** Description changed:
+ [Impact]
+
+ * Without the backport, booting from volume requires flavor disk size
+ larger than volume size, which is wrong. This patch skips flavor disk
+ size checking when booting from volume.
+
+ [Test Case]
+
+ * 1. create a bootable volume
+ 2. boot from this bootable volume with a flavor that has disk size smaller
than the volume size
+ 3. error should be reported complaining disk size too small
+ 4. apply this patch
+ 5. boot from that bootable volume with a flavor that has disk size smaller
than the volume size again
+ 6. boot should succeed
+
+ [Regression Potential]
+
+ * none
+
+
Version: 1:2015.1.0-0ubuntu1~cloud0 on Ubuntu 14.04
I attempt to boot an instance from a volume:
nova boot --nic net-id=[NET ID] --flavor v.512mb --block-device
source=volume,dest=volume,id=[VOLUME
ID],bus=virtio,device=vda,bootindex=0,shutdown=preserve vm
This results in nova-api raising a FlavorDiskTooSmall exception in the
"_check_requested_image" function in compute/api.py. However, according
to [1], the root disk limit should not apply to volumes.
[1] http://docs.openstack.org/admin-guide-cloud/content/customize-
flavors.html
Log (first line is debug output I added showing that it's looking at the
image that the volume was created from):
2015-05-21 10:28:00.586 25835 INFO nova.compute.api
[req-1fb882c7-07ae-4c2b-86bd-3d174602d0ae f438b80d215c42efb7508c59dc80940c
8341c85ad9ae49408fa25074adba0480 - - -] image: {'min_disk': 0, 'status':
'active', 'min_ram': 0, 'properties': {u'container_format': u'bare',
u'min_ram': u'0', u'disk_format': u'qcow2', u'image_name': u'Ubuntu 14.04
64-bit', u'image_id': u'cf0dffef-30ef-4032-add0-516e88048d85',
u'libvirt_cpu_mode': u'host-passthrough', u'checksum':
u'76a965427d2866f006ddd2aac66ed5b9', u'min_disk': u'0', u'size': u'255524864'},
'size': 21474836480}
2015-05-21 10:28:00.587 25835 INFO nova.api.openstack.wsgi
[req-1fb882c7-07ae-4c2b-86bd-3d174602d0ae f438b80d215c42efb7508c59dc80940c
8341c85ad9ae49408fa25074adba0480 - - -] HTTP exception thrown: Flavor's disk is
too small for requested image.
Temporary solution: I have special flavor for volume-backed instances so I
just set the root disk on those to 0, but this doesn't work if volume are used
on other flavors.
Reproduce: create flavor with 1 GB root disk size, then try to boot an
instance from a volume created from an image that is larger than 1 GB.
** Also affects: nova (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nova (Ubuntu)
Assignee: (unassigned) => Liang Chen (cbjchen)
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https://bugs.launchpad.net/bugs/1457517
Title:
Unable to boot from volume when flavor disk too small
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