Ubuntu20下载安装Docker

安装Docker

• 卸载旧版本

sudo apt-get remove docker /
               docker-engine /
               docker.io

• 使用apt安装

sudo apt-get update

sudo apt-get install /
    apt-transport-https /
    ca-certificates /
    curl /
    gnupg /
    lsb-release

• 添加软件源GPG秘钥

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

• 添加docker软件源

echo /
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://mirrors.aliyun.com/docker-ce/linux/ubuntu /
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

• 安装Docker

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

• 启动Docker

sudo systemctl enable docker
sudo systemctl start docker

• 建立用户组并将当前用户加入docker组

sudo groupadd docker #添加docker组
sudo usermod -aG docker $USER #将当前用户加入docker组

• 测试Docker是否安装正确

docker run --rm hello-world

重要：设置Docker镜像加速

• 查看是否为docker.service中配置过镜像地址

systemctl cat docker | grep '/-/-registry/-mirror'

• 具体配置如下：在/etc/docker/daemon.json中写入以下内容

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

• 重启服务

sudo systemctl daemon-reload
sudo systemctl restart docker

• 使用docker info查看加速器是否生效

Registry Mirrors:
 https://hub-mirror.c.163.com/

卸载Docker

sudo apt-get purge docker-ce docker-ce-cli containerd.io docker-compose-plugin
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd