的localhost，但是老的办法修改/etc/sysconfig/network文件在Centos7中已经改变。
hostnamectl set-hostname localhost
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