docker官方源无法使用的解决办法

使用官方源

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

安装docker报错

Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
Trying other mirror.
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
Trying other mirror.
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
Trying other mirror.
^Chttps://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#56 - "Callback aborted"
Trying other mirror.

 One of the configured repositories failed (Docker CE Stable - x86_64),
 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=docker-ce-stable ...

     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 docker-ce-stable
        or
            subscription-manager repos --disable=docker-ce-stable

     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=docker-ce-stable.skip_if_unavailable=true

failure: repodata/repomd.xml from docker-ce-stable: [Errno 256] No more mirrors to try.
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2a03:2880:f10d:83:face:b00c:0:25de: Network is unreachable"
https://download.docker.com/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#56 - "Callback aborted"

这个问题可能是由于Docker官方源的问题，可以尝试更换其他的Docker源。以下是一些常用的Docker源：

1. 阿里云：docker-ce-linux-centos-7.9-x86_64-stable
2. 网易：http://hub-mirror.c.163.com/docker-ce/linux/centos/7.9/x86_64/stable/
3. 中国科技大学：https://mirrors.ustc.edu.cn/docker-ce/linux/centos/7.9/x86_64/stable/

选择一个合适的源，修改yum源配置文件

1. 打开或创建yum源配置文件，路径为/etc/yum.repos.d/docker-ce.repo
2. 将以下内容复制到文件中（以阿里云为例）：

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/7.9/x86_64/stable
enabled=1
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg

保存文件并退出，清除缓存并重新尝试安装Docker：

sudo yum clean all
sudo yum install docker-ce