1、進入 /etc/yum.repos.d 目錄下，將所有有關 docker 的 repo 全部刪掉
2、重新添加鏡像
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
docker安裝報錯failure: repodata/repomd.xml from mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro
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Centos7系統使用yum遇到的問題failure: repodata/repomd.xml from base: [Errno 256] No more mirrors to try.
failure: repodata/repomd.xml from *: [Errno 256] No more mirrors to try.
安裝docker報錯：https://download.docker.com/linux/centos/7/i386/stable/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.cloud.aliyuncs.com; Unknown error" Trying other mirror.問題解決
安裝時遇到：正在嘗試其它鏡像。 http://mirrors.btte.net/centos/7.2.1511/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.btte.net; 未知的錯誤"
yum的/repodata/repomd.xml的錯誤淺析
centos 7 yum安裝失敗（出現repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found）的解決方法
yum 報錯 [Errno 14] Could not open/read file:///media/iso/repodata/repomd.xml
yum install 報錯[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
yum install 報錯[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml