1-安装docker

docker官网：https://www.docker.com/

Ubuntu安装Docker步骤：
# 卸载旧版本
sudo apt-get remove docker docker-engine docker.io containerd runc
# 更新数据源
sudo apt-get update
# 安装所需依赖
sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common
# 安装 GPG 证书
sudo curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
# 新增数据源
sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
# 更新并安装 Docker CE
sudo apt-get update && sudo apt-get install -y docker-ce

#配置Docker镜像加速器：阿里云加速器
https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors

sudo mkdir -p /etc/docker

sudo tee /etc/docker/daemon.json <<-'EOF'
{
"registry-mirrors": ["https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors"]    
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

  ########"registry-mirrors": ["你的加速器地址"]