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[Scott Moser <smoser@xxxxxxxxxx>]

** Also affects: cloud-init (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: cloud-init (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: cloud-init (Ubuntu Artful)
   Importance: High
     Assignee: Scott Moser (smoser)
       Status: In Progress

** Also affects: cloud-init (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Changed in: cloud-init (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: cloud-init (Ubuntu Yakkety)
       Status: New => Confirmed

** Changed in: cloud-init (Ubuntu Zesty)
       Status: New => Confirmed

** Changed in: cloud-init (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: cloud-init (Ubuntu Yakkety)
   Importance: Undecided => Medium

** Changed in: cloud-init (Ubuntu Zesty)
   Importance: Undecided => Medium

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1686514

Title:
  Azure: cloud-init does not handle reformatting GPT partition ephemeral
  disks

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  In Progress
Status in cloud-init source package in Xenial:
  Confirmed
Status in cloud-init source package in Yakkety:
  Confirmed
Status in cloud-init source package in Zesty:
  Confirmed
Status in cloud-init source package in Artful:
  In Progress

Bug description:
  Some Azure instances such as L32 or G5 have very large ephemeral disks
  which are partitioned via GPT vs. smaller ephemeral disks that have
  dos disklabels.

  At first boot of an instance the ephemeral disk is prepared and
  formatted properly. But if the instance is deallocated and then
  reallocated (thus receiving a new ephemeral disk) then cloud-init does
  not handle reformatting GPT partition ephemeral disks properly.
  Therefore /mnt is never mounted again.

  Test cases:
   1. Deploy an L32(s) VM on Azure
   2. Log in and ensure that the ephemeral disk is formatted and mounted to /mnt
   3. Via the portal you can "Redeploy" the VM to a new Azure Host (or alternatively stop and deallocate the VM for some time, and then restart/reallocate the VM).

  Expected Results:
   - After reallocation we expect the ephemeral disk to be formatted and mounted to /mnt.

  Actual Results:
   - After reallocation /mnt is not mounted and there are errors in the cloud-init log.

  *This was tested on Ubuntu 16.04 - but may affect other releases.

  Note: This bug a regression from previous cloud-init releases. GPT
  support for Azure ephemeral disk handling was added to cloud-init via
  this bug: https://bugs.launchpad.net/ubuntu/+source/cloud-
  init/+bug/1422919.

  Related bugs:
   * bug 1691489: fstab entries written by cloud-config may not be mounted

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