mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
cd /etc/yum.repos.d/ wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
cd /etc/yum.repos.d/
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
yum clean all yum makecache
yum clean all
yum makecache
yum update
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