1. 安装步骤

步骤一：官网下载 docker 安装包

wget https://download.docker.com/linux/static/stable/x86_64/docker-20.10.0.tgz

步骤二：解压安装包;

tar -zxvf docker-20.10.0.tgz

  步骤三：将解压之后的docker文件移到 /usr/bin目录下;

cd /home/zhy/soft/docker-20.10.0
sudo cp docker/* /usr/bin/

步骤四：将docker注册成系统服务;

sudo gedit /etc/systemd/system/docker.service

然后在文件中添加以下内容，退出并保存。

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

步骤五：给文件增加可执行权限

chmod +x /etc/systemd/system/docker.service
systemctl daemon-reload

步骤六：设置开机自启动

systemctl enable docker.service

步骤七 ：启动docker

systemctl start docker

步骤八：测试docker是否启动

docker --version 
sudo docker run hello-world

2. 卸载步骤

步骤一：停止docker

sudo systemctl stop docker

步骤二：删除Docker服务

# 移除开机自启动
systemctl disable docker.service
# 删除service服务
rm -f /etc/systemd/system/docker.service

步骤三：删除Docker相关命令

rm -f /usr/bin/docker*
rm -f /usr/bin/containerd*
rm -f /usr/bin/ctr
rm -f /usr/bin/runc

步骤四：删除docker目录和容器相关文件

sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd

步骤五：验证是否已成功卸载

docker --version

3. 问题描述

按照官网安装完Docker，在最后一步检验docker是否安装成功，即运行sudo docker run hello-world这条命令时一直一直一直出现以下问题：

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
c1ec31eb5944: Retrying in 1 second 
docker: error pulling image configuration: download failed after attempts=6: dial tcp 162.125.82.7:443: connect: connection refused.
See 'docker run --help'.

1. 解决方法：参考解决docker拉取镜像报错，Error response from daemon: Get "[https://registry-1.docker.io/v2/":](https://registry-1.docker.io/v2/":) net（亲测有效） - 相遇就是有缘 - 博客园

sudo gedit /etc/docker/daemon.json

然后在文件中插入如下内容：

{"registry-mirrors": [
    "https://dockerpull.org",
    "https://docker.unsee.tech/",
    "https://docker.1panel.live/",
    "https://docker.udayun.com/",
    "https://docker.nastool.de/"
  ]
  }

2、重启Docker服务

sudo systemctl daemon-reload

sudo systemctl restart docker

3、重新运行hello-world