openstack instance resize migrate详解
1.resize在配置文件中：/etc/nova/nova.conf
allow_resize_to_same_host=Ture表示允许迁移到本机，默认是False
resize方式有2种在dashboard web页面resize：
登陆dashboard–project–instances–more–resize instance
http://blog.51cto.com/attachment/201404/10/28863090_13970988609U0W.png
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