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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

Change https://review.openstack.org/#/c/550648/ marked the
block_device_mapping_v2.boot_index parameter for POST /servers as
optional, but it's only optional since this change in Queens:

https://review.openstack.org/#/c/524208/

Before that, you'll get an error like this if you boot from volume but
don't specify a boot_index for each BDM in the list:

2018-04-23 12:34:13,308 INFO [nova.api.openstack.wsgi] HTTP exception thrown: Block Device Mapping is Invalid: Boot sequence for the instance and image/block device mapping combination is not valid.
    2018-04-23 12:34:13,310 INFO [nova.api.openstack.requestlog] 127.0.0.1 "POST /v2.1/6f70656e737461636b20342065766572/servers" status: 400 len: 164 microversion: 2.1 time: 0.129485

Therefore we should probably mark the parameter as required since the
API reference applies to older versions/releases of the API too.

** Affects: nova
     Importance: Medium
         Status: Triaged


** Tags: api-ref

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https://bugs.launchpad.net/bugs/1766306

Title:
  api-ref: block_device_mapping_v2.boot_index is required until queens

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  Change https://review.openstack.org/#/c/550648/ marked the
  block_device_mapping_v2.boot_index parameter for POST /servers as
  optional, but it's only optional since this change in Queens:

  https://review.openstack.org/#/c/524208/

  Before that, you'll get an error like this if you boot from volume but
  don't specify a boot_index for each BDM in the list:

  2018-04-23 12:34:13,308 INFO [nova.api.openstack.wsgi] HTTP exception thrown: Block Device Mapping is Invalid: Boot sequence for the instance and image/block device mapping combination is not valid.
      2018-04-23 12:34:13,310 INFO [nova.api.openstack.requestlog] 127.0.0.1 "POST /v2.1/6f70656e737461636b20342065766572/servers" status: 400 len: 164 microversion: 2.1 time: 0.129485

  Therefore we should probably mark the parameter as required since the
  API reference applies to older versions/releases of the API too.

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