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[Scott Moser <smoser@xxxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1292648

Title:
  [SRU] cloud-init should check/format Azure empheral disks each boot

Status in Init scripts for use on cloud images:
  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 Saucy:
  New

Bug description:
  SRU Justification

  [IMPACT] Users on Windows Azure are guaranteed to have the ephemeral
  device as ext4 for the first boot. Subsequent boots may result in fuse
  mounted NTFS file system.

  [TEST CASE] 
  Defined in comment 3.

  [Regression Potential] Low. This change is scope only to the Windows Azure datasource and the behavior complies with expected behavior of Windows Azure: the ephemeral disk is not durable between boots. From Microsoft documentation:
  > Because data on a resource disk may not be durable across reboots, it is often used by
  > applications and processes running in the virtual machine for transient and temporary
  > storage of data. It is also used to store page or swap files for the operating system.
  (See http://www.windowsazure.com/en-us/documentation/articles/storage-windows-attach-disk/)

  Even so, the change to Cloud-init is scope to only replace the
  ephemeral disk when the disk is 1) NTFS; 2) has a label of "Temporary
  Storage"; and 3) has no files on it. When the disk matches, cloud-init
  will turn the code paths for formating the ephemeral disk for that
  boot only.

  [ORIGINAL REPORT]

  On Windows Azure, the ephemeral disk should be treated as ephemeral
  per boot, not per instance.

  Microsoft has informed us that under the following conditions an ephemeral disk may disappear:
  1. The user resizes the instance
  2. A fault causes the instance to move from one physical host to another
  3. A machine is shutdown and then started again

  Essentially, on Azure, the ephemeral disk is extremely ephemeral.
  Users who hit any of the above situations are discovering that /mnt is
  mount with their default NTFS file system.

  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: cloud-init 0.7.5~bzr964-0ubuntu1 [modified: usr/lib/python2.7/dist-packages/cloudinit/config/cc_disk_setup.py usr/lib/python2.7/dist-packages/cloudinit/config/cc_final_message.py usr/lib/python2.7/dist-packages/cloudinit/config/cc_seed_random.py usr/lib/python2.7/dist-packages/cloudinit/sources/DataSourceAzure.py usr/lib/python2.7/dist-packages/cloudinit/sources/DataSourceCloudSigma.py usr/lib/python2.7/dist-packages/cloudinit/sources/DataSourceSmartOS.py]
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  Date: Fri Mar 14 17:53:20 2014
  PackageArchitecture: all
  SourcePackage: cloud-init
  UpgradeStatus: No upgrade log present (probably fresh install)

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