概述
目前，常见的Linux发行版本官方都提供了用于云环境（如OpenStack）的Image的下载。下表为下载地址的总结。
下载地址
| 发行版本 | 下载地址 |
|---|---|
| centos-6.5-x86_64 | http://cloud.centos.org/centos/6.5/images/ |
| centos-7.0-x86_64 | http://cloud.centos.org/centos/7/images/ |
| fedora-20 i386 & x86_64 | http://mirrors.ustc.edu.cn/fedora/linux/releases/20/Images/ |
| fedora-21 i386 & x86_64 | http://mirrors.ustc.edu.cn/fedora/linux/releases/21/Cloud/Images/ |
| rhel-6.5- i386 & x86_64 | https://access.redhat.com/downloads/content/69/ver=/rhel---6/6.5/x86_64/product-downloads |
| rhel-7.0-x86_64 | https://access.redhat.com/downloads/content/69/ver=/rhel---7/7.0/x86_64/product-downloads |
| ubuntu-10.04 i386 & x86_64 | http://cloud-images.ubuntu.com/lucid/current/ |
| ubuntu-12.04 i386 & x86_64 | http://cloud-images.ubuntu.com/precise/current/ |
| ubuntu-14.04 i386 & x86_64 | http://cloud-images.ubuntu.com/trusty/current/ |
** 注意 ** rhel的Image下载需要RedHat帐号。