docker官方源无法利用的解决办法
利用官方源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: 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: 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: 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: 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: 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: 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: curl#56 - "Callback aborted"
Trying other mirror.
.....................
failure: repodata/repomd.xml from docker-ce-stable: No more mirrors to try.
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: 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：
[*]阿里云：https://mirrors.aliyun.com/docker-ce/linux/centos/7.9/x86_64/stable/
[*]网易：http://hub-mirror.c.163.com/docker-ce/linux/centos/7.9/x86_64/stable/
[*]中国科技大学：https://mirrors.ustc.edu.cn/docker-ce/linux/centos/7.9/x86_64/stable/
选择一个符合的源，修改yum源配置文件
[*]打开或创建yum源配置文件，路径为/etc/yum.repos.d/docker-ce.repo
[*]将以下内容复制到文件中（以阿里云为例）：
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
相关保举：
构建JDK1.8 centos7.9镜像-CSDN博客
docker和虚拟机的异同-CSDN博客
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