老师，我安装的时候报错了，麻烦帮我看看是什么问题呢

[root@bigdata01 ~]# sh get-docker.sh 
# Executing docker install script, commit: 39040d838e8bcc48c23a0cc4117475dd15189976

DEPRECATION WARNING
    This Linux distribution (centos 7) reached end-of-life and is no longer supported by this script.
    No updates or security fixes will be released for this distribution, and users are recommended
    to upgrade to a currently maintained version of centos.

Press Ctrl+C now to abort this script, or wait for the installation to continue.
+ command_exists dnf5
+ command -v dnf5
+ command_exists dnf
+ command -v dnf
+ sh -c 'yum -y -q install yum-utils'
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=extras&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=updates&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"
http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
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/.

http://mirrors.ustc.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.jlu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 403 - Forbidden
Trying other mirror.
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/.

http://mirrors.nju.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.huaweicloud.com/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.tuna.tsinghua.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirror.lzu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.
http://mirrors.qlu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.bupt.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 403 - Forbidden
Trying other mirror.
http://mirrors.bfsu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed to connect to 2409:8700:2482:710::fe55:2840: Network is unreachable"
Trying other mirror.
http://ftp.sjtu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.ustc.edu.cn/centos/7.9.2009/updates/x86_64/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
http://mirrors.ustc.edu.cn/centos/7.9.2009/updates/x86_64/repodata/f19044932626155f0cd849e88972b84875fc85e3308b4d622844a911c4ef54d0-primary.sqlite.bz2: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/Packages/yum-utils-1.1.31-54.el7_8.noarch.rpm: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
+ sh -c 'yum config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo'
Loaded plugins: fastestmirror
Usage: yum [options] COMMAND