算法，时空数据挖掘

Share another article about OpenStack: http://os.51cto.com/art/201205/336386.htm.   OpenStack既是一个社区，也是一个项目和一个开源软件，它提供了一个部署云的操作平台或工具集。其宗旨在于，帮助组织运行为虚拟计算或存储服务的云，为公有云、私有云，也为大云、小云提供可扩展的、灵活的云计算。   1

Today when I used Openstack, I made a mistake. Because of some debug issues I created a Ubuntu image while changing its  /etc/network/interfaces to static IP[1], which makes the OpenStack can't not as

I have read some documents  and they all say that the command  "nova list" can output all the instances[1]. But when I try, nothing output. Then I search and got a good explanation in [2]. [1