Deleting a machine from a KVM pod doesn't delete its disk image

Bug #1741165 reported by Michael Iatrou on 2018-01-04
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
MAAS
High
Newell Jensen
2.3
High
Newell Jensen

Bug Description

Repro steps:
1. On a KVM pod, compose a new machine.
2. Deploy an OS on the composed machine.
3. Release the machine.
4. Delete the composed machine.
5. Observe that:
   a. The machine is no longer listed in the pod
   b. The disk image of the machine still exists under /var/lib/libvirt/images

Related branches

Michael Iatrou (michael.iatrou) wrote :

dpkg -l | grep maas
ii maas 2.3.0-6434-g all "Metal as a Service" is a physica
ii maas-cli 2.3.0-6434-g all MAAS client and command-line inte
ii maas-common 2.3.0-6434-g all MAAS server common files
ii maas-dhcp 2.3.0-6434-g all MAAS DHCP server
ii maas-dns 2.3.0-6434-g all MAAS DNS server
ii maas-proxy 2.3.0-6434-g all MAAS Caching Proxy
ii maas-rack-cont 2.3.0-6434-g all Rack Controller for MAAS
ii maas-region-ap 2.3.0-6434-g all Region controller API service for
ii maas-region-co 2.3.0-6434-g all Region Controller for MAAS
ii python3-maas-c 2.3.0-6434-g all MAAS python API client (Python 3)
ii python3-maas-p 2.3.0-6434-g all MAAS server provisioning librarie

Blake Rouse (blake-rouse) wrote :

Does virsh still list the volume?

Changed in maas:
status: New → Incomplete
Michael Iatrou (michael.iatrou) wrote :

Yes it does.

Changed in maas:
status: Incomplete → Triaged
importance: Undecided → High
milestone: none → 2.4.0alpha1
Changed in maas:
milestone: 2.4.0alpha1 → 2.4.0alpha2
Newell Jensen (newell-jensen) wrote :

The virsh command executed in MAAS fails with Virsh as well:

$ virsh undefine strong-oriole --remove-all-storage --delete-snapshots --managed-save
Domain strong-oriole has been undefined
error: Failed to remove storage volume 'vda'(/var/lib/libvirt/images/e0f3203e-4872-4111-8ad3-91d1b27fc6e3)
error: unsupported flags (0x2) in function virStorageBackendVolDeleteLocal

This is the reason the storage volumes are not being removed.

Newell Jensen (newell-jensen) wrote :

Taking out the --delete-snapshots flag allows the command to succeed:

$ virsh undefine apt-prawn --managed-save --remove-all-storage
Domain apt-prawn has been undefined
Volume 'vda'(/var/lib/libvirt/images/824fb9c8-5d9c-4223-83b6-faa2e8218fb5) removed.

Newell Jensen (newell-jensen) wrote :

This seems to be a bug with virsh but for a workaround by removing the --delete-snapshots flag.

Changed in maas:
assignee: nobody → Newell Jensen (newell-jensen)
status: Triaged → In Progress
Changed in maas:
status: In Progress → Fix Committed
Changed in maas:
status: Fix Committed → Fix Released
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