Centos 提示 Error: Failed to download metadata for repo ‘appstream‘: Cannot prepare internal mirrorlist
ssh下执行
cd /etc/yum.repos.d/ & sed -i ‘s/mirrorlist/#mirrorlist/g’ /etc/yum.repos.d/CentOS-* & sed -i ‘s|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g’ /etc/yum.repos.d/CentOS-* & yum makecache & yum update -y
即可解决