ECS Statuses

An ECS can be in one of the following statuses specified in ECS APIs:

status: specifies an ECS status, which is generated by OS-EXT-STS:vm_state and OS-EXT-STS:task_state.
OS-EXT-STS:vm_state: indicates that the ECS is in a stable state after an operation is performed. This is an extended attribute.
OS-EXT-STS:task_state: indicates an intermediate status in which the ECS is processing an operation performed on it. This is an extended attribute.

**Table 1** Statuses
Status	Description
BUILD	The ECS has been created but is not running yet.
REBOOT	The ECS is being restarted.
HARD_REBOOT	The ECS is being forcibly restarted.
REBUILD	The ECS is being rebuilt.
MIGRATING	The ECS is undergoing live migration.
RESIZE	The ECS has received a specifications modification request and has started to perform the modification.
ACTIVE	The ECS is running properly.
SHUTOFF	The ECS has been properly stopped.
REVERT_RESIZE	The ECS is rolling back to its previous size.
VERIFY_RESIZE	The ECS is verifying the new size.
ERROR	The ECS is abnormal.
DELETED	The ECS has been deleted.
SHELVED	The ECS booting from an image is shelved.
SHELVED_OFFLOADED	The ECS booting from a volume is shelved.
UNKNOWN	The ECS status is unknown.

**Table 2** **OS-EXT-STS:vm_state** statuses
Status	Description
building	The ECS has been created but is not running yet.
active	The ECS is running properly.
stopped	The ECS has been properly stopped.
resized	The ECS has been resized (specifications have been modified).
error	The ECS is abnormal.
deleted	The ECS has been deleted.
shelved	The ECS booting from an image is shelved.
shelved_offloaded	The ECS booting from a volume is shelved.

**Table 3** **OS-EXT-STS:task_state** statuses
Status	Description
scheduling	The system is scheduling resources when the ECS is being created.
block_device_mapping	Disks are being prepared for the ECS that is being created.
networking	Networking resources are being prepared for the ECS that is being created.
spawning	The ECS is being created internally.
rebooting	The ECS is being restarted.
reboot_pending	The ECS is pending a restart.
reboot_started	The ECS is being restarted internally.
rebooting_hard	The ECS is being forcibly restarted.
reboot_pending_hard	The ECS is pending a force restart.
reboot_started_hard	The ECS is being forcibly restarted internally.
rebuilding	The ECS is being rebuilt.
rebuild_block_device_mapping	Disks are being prepared for the ECS that is being rebuilt.
rebuild_spawning	The ECS is being rebuilt internally.
migrating	The ECS is undergoing live migration.
resize_prep	The ECS is preparing for being resized.
resize_migrating	The ECS is undergoing migration during the resize phase.
resize_migrated	The ECS has finished migration during the resize phase.
resize_finish	The ECS is finishing the resize operation during the resize phase.
resize_reverting	The ECS is rolling back to its previous size during the resize phase.
powering-off	The ECS is being stopped.
powering-on	The ECS is being started.
deleting	The ECS is being deleted.
shelving	The ECS booting from an image is being shelved.
shelving_offloading	The ECS booting from a volume is being shelved.
shelving_image_pending_upload	A shelving image is pending upload.
shelving_image_uploading	A shelving image is being uploaded.
unshelving	The ECS is being unshelved.

**Table 4** Mapping between statuses
vm_state	task_state	status
building	scheduling block_device_mapping networking spawning null	BUILD
active	rebooting reboot_pending reboot_started	REBOOT
	rebooting_hard reboot_pending_hard reboot_started_hard	HARD_REBOOT
	rebuilding rebuild_block_device_mapping rebuild_spawning	REBUILD
	migrating	MIGRATING
	powering-off deleting null	ACTIVE
stopped	resize_prep resize_migrating resize_migrated resize_finish	RESIZE
	rebuilding rebuild_block_device_mapping rebuild_spawning	REBUILD
	powering-on deleting null	SHUTOFF
resized	resize_reverting	REVERT_RESIZE
resized	null	VERIFY_RESIZE
error	rebuilding rebuild_block_device_mapping rebuild_spawning	REBUILD
error	deleting null	ERROR
deleted	null	DELETED
shelved	shelving shelving_image_pending_upload shelving_image_uploading unshelving null	SHELVED
shelved_offloaded	shelving_offloading unshelving null	SHELVED_OFFLOADED