在Ubuntu 14.04.5 LTS 安装最新版 docker

a2005147

　　1.检查系统内核版本，至少高于3.10.
root@ubuntu02:~# uname -r
4.4.0-31-generic
　　root@ubuntu02:~# cat /proc/version
Linux version 4.4.0-31-generic (buildd@lgw01-43) (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016
　　2.检查ubuntu具体版本.
root@ubuntu02:~# cat /etc/issue
Ubuntu 14.04.5 LTS \n \l
　　3.安装额外依赖包，是为了docker可以使用aufs存储功能，实践上系统已经默认安装了。
root@ubuntu02:~# apt-get install  -y linux-image-extra-$(uname -r)
Reading package lists... Done
Building dependency tree
Reading state information... Done
linux-image-extra-4.4.0-31-generic is already the newest version.
linux-image-extra-4.4.0-31-generic set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@ubuntu02:~#
　　4.安装https协议源，实践上系统已经默认安装了.
root@ubuntu02:~# apt-get install -y apt-transport-https
Reading package lists... Done
Building dependency tree
Reading state information... Done
apt-transport-https is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
　　5.查看系统当前代号，其实这个无关紧要。
root@ubuntu02:~# lsb_release -c
Codename:       trusty
root@ubuntu02:~#

　　6.添加docker 官方yum源。
root@ubuntu02:/etc/apt/sources.list.d# vi docker.listroot@ubuntu02:/etc/apt/sources.list.d#br/>"centos@sha256:3b1a65e9a05f0a77b5e8a698d3359459904c2a354dc3b25ae2e2f5c95f0b3667"