Ubuntu20.4安装Docker

1.

sudo apt-get update

 2.

sudo apt-get install apt-transport-https ca-certificates software-properties-common curl

 3.

curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -

4.

sudo add-apt-repository "deb [arch=amd64] https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu \
$(lsb_release -cs) stable"

5.

sudo apt-get update

6.

sudo apt-get install docker-ce

输入：sudo docker info 查看安装信息

运行测试image hello-world 第一次运行 image 镜像不存在，自动从仓库下载hello-world镜像

sudo docker run hello-world

 7.更换镜像仓库为国内服务器

sudo gedit /etc/docker/daemon.json

 输入：以下内容 保存

{
    "registry-mirrors" : [
    "https://registry.docker-cn.com",
    "https://docker.mirrors.ustc.edu.cn",
    "http://hub-mirror.c.163.com",
    "https://cr.console.aliyun.com/"
  ]
}

systemctl daemon-reload

sudo systemctl restart docker

8.去除 docker sudo 前缀

sudo gpasswd -a ${USER} docker
sudo groupadd docker
sudo chmod a+rwx /var/run/docker.sock
sudo systemctl restart docker