简述处理方法

进入 /etc/yum.repos.d 目录下，将所有有关 docker 的 repo 全部删掉

具体说明

当在执行 yum list docker-ce --showduplicates | sort -r 时，发现下面报错

[root@localhost yum.repos.d]# yum list docker-ce --showduplicates | sort -r
https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.pro/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
正在尝试其它镜像。
To address this issue please refer to the below wiki article 

https://wiki.centos.org/yum-errors

If above article doesn't help to resolve this issue please use https://bugs.centos.org/.



 One of the configured repositories failed (added from: https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.pro),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro
        or
            subscription-manager repos --disable=mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro.skip_if_unavailable=true

failure: repodata/repomd.xml from mirrors.aliyun.com_docker-ce_linux_centos_docker-ce.pro: [Errno 256] No more mirrors to try.
https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.pro/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
已加载插件：fastestmirror
 * updates: mirrors.aliyun.com
Loading mirror speeds from cached hostfile
 * extras: mirror01.idc.hinet.net
 * base: mirror.jdcloud.com```

报错原图：

处理办法

切换到 /etc/yum.repos.d 目录下，将所有 docker 相关的 repo全部删掉

删除之后查看

重新添加镜像

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo