一、下载docker

1. 配置apt代理

sudo gedit /etc/apt/apt.conf.d/proxy.conf
//文件内容
Acquire::https::Proxy "http://127.0.0.1:7890/";
Acquire::http::Proxy "http://127.0.0.1:7890/";

 2.（可选，第一第二步选一即可）临时窗口代理(只影响当前终端)

    export http_proxy=http://127.0.0.1:7890
    export https_proxy=http://127.0.0.1:7890

 3.更新包管理器

sudo apt update

 4. 导入gpg key

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

5.添加apt源（源添加到了'/etc/apt/sources.list.d'，不需要了可以删除） 

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb\_release -cs) stable"

 6.下载docker，docker compose

sudo apt update
sudo apt install docker-ce docker-ce-cli containerd.io docker-compose-plugin

7.包成功的

docker --version
docker compose version

 二、docker pull 失败

1.创建docker代理目录

sudo mkdir -p /etc/systemd/system/docker.service.d

2.配置docker代理

sudo gedit /etc/systemd/system/docker.service.d/proxy.conf
//文件内容
[Service]
Environment="HTTP_PROXY=http://127.0.0.1:7890"
Environment="HTTPS_PROXY=http://127.0.0.1:7890"
Environment="NO_PROXY=localhost,127.0.0.1"

 3.重启docker

sudo systemctl daemon-reload 
sudo systemctl restart docker

4.sudo docker pull包成功的