更换yum的源为阿里云或者网易

1.备份本来的yum源：缓存 #mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup测试 2.下载阿里云的yum源：阿里云 CentOS6,CentOS7,CentOS8下对应的便可blog wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirr

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