在阿里云主机的Debian操作系统上安装Docker

因为需要新搭建饭团网站，所以需要在阿里云的主机上跑数据库，java环境。
考虑到可扩展性和模块化，所以准备最近流行的docker技术。Docker —— 从入门到实践
阿里云主机1核1G，资源不多，所以就装debian了。欢迎捐助 😛

## 下面命令都是以root用户执行

## 查看内核版本
uname -a
# Debian 3.2.0-4 x86_64
## 版本太低了 < 3.8
## 参照 http://docs.docker.com/installation/debian/ 升级内核

deb http://http.debian.net/debian wheezy-backports main
apt-get update
apt-get install -t wheezy-backports linux-image-amd64

## 重启系统
restart

## 安装 docker 前，需要安装 curl
apt-get install curl

## 安装 docker
curl -sSL https://get.docker.com/ | sh

## 重启 docker 服务.
service docker restart

## 运行 hello world
docker run hello-world

## 不出意外的话会出现
# FATA[0000] Get http:///var/run/docker.sock/v1.18/containers/json?all=1: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS? 
## 这是docker服务没有启动

service docker status
# 会看到
# [FAIL] Docker is not running ... failed!
# 确实没启动

## 显示启动一下
docker -d 
## 会看到
# INFO[0000] +job serveapi(unix:///var/run/docker.sock)   
# INFO[0000] Listening for HTTP on unix (/var/run/docker.sock) 
# INFO[0000] +job init_networkdriver()                    
# Could not find a free IP address range for interface 'docker0'. Please configure its address manually and run 'docker -b docker0'
# INFO[0000] -job init_networkdriver() = ERR (1)          
# FATA[0000] Shutting down daemon due to errors: Could not find a free IP address range for interface 'docker0'. Please configure its address manually and run 'docker -b docker0'


## 因为阿里云把所有内网IP都占用了。所以要改下。

vi /etc/network/interfaces
## 把 "up route add -net 172.16.0.0 netmask 255.240.0.0 gw 10.170.191.247 dev eth0" 这一注释掉（在这一行最前面加'#'）
/etc/init.d/networking restart

service docker start
service docker status
## 能看到 docker is running.

docker run hello-world
## 能看到 hello-world 启动了
# Hello from Docker.
# This message shows that your installation appears to be working correctly.

## 把非管理员用户添加到docker组，方便使用
useradd -G docker <user_login>

遇到不少坑，总结起来还是看官方文档靠谱。