docker安装（乌班图）

一、卸载旧版本

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

二、首次安装，安装镜像仓库

    2.1 更新apt软件包索引

sudo apt-get update

    2.2 添加docker官方GPG秘钥

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

    2.3 配置仓库

vi /etc/apt/sources.list

deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
# deb-src [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

三、安装docker-ce

    3.1 更新版本

sudo apt-get update

    3.2 安装

        3.2.1 安装最新版本

sudo apt-get install docker-ce

        3.2.2 安装指定版本

sudo apt-get install docker-ce=<VERSION>

      》安装 17.03.2~ce-0~ubuntu-xenial 版本

sudo apt-get install docker-ce=17.03.2~ce-0~ubuntu-xenial

    可能出现的错误

    此问题源于libltdl7版本太低，ubuntu16.04默认无更高版本。

    下载：

wget http://launchpadlibrarian.net/236916213/libltdl7_2.4.6-0.1_amd64.deb

     安装：

sudo dpkg -i libltdl7_2.4.6-0.1_amd64.deb

 再次安装 =》 跳转3.1

四、测试安装

sudo docker run hello-world

就此安装成功！！！