对官网上内容的一个翻译，方便自己以后查找资料用
The following diagrams and tables show the required virtual machine (VM) states and task states for various commands issued by the user.
下面的图和表，显示了，当用户下发各种命令时，虚机的状态和任务状态
Allowed State Transitions（允许的状态变化）
Requirements for Commands（命令行要求）
VM states and Possible Commands(虚机状态和可能的命令)
Create Instance States(创建虚机的状态)
The following diagram shows the sequence of VM states, task states, and power states when a new VM instance is created.
下图展示了当创建一个虚机时，虚机状态、任务状态、电源状态时序图
官网上链接：https://docs.openstack.org/nova/pike/reference/vm-states.html