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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

This isn't a bug. Detaching the root volume/device from a volume-backed
server is not supported at this time. That feature is being proposed for
the Stein release though:

https://review.openstack.org/#/c/600628/

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1790277

Title:
  Failed to detach volume cause of root device attribute

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========
  At first use one volume as bootable device for the instance,
  then use another attached bootable volume as the instance's 
  bootable device.
  But when detaching the first volume from the instance,
  got error.

  Steps to reproduce
  ==================
  * Boot instance vm01 from volume vol01 
  * Create another volume vol02 from image, update 'bootable' is true
  * Shutoff vm01
  * Attach vol02 to vm01
  * Update 'bootable' of vol01 to false
  * Start vm01
  * Detach vol01 from vm01

  Expected result
  ===============
  Detach successfully

  Actual result
  =============
  Failed to detached

  Environment
  ===========
  1. Exact version of OpenStack you are running.
  # dpkg -l | grep nova
  ii  nova-api                             2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - compute API frontend
  ii  nova-common                          2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - common files
  ii  nova-conductor                       2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - conductor service
  ii  nova-consoleauth                     2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - Console Authenticator
  ii  nova-consoleproxy                    2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - NoVNC proxy
  ii  nova-doc                             2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - documentation
  ii  nova-placement-api                   2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - placement API frontend
  ii  nova-scheduler                       2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - virtual machine scheduler
  ii  python-nova                          2:16.1.0-1~u16.04+mcp134                   all          OpenStack Compute - libraries
  ii  python-novaclient                    2:9.1.1-1~u16.04+mcp6                      all          client library for OpenStack Compute API - Python 2.7

  2. Which hypervisor did you use?
     Libvirt + KVM

  2. Which storage type did you use?
     Ceph

  3. Which networking type did you use?
     Neutron with OpenVSwitch

  Logs & Configs
  ==============
  Forbidden: Can't detach root device volume (HTTP 403) (Request-ID: req-c6957e61-c375-4110-939e-6ebd6bf37077)

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