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[Launchpad Bug Tracker <1621615@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/1621615

Title:
  network not configured when ipv6 netbooted into cloud-init

Status in cloud-init:
  Fix Committed
Status in MAAS:
  In Progress
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-initramfs-tools package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Fix Released
Status in cloud-initramfs-tools source package in Xenial:
  Confirmed
Status in cloud-init source package in Yakkety:
  Confirmed
Status in cloud-initramfs-tools source package in Yakkety:
  Confirmed

Bug description:
  https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/1621507 talks of
  how IPv6 netboot with iscsi root disk doesn't work, blocking IPv6-only
  MAAS.

  After I hand-walked busybox through getting an IPv6 address,
  everything worked just fine until cloud-init couldn't fetch the
  instance data, because it insisted on bringing up the interface in
  IPv4, and there is no IPv4 DHCP on that vlan.

  Please work with initramfs and friends on getting IPv6 netboot to
  actually configure the interface.  This may be as simple as teaching
  it about "inet6 dhcp" interfaces, and bolting the pieces together.
  Note that "use radvd" is not really an option for our use case.

  Related bugs:
   * 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)
   * bug 1639930: initramfs network configuration ignored if only ip6= on kernel command line 

  [Impact]

  It is not possible to enlist, commmission, or deploy with MAAS in an
  IPv6-only environment. Anyone wanting to netboot with a network root
  filesystem in an IPv6-only environment is affected.

  This upload addresses this by accepting, using, and forwarding any
  IPV6* variables from the initramfs boot.  (See
  https://launchpad.net/bugs/1621507)

  [Test Case]

  See Bug 1229458. Configure radvd, dhcpd, and tftpd for your IPv6-only
  netbooting world. Pass the boot process an IPv6 address to fetch
  instance-data from, and see it fail to configure the network.

  [Regression Potential]

  1) If the booting host is in a dual-boot environment, and the
  instance-dat URL uses a hostname that has both A and AAAA RRsets, the
  booting host may try to talk IPv6 to get instance data.  If the
  instance-data providing host is only allowing that to happen over
  IPv4, it will fail. (It also represents a configuraiton issue on the
  providing host...)

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