Ubuntu 安装docker
本次操作仅限于 Ubuntu14.04 LTS查看内核版本：
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dpkg -l|grep linux-image
linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
linux-image-extra-3.13.0-83-generic 3.13.0-83.127 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP
包含extra的内核 才是能使用docker的
检查自己的机器内核，并进行替换 reboot
uname -r
安装docker
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$ apt-get update
$ apt-get install apt-transport-https ca-certificates
sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
创建 /etc/apt/sources.list.d/docker.list
添加：
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deb https://apt.dockerproject.org/repo ubuntu-trusty main
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apt-get update
卸载旧版本docker
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apt-get purge lxc-docker
apt-cache policy docker-engine
apt-get update
sudo apt-get install linux-image-extra-$(uname -r)
reboot
安装docker
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apt-get install docker-engine
sudo service docker start
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