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Virtual Machine States and Transitions

Preconditions for commands

The following diagrams show the required virtual machine (VM) states and task states for various commands issued by the user:

digraph states { node [fontsize=10 fontname="Monospace"] /* states */ building [label="BUILDING"] active [label="ACTIVE"] paused [label="PAUSED"] suspended [label="SUSPENDED"] stopped [label="STOPPED"] rescued [label="RESCUED"] resized [label="RESIZED"] soft_deleted [label="SOFT_DELETED"] deleted [label="DELETED"] error [label="ERROR"] /* apis */ create [shape="rectangle"] create -> active create -> error building -> create delete [shape="rectangle"] delete -> deleted building -> delete paused -> delete suspended -> delete stopped -> delete rescued -> delete soft_deleted -> delete error -> delete soft_delete [shape="rectangle"] soft_delete -> soft_deleted soft_delete -> error active -> soft_delete stopped -> soft_delete restore [shape="rectangle"] restore -> active restore -> error soft_deleted -> restore pause [shape="rectangle"] pause -> paused pause -> error active -> pause unpause [shape="rectangle"] unpause -> active unpause -> error paused -> unpause suspend [shape="rectangle"] suspend -> suspended suspend -> error active -> suspend resume [shape="rectangle"] resume -> active resume -> error suspended -> resume start [shape="rectangle"] start -> active start -> error stopped -> start stop [shape="rectangle"] stop -> stopped stop -> error active -> stop rescue [shape="rectangle"] rescue -> rescued rescue -> error active -> rescue stopped -> rescue unrescue [shape="rectangle"] unrescue -> active rescued -> unrescue resize [shape="rectangle"] resize -> resized resize -> error active -> resize stopped -> resize confirm_resize [shape="rectangle"] confirm_resize -> active confirm_resize -> error resized -> confirm_resize confirm_resize [shape="rectangle"] revert_resize -> active revert_resize -> error resized -> revert_resize snapshot [shape="rectangle"] snapshot -> active snapshot -> stopped snapshot -> error active -> snapshot stopped -> snapshot backup [shape="rectangle"] backup -> active backup -> stopped backup -> error active -> backup stopped -> backup rebuild [shape="rectangle"] rebuild -> active rebuild -> error active -> rebuild stopped -> rebuild set_admin_password [shape="rectangle"] set_admin_password -> active set_admin_password -> error active -> set_admin_password reboot [shape="rectangle"] reboot -> active reboot -> error active -> reboot stopped -> reboot rescued -> reboot live_migrate [shape="rectangle"] live_migrate -> active live_migrate -> error active -> live_migrate }

../_images/PowerStates1.png ../_images/PowerStates2.png

Create instance states

The following diagram shows the sequence of VM states, task states, and power states when a new VM instance is created.

../_images/run_instance_walkthrough.png