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$> nova image-create volume_backed volume_backed_image | $> nova image-create volume_backed volume_backed_image | ||
$> <nowiki>SNAPSHOT_IMAGE_ID=$(glance image-list | awk '/volume_backed_image/ {print $2}')</nowiki> | |||
Boot the image created from the running volume-backed instance: | Boot the image created from the running volume-backed instance: | ||
$ | $> nova boot --flavor 1 --image $SNAPSHOT_IMAGE_ID from_volume_backed | ||
|results= | |results= | ||
You should be able able to | You should be able able to ssh into the second volume-backed instance. | ||
Note that an additional snapshot now exists to back the image: | |||
$> cinder snapshot-list | |||
Note the properties on the new image: | Note the properties on the new image: | ||
$> glance image-show | $> glance image-show $SNAPSHOT_IMAGE_ID | ||
and the lack of image data (as that is taken from the volume snapshot). | and the lack of image data (as that is taken from the volume snapshot). | ||
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Also note for each of the two volume-backed instances you've fired up, there is a volume cloned from the corresponding snapshot: | Also note for each of the two volume-backed instances you've fired up, there is a volume cloned from the corresponding snapshot: | ||
$> | $> cinder list | ||
}} | }} | ||
Latest revision as of 12:13, 26 October 2012
Description
Images can be created from running volume-backed nova instances, analogous to an EBS-backed AMI in EC2.
The image data is not stored in glance, rather it is cloned from a snapshot of the backing volume.
Setup
Run previous test case.
How to test
Create an image from the running instance:
$> nova image-create volume_backed volume_backed_image
$> SNAPSHOT_IMAGE_ID=$(glance image-list | awk '/volume_backed_image/ {print $2}')
Boot the image created from the running volume-backed instance:
$> nova boot --flavor 1 --image $SNAPSHOT_IMAGE_ID from_volume_backed
Expected Results
You should be able able to ssh into the second volume-backed instance.
Note that an additional snapshot now exists to back the image:
$> cinder snapshot-list
Note the properties on the new image:
$> glance image-show $SNAPSHOT_IMAGE_ID
and the lack of image data (as that is taken from the volume snapshot).
Note also that the EC2 API reports the image as being EBS-backed as opposed to instance-store:
$> euca-describe-images
Also note for each of the two volume-backed instances you've fired up, there is a volume cloned from the corresponding snapshot:
$> cinder list