报错信息

<code>Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was

14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"

错误原因：mirrorlist.centos.org 不再被支持

解决方法：

sudo sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo

sudo sed -i s/^#.*baseurl=http/baseurl=https/g /etc/yum.repos.d/*.repo

sudo sed -i s/^mirrorlist=http/#mirrorlist=https/g /etc/yum.repos.d/*.repo

Running yum upgrade -y 如果：

failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.

http://vault.centos.org/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 301 - Moved Permanently

 解决：

sudo echo "sslverify=false" >> /etc/yum.conf

更多信息详见：

mirrorlist.centos.org no longer resolve? - Server Fault