ubuntu18.4安装docker

###　== 说明!!!我的ubuntu用的root登录如果执行失败加上ｓｕｄｏ ==

step 1 ,查看ubuntu版本

		uname -a

step 2,更新

	sudo apt update

step 3,

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

step 4,

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

step ５,

	 /etc/apt/sources.list.d
	 vi docker.list
	 #粘贴　deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable　　
	 保存退出

step ６, !!!很重要

	sudo apt-get update

step 8,安装docker

	 sudo apt install docker-ce

step 9,启动

	systemctl   start docker

step 10,测试

	docker run hello-world