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Glance Snapshots (repository of images)
- Glance snapshots capture the state of a running or stopped instance's root disk.
- They create an image of the instance’s disk, which can be used to launch new instances or restore the current state.
- Snapshots are stored in Glance and can be viewed with
openstack image list. - Keep in mind: If the instance is booted from a volume, the snapshot will be created on the volume only — not in the Glance image repository. However, you will see a snapshot listed in the images repository with a size of 0, which consists only of metadata about block device mappings.
- When launching a new instance from the snapshot, OpenStack will recreate the original Cinder volumes if they were part of the snapshot.
- If you want to store the root disk on a volume in the image repository, you need to create a volume from the snapshot and then upload the volume to an image.
- For detailed info go to Image snapshots page.
Cinder Volume Backups
- Cinder backups create a full copy of a volume that can be restored or cloned.
- The backup service stores the volume data independently, allowing recovery even if the original volume is lost. Backup service at PSNC is stored on independet independent S3 backend.
- For detailed info go to Volume backups page.
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