问题描述：

(base) [root@localhost yum.repos.d]# yum install -y https://repo.huaweicloud.com/centos-altarch/7/extras/aarch64/Packages/slirp4netns-0.4.3-4.el7_8.aarch64.rpm

Docker CE Stable - aarch64                                                                                                                              294  B/s | 385  B     00:01

Error: Failed to download metadata for repo 'docker-ce-stable': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

解决办法：

1、 vi docker-ce.repo，将releasever修改成7即可；

[docker-ce-stable]

name=Docker CE Stable - $basearch

baseurl=https://download.docker.com/linux/centos/7/$basearch/stable

enabled=1

gpgcheck=0

gpgkey=https://download.docker.com/linux/centos/gpg