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[Launchpad Bug Tracker <1647708@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
0.7.8-68-gca3ae67-0ubuntu1~16.10.1

---------------
cloud-init (0.7.8-68-gca3ae67-0ubuntu1~16.10.1) yakkety; urgency=medium

  * debian/cherry-pick: add utility for cherry picking commits from upstream
    into patches in debian/patches.
  * New upstream snapshot.
    - mounts: use mount -a again to accomplish mounts (LP: #1647708)
    - CloudSigma: Fix bug where datasource was not loaded in local search.
      (LP: #1648380)
    - when adding a user, strip whitespace from group list
      [Lars Kellogg-Stedman] (LP: #1354694)
    - fix decoding of utf-8 chars in yaml test
    - Replace usage of sys_netdev_info with read_sys_net (LP: #1625766)
    - fix problems found in python2.6 test.
    - OpenStack: extend physical types to include hyperv, hw_veb, vhost_user.
      (LP: #1642679)
    - tests: fix assumptions that expected no eth0 in system. (LP: #1644043)
    - net/cmdline: Consider ip= or ip6= on command line not only ip=
      (LP: #1639930)
    - Just use file logging by default [Joshua Harlow] (LP: #1643990)
    - Improve formatting for ProcessExecutionError [Wesley Wiedenmeier]
    - flake8: fix trailing white space
    - Doc: various documentation fixes [Sean Bright]
    - cloudinit/config/cc_rh_subscription.py: Remove repos before adding
      [Brent Baude]
    - packages/redhat: fix rpm spec file.
    - main: set TZ in environment if not already set. [Ryan Harper]
    - disk_setup: Use sectors as unit when formatting MBR disks with sfdisk.
      [Daniel Watkins] (LP: #1460715)

 -- Scott Moser <smoser@xxxxxxxxxx>  Mon, 19 Dec 2016 15:07:12 -0500

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

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https://bugs.launchpad.net/bugs/1647708

Title:
  Ephemeral disk on xenial is not mounted at boot

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

Bug description:
  === Begin SRU Template ===
  [Impact]
  An ephemeral disk will not correctly be mounted on /mnt.
  This affects Azure and other instances where an ephemeral device is
  mounted by default on /mnt.  It is recreated in Azure and on OpenStack.

  This can be mitigated by either:
   1.) mount -a
   2.) reboot

  [Test Case]
  In a correctly functioning image on OpenStack or Azure, you should be
  able to:

  1.) Launch an instance
  2.) ssh into instance and look around
     $ awk '$2 == "/mnt" { print $0 }' /etc/fstab
     /dev/vdb /mnt  auto  defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig  0  2
     $ awk '$2 == "/mnt" { print $0 }' /proc/mounts
  /dev/vdb /mnt vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0

     $ df -h /mnt
     Filesystem      Size  Used Avail Use% Mounted on
     /dev/vdb         40G   32K   40G   1% /mnt

  To check that this is functional with -proposed, after you've seen it
  failed

  3.) enable -proposed and apt-get install cloud-init
  4.) clean up and reboot as if fresh:
      sudo rm -Rf /var/lib/cloud /var/log/cloud-init
      sudo sed -i '/cloudconfig/d' /etc/fstab
      sudo reboot

  [Regression Potential]
  This is a regression caused by bug 1611074, so in addition to the above
  test case, we should go through the test cases shown there to see that
  those also work.
  === End SRU Template ===


  When I boot the latest xenial Azure image (containing cloud-init
  0.7.8-49-g9e904bb-0ubuntu1~16.04.1), the ephemeral disk does not end
  up mounted (though it is formatted appropriately).  Restarting the
  mnt.mount service does mount it, which suggests there is an issue in
  the ordering of the services at boot.

  $ mount | grep mnt
  $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
     Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
     Active: inactive (dead)
      Where: /mnt
       What: /dev/disk/cloud/azure_resource-part1
       Docs: man:fstab(5)
             man:systemd-fstab-generator(8)
  $ sudo journalctl -u mnt.mount
  -- No entries --
  $ cat /etc/fstab
  # CLOUD_IMG: This file was created/modified by the Cloud Image build process
  UUID=6a8554fa-8e1d-4916-ba03-4ca3837feb34	/	 ext4	defaults,discard	0 0
  /dev/disk/cloud/azure_resource-part1	/mnt	auto	defaults,nofail,x-systemd.requires=cloud-init.service,comment=cloudconfig	0	2
  $ sudo systemctl restart mnt.mount
  $ mount | grep mnt
  /dev/sdb1 on /mnt type ext4 (rw,relatime,data=ordered)
  $ ls /mnt/
  lost+found
  $ sudo systemctl status mnt.mount
  ● mnt.mount - /mnt
     Loaded: loaded (/etc/fstab; bad; vendor preset: enabled)
     Active: active (mounted) since Tue 2016-12-06 12:49:06 UTC; 6s ago
      Where: /mnt
       What: /dev/sdb1
       Docs: man:fstab(5)
             man:systemd-fstab-generator(8)
    Process: 1916 ExecMount=/bin/mount /dev/disk/cloud/azure_resource-part1 /mnt -o defaults,x-systemd.requires=cloud-init.service,comment=cloudconfig (code=exited, status=0/SUCCESS)
      Tasks: 0
     Memory: 88.0K
        CPU: 15ms

  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounting /mnt...
  Dec 06 12:49:06 xenial-161206-1345 systemd[1]: Mounted /mnt.

  Related bugs:
   * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM
   * bug 1642383: Unable to configure swap space on ephemeral disk in Azure

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