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[Launchpad Bug Tracker <1639930@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/1639930

Title:
  initramfs network configuration ignored if only ip6= on kernel command
  line

Status in cloud-init:
  Fix Released
Status in MAAS:
  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]
  On a system booted with both ip6= and ip= on the kernel command line
  cloud-init will raise an exception and fail to process user-data and
  have its normal affect on boot.

  That is because cloud-init previously raised an exception when more
  than one file in /run/net*.conf declared the same DEVICE.  Changes to
  isc-dhcp and initramfs-tools have changed their behavior and cloud-init
  has to adjust to allow DEVICE6= and DEVICE= in separate files.

  [Test Case]
  Boot a system on a network with both ipv4 and ipv6 dhcp servers,
  and pass kernel command line with:
    ip=dhcp ip6=dhcp

  [Regression Potential]
  Regression seems unlikely as this is relaxing a check.  Where previously
  an exception would have been raised, cloud-init will now go on.

  So it seems most likely, something that didn't work before (due to raised
  exception) would now still not work, but with failures.  That is not
  expected, but that would likely be where regressions were found.

  === End SRU Template ===

  In changes made under bug 1621615 (specifically a1cdebdea), we now
  expect that there may be a 'ip6=' argument on the kernel command line.
  The changes made did not test the case where there is 'ip6=' and no
  'ip='.

  The code currently will return with no network configuration found if
  there is only ip6=...

  Related bugs:
   * bug 1621615: network not configured when ipv6 netbooted into cloud-init
   * bug 1621507: initramfs-tools configure_networking() fails to dhcp IPv6 addresses
   * bug 1635716: Can't bring up a machine on a dual network (ipv4 and ipv6)

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