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[Scott Moser <smoser@xxxxxxxxxx>]

This is fixed in commit
 9e904bbc3336b96475bfd00fb3bf1262ae4de49f
https://git.launchpad.net/cloud-init/commit/?id=9e904bbc3336b96475bfd00fb3bf1262ae4de49f

** Changed in: cloud-init (Ubuntu)
       Status: Confirmed => Fix Released

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

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

** Changed in: cloud-init
       Status: In Progress => Fix Committed

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

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

** Description changed:

  During provisioning cloud-init adds an entry for the ephemeral disk in
  /etc/fstab. After provisioning this entry is correct and points to
  "/dev/disk/azure/resource-part1". This symlink is created dynamically by
  66-azure-storage.rules.
  
  For some reason after the first reboot cloud-init overwrites the fstab
  entry and changes the "/dev/disk/azure/resource-part1" to the device
  name that it points to, i.e. /dev/sdb1.  However, this is incorrect
  since /dev/sd* device names are not persistent.
  
- 
  Repro:
  
  1) Provision an Ubuntu VM on Azure (I tested with 14.04.4)
  2) The fstab entry for the ephemeral disk (/mnt) correctly points to "/dev/disk/azure/resource-part1".
  3) Reboot the VM (sudo reboot)
  4) The fstab entry now incorrectly points to /dev/sdb1 instead of the symlink.
  
  Impact:
  There is a chance that the customer's ephemeral disk will not be mounted properly if the device names change after a reboot.
+ 
+ Related bugs:
+  * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM

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https://bugs.launchpad.net/bugs/1603222

Title:
  Azure: incorrect entry in fstab for ephemeral disk

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Precise:
  New
Status in cloud-init source package in Trusty:
  Confirmed
Status in cloud-init source package in Xenial:
  Fix Committed
Status in cloud-init source package in Yakkety:
  Confirmed

Bug description:
  During provisioning cloud-init adds an entry for the ephemeral disk in
  /etc/fstab. After provisioning this entry is correct and points to
  "/dev/disk/azure/resource-part1". This symlink is created dynamically
  by 66-azure-storage.rules.

  For some reason after the first reboot cloud-init overwrites the fstab
  entry and changes the "/dev/disk/azure/resource-part1" to the device
  name that it points to, i.e. /dev/sdb1.  However, this is incorrect
  since /dev/sd* device names are not persistent.

  Repro:

  1) Provision an Ubuntu VM on Azure (I tested with 14.04.4)
  2) The fstab entry for the ephemeral disk (/mnt) correctly points to "/dev/disk/azure/resource-part1".
  3) Reboot the VM (sudo reboot)
  4) The fstab entry now incorrectly points to /dev/sdb1 instead of the symlink.

  Impact:
  There is a chance that the customer's ephemeral disk will not be mounted properly if the device names change after a reboot.

  Related bugs:
   * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM

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