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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** Changed in: nova
   Importance: High => Medium

** Changed in: nova/newton
   Importance: Undecided => Medium

** Changed in: nova/newton
       Status: New => In Progress

** Changed in: nova/newton
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1597669

Title:
  [libvirt] disk.config.rescue is not used when rescuing an instance

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  In Progress

Bug description:
  Description
  ===========

  I931421ea688641e2ceb212c6dc099639c53433f2 introduced a callback to
  _create_configdrive from _create_domain that recreates the config disk
  of an instance during a rescue.

  However neither the original or this recreated config disk are used by
  the instance during the resulting rescue.

  Steps to reproduce
  ==================

  $ nova boot --image cirros-0.3.4-x86_64-uec --flavor 1 test-config-rescue
  [..]
  $ nova rescue test-config-rescue
  [..]
  $ nova list
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  | ID                                   | Name               | Status | Task State | Power State | Networks         |
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  | 5ef76bd4-4e4f-46dd-88f6-dcd212e54802 | test-config-rescue | RESCUE | -          | Running     | private=10.0.0.2 |
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  $ ll ../data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/
  total 28556
  -rw-------. 1 qemu  qemu        16939 Jun 30 04:39 console.log
  -rw-r--r--. 1 qemu  qemu     10682368 Jun 30 04:39 disk
  -rw-rw-r--. 1 qemu  qemu       432128 Jun 30 04:38 disk.config
  -rw-rw-r--. 1 stack libvirtd   432128 Jun 30 04:39 disk.config.rescue
  -rw-r--r--. 1 stack libvirtd      534 Jun 30 04:39 disk.info
  -rw-r--r--. 1 qemu  qemu       197120 Jun 30 04:39 disk.rescue
  -rw-rw-r--. 1 qemu  qemu      4979632 Jun 30 04:38 kernel
  -rw-rw-r--. 1 qemu  qemu      4979632 Jun 30 04:39 kernel.rescue
  -rw-rw-r--. 1 stack libvirtd     3146 Jun 30 04:39 libvirt.xml
  -rw-rw-r--. 1 qemu  qemu      3740163 Jun 30 04:38 ramdisk
  -rw-rw-r--. 1 qemu  qemu      3740163 Jun 30 04:39 ramdisk.rescue
  -rw-rw-r--. 1 stack libvirtd     4569 Jun 30 04:39 unrescue.xml
  $ grep config ../data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/libvirt.xml 
        <nova:name>test-config-rescue</nova:name>
  $ sudo virsh domblklist 5ef76bd4-4e4f-46dd-88f6-dcd212e54802
  Target     Source
  ------------------------------------------------
  vda        /opt/stack/data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/disk.rescue
  vdb        /opt/stack/data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/disk

  
  $ nova unrescue test-config-rescue
  $ nova list
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  | ID                                   | Name               | Status | Task State | Power State | Networks         |
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  | 5ef76bd4-4e4f-46dd-88f6-dcd212e54802 | test-config-rescue | ACTIVE | -          | Running     | private=10.0.0.2 |
  +--------------------------------------+--------------------+--------+------------+-------------+------------------+
  $ ll ../data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/
  total 19604
  -rw-------. 1 qemu  qemu        20403 Jun 30 04:48 console.log
  -rw-r--r--. 1 qemu  qemu     10878976 Jun 30 04:47 disk
  -rw-rw-r--. 1 qemu  qemu       432128 Jun 30 04:38 disk.config
  -rw-r--r--. 1 stack libvirtd      534 Jun 30 04:39 disk.info
  -rw-rw-r--. 1 qemu  qemu      4979632 Jun 30 04:38 kernel
  -rw-rw-r--. 1 stack libvirtd     4569 Jun 30 04:47 libvirt.xml
  -rw-rw-r--. 1 qemu  qemu      3740163 Jun 30 04:38 ramdisk
  $ grep config ../data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/libvirt.xml 
        <nova:name>test-config-rescue</nova:name>
        <source file='/opt/stack/data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/disk.config'/>
  $ sudo virsh domblklist 5ef76bd4-4e4f-46dd-88f6-dcd212e54802
  Target     Source
  ------------------------------------------------
  vda        /opt/stack/data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/disk
  hdd        /opt/stack/data/nova/instances/5ef76bd4-4e4f-46dd-88f6-dcd212e54802/disk.config

  
  Expected result
  ===============
  disk.config.rescue attached to the rescued instance.

  Actual result
  =============
  No config disks are attached to the rescued instance. Only the rescue disk and original root disk are attached.

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
     list for all releases: http://docs.openstack.org/releases/

     $ pwd
     /opt/stack/nova
     $ git rev-parse HEAD
     23153952a979c93a414705744b0f8ba4bde18f75

  2. Which hypervisor did you use?
     libvirt + kvm

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?
     N/A

  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)
     N/A

  Logs & Configs
  ==============

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