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[Launchpad Bug Tracker <1611074@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init - 0.7.8-49-g9e904bb-
0ubuntu1~16.04.1

---------------
cloud-init (0.7.8-49-g9e904bb-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * debian/cloud-init.postinst: update /etc/fstab on Azure to fix
    future resize operations. (LP: #1611074)
  * New upstream snapshot.
    - Add activate_datasource, for datasource specific code paths.
      (LP: #1611074)
    - systemd: cloud-init-local use RequiresMountsFor=/var/lib/cloud
      (LP: #1642062)

cloud-init (0.7.8-47-gb6561a1-0ubuntu1~16.04.1) xenial-proposed;
urgency=medium

  * debian/cloud-init.templates: enable DigitalOcean by default [Ben Howard]
  * New upstream snapshot.
    - systemd/cloud-init-local.service:
      + replace 'Wants' and 'After' on local-fs.target with more granular
        After=systemd-remount-fs.service and RequiresMountsFor=/var/lib
        and Before=sysinit.target.
        This is done run sufficiently early enough to update /etc/fstab.
        (LP: #1611074)
      + add Before=NetworkManager.service so that cloud-init can render
        NetworkManager network config before it would apply them.
    - systemd/cloud-init.service:
      + add Before=sysinit.target and DefaultDependencies=no (LP: #1611074)
      + drop Requires=networking.service to work where networking.service is
        not needed.
      + add Conflicts=shutdown.target
      + drop unnecessary Wants=local-fs.target
    - net: support reading ipv6 dhcp config from initramfs [LaMont Jones]
      (LP: #1621615)
    - dmidecode: Allow dmidecode to be used on aarch64, and only attempt
      usage on x86, x86_64, and aarch64. [Robert Schweikert]
    - disk-config: udev settle after partitioning in gpt format.
      (LP: #1626243)
    - Add support for snap create-user on Ubuntu Core images. [Ryan Harper]
      (LP: #1619393)
    - Fix sshd restarts for rhel distros. [Jim Gorz]
    - Move user/group functions to new ug_util file [Joshua Harlow]
    - update Gentoo initscripts to run in the correct order [Matthew Thode]
    - MAAS: improve the debugging tool in datasource to consider
      config provided on kernel cmdline.
    - lxd: Update network config for LXD 2.3 [Stéphane Graber] (LP: #1640556)
    - Decode unicode types in decode_binary [Robert Schweikert]
    - Allow ephemeral drive to be unpartitioned [Paul Meyer]
    - subp: add 'update_env' argument which allows for more easily adding
      environment variables to a subprocess call.
    - Adjust mounts and disk configuration for systemd. (LP: #1611074)
    - DataSources:
      + Ec2: protect against non-dictionary in block-device-mapping.
      + AliYun: Add new datasource for Ali-Cloud ECS, that is
        available but not enabled by default [kaihuan.pkh]
      + DigitalOcean: use meta-data for network configuration and
        enable data source by default. [Ben Howard]
      + OpenNebula: replace parsing of 'ip' command with similar function
        available in cloudinit.net.  This fixed unit tests when running
        in environment with no networking.
    - doc changes:
      + Add documentation on stages of boot.
      + make the RST files consistently formated and other improvements.
      + fixed example to not overwrite /etc/hosts [Chris Glass]
      + fix spelling / typos in ca_certs and scripts_vendor.
      + improve HACKING.rst file
      + Add documentation for logging features. [Wesley Wiedenmeier]
      + Improve module documentation and doc cleanup. [Wesley Wiedenmeier]
    - code style and unit test changes:
      + pep8: fix style errors reported by pycodestyle 2.1.0
      + pyflakes: fix issue with pyflakes 1.3 found in ubuntu zesty-proposed.
      + Add coverage dependency to bddeb to fix package build.
      + Add coverage collection to tox unit tests. [Joshua Powers]
      + do not read system /etc/cloud/cloud.cfg.d (LP: #1635350)
      + tests: silence the Cheetah UserWarning about NameMapper C version.
      + Fix python2.6 things found running in centos 6.

 -- Scott Moser <smoser@xxxxxxxxxx>  Fri, 18 Nov 2016 16:51:54 -0500

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

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https://bugs.launchpad.net/bugs/1611074

Title:
  Reformatting of ephemeral drive fails on resize of Azure VM

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Released

Bug description:
  === Begin SRU Template ===
  [Impact]
  In some cases, cloud-init writes entries to /etc/fstab, and on azure it will
  even format a disk for mounting and then write the entry for that 'ephemeral'
  disk there.

  A supported operation on Azure is to "resize" the system.  When you do this
  the system is shut down, resized (given larger/faster disks and more CPU) and
  then brought back up.  In that process, the "ephemeral" disk re-initialized
  to its original NTFS format.  The designed goal is for cloud-init to recognize
  this situation and re-format the disk to ext4.

  The problem is that the mount of that disk happens before cloud-init can
  reformat.  Thats because the entry in fstab has 'auto' and is automatically
  mounted.  The end result is that after resize operation the user will be left
  with the ephemeral disk mounted at /mnt and having a ntfs filesystem rather
  than ext4.

  [Test Case]
  The text in comment 3 describes how to recreate by the original reporter.
  Another way to do this is to just re-format the ephemeral disk as
  ntfs and then reboot.  The result *should* be that after reboot it
  comes back up and has an ext4 filesystem on it.

  1.) boot system on azure
    (for this, i use https://gist.github.com/smoser/5806147, but you can
     use web ui or any other way).
     Save output of
       journalctl --no-pager > journalctl.orig
       systemctl status --no-pager > systemctl-status.orig
       systemctl --no-pager > systemctl.orig

  2.) unmount the ephemeral disk
     $ umount /mnt

  3.) repartition it so that mkfs.ntfs does less and is faster
     This is not strictly necessary, but mkfs.ntfs can take upwards of
     20 minutes.  shrinking /dev/sdb2 to be 200M means it will finish
     in < 1 minute.

     $ disk=/dev/disk/cloud/azure_resource
     $ part=/dev/disk/cloud/azure_resource-part1
     $ echo "2048,$((2*1024*100)),7" | sudo sfdisk "$disk"
     $ time mkfs.ntfs --quick "$part"

  4.) reboot
  5.) expect that /proc/mounts has /dev/disk/cloud/azure_resource-part1 as ext4
      and that fstab has x-systemd.requires in it.

      $ awk '$2 == "/mnt" { print $0 }' /proc/mounts
      /dev/sdb1 /mnt ext4 rw,relatime,data=ordered 0 0

      $ awk '$2 == "/mnt" { print $0 }' /etc/fstab
      /dev/sdb1 /mnt auto defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig 0 2

  6.) collect journal and systemctl information as described in step 1 above.
      Compare output, specifically looking for case insensitve "breaks"

  [Regression Potential]
  Regression is unlikely.  Likely failure case is just that the problem is not
  correctly fixed, and the user ends up with either an NTFS formated disk that
  is mounted at /mnt or there is nothing mounted at /mnt.

  === End SRU Template ===

  After resizing a 16.04 VM on Azure, the VM is presented with a new
  ephemeral drive (of a different size), which initially is NTFS
  formatted. Cloud-init tries to format the appropriate partition ext4,
  but fails because it is mounted. Cloud-init has unmount logic for
  exactly this case in the get_data call on the Azure data source, but
  this is never called because fresh cache is found.

  Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] handlers.py[DEBUG]: start: init-network/check-cache: attempting to read from cache [trust]
  Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Reading from /var/lib/cloud/instance/obj.pkl (quiet=False)
  Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Read 5950 bytes from /var/lib/cloud/instance/obj.pkl
  Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] stages.py[DEBUG]: restored from cache: DataSourceAzureNet [seed=/dev/sr0]
  Jun 27 19:07:47 azubuntu1604arm [CLOUDINIT] handlers.py[DEBUG]: finish: init-network/check-cache: SUCCESS: restored from cache: DataSourceAzureNet [seed=/dev/sr0]
  ...
  Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] cc_disk_setup.py[DEBUG]: Creating file system None on /dev/sdb1
  Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] cc_disk_setup.py[DEBUG]:      Using cmd: /sbin/mkfs.ext4 /dev/sdb1
  Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Running command ['/sbin/mkfs.ext4', '/dev/sdb1'] with allowed return codes [0] (shell=False, capture=True)
  Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[DEBUG]: Creating fs for /dev/disk/cloud/azure_resource took 0.052 seconds
  Jun 27 19:07:48 azubuntu1604arm [CLOUDINIT] util.py[WARNING]: Failed during filesystem operation#012Failed to exec of '['/sbin/mkfs.ext4', '/dev/sdb1']':#012Unexpected error while running command.#012Command: ['/sbin/mkfs.ext4', '/dev/sdb1']#012Exit code: 1#012Reason: -#012Stdout: ''#012Stderr: 'mke2fs 1.42.13 (17-May-2015)\n/dev/sdb1 is mounted; will not make a filesystem here!\n'

  $ lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04
  $ cat /etc/cloud/build.info
  build_name: server
  serial: 20160721
  ~$ dpkg -l cloud-init
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                             Version               Architecture          Description
  +++-================================-=====================-=====================-=====================================================================
  ii  cloud-init                       0.7.7~bzr1256-0ubuntu all                   Init scripts for cloud instances

  We're seeing ~100% repro of this bug on resize, where the only success
  cases are caused by another bug that messes up fstab and prevents
  mounting of the drive.

  Related bugs:
   bug 1629868: cloud-init times out because of no dbus
   bug 1603222: Azure: incorrect entry in fstab for ephemeral disk

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