1、进入 /etc/yum.repos.d 目录下，将所有有关 docker 的 repo 全部删掉
2、重新添加镜像
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
docker安装报错failure: repodata/repomd.xml from mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro
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centos7 修改yum源 failure: repodata/repomd.xml from mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.rep: [Errno 25
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