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本地repo文件修改
http://mirrors.cloud.aliyuncs.com/centos/ 替换为http://mirrors.aliyun.com/centos
http://mirrors.aliyuncs.com/centos/ 替换为http://mirrors.aliyun.com/centos
下载下面的源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum update更新virt-what报错
yum -y install virt-what*
yum -y updatez
yum clean all
yum makecache