又到了centos7不在支持的时候了，和centos6类 得改源
错误提示：
Could not retrieve mirrorlist http://mirrorlist.centos.org /?release=7&arch=aarch64&repo=os&infra=stock error was14:curl#6 -"Could not resolve host: mirrorlist.centos.
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又到了centos7不在支持的时候了，和centos6类 得改源
错误提示：
Could not retrieve mirrorlist http://mirrorlist.centos.org /?release=7&arch=aarch64&repo=os&infra=stock error was14:curl#6 -"Could not resolve host: mirrorlist.centos.
