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[Launchpad Bug Tracker <1728152@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
17.1-27-geb292c18-0ubuntu1~16.04.1

---------------
cloud-init (17.1-27-geb292c18-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * New upstream snapshot.
    - EC2: Limit network config to fallback nic, fix local-ipv4 only
      instances. (LP: #1728152)
    - Gentoo: Use "rc-service" rather than "service". [Carlos Konstanski]

cloud-init (17.1-25-g17a15f9e-0ubuntu1~16.04.1) xenial-proposed;
urgency=medium

  * New upstream snapshot.
    - resizefs: Fix regression when system booted with root=PARTUUID=
      (LP: #1725067)
    - tools: make yum package installation more reliable
    - citest: fix remaining warnings raised by integration tests.
    - citest: show the class actual class name in results.
    - ntp: fix config module schema to allow empty ntp config
      (LP: #1724951)
    - tools: disable fastestmirror if using proxy [Joshua Powers]

cloud-init (17.1-18-gd4f70470-0ubuntu1~16.04.2) xenial-proposed;
urgency=medium

  * cherry-pick 41152f1: schema: Log debug instead of warning when
    jsonschema is absent (LP: #1724354)

cloud-init (17.1-18-gd4f70470-0ubuntu1~16.04.1) xenial-proposed;
urgency=medium

  * drop the following cherry picks, now incorporated in snapshot.
    + debian/patches/cpick-a2f8ce9c-Do-not-provide-systemd-fsck-drop...
  * debian/copyright: dep5 updates, reorganize, add Apache 2.0 license.
    (LP: #1718681)
  * debian/control: drop dependency on python3-prettytable
  * debian/rules: install rsyslog file with 0644 mode instead of 0755.
  * debian/rules, debian/apport-launcher.py: add an apport hook. (LP: #1607345)
  * New upstream snapshot. (LP: #1721847)
    - simpletable: Fix get_string method to return table-formatted string
    - net: Handle bridge stp values of 0 and convert to boolean type
      [Chad Smith]
    - tools: Give specific --abbrev=8 to "git describe"
    - network: bridge_stp value not always correct [Ryan Harper]
    - tests: re-enable tox with nocloud-kvm support [Joshua Powers]
    - systemd: remove limit on tasks created by cloud-init-final.service.
      [Robert Schweikert]
    - suse: Support addition of zypper repos via cloud-config.
      [Robert Schweikert]
    - tests: Combine integration configs and testcases [Joshua Powers]
    - Azure, CloudStack: Support reading dhcp options from systemd-networkd.
      [Dimitri John Ledkov]
    - packages/debian/copyright: remove mention of boto and MIT license
    - systemd: only mention Before=apt-daily.service on debian based distros.
      [Robert Schweikert]
    - Add missing simpletable and simpletable tests for failed merge
      [Chad Smith]
    - Remove prettytable dependency, introduce simpletable [Andrew Jorgensen]
    - debian/copyright: dep5 updates, reorganize, add Apache 2.0 license.
      [Joshua Powers]
    - tests: remove dependency on shlex [Joshua Powers]
    - AltCloud: Trust PATH for udevadm and modprobe.
    - DataSourceOVF: use util.find_devs_with(TYPE=iso9660)
      [Ryan Harper]
    - tests: remove a temp file used in bootcmd tests.
    - release 17.1
    - doc: document GCE datasource. [Arnd Hannemann]
    - suse: updates to templates to support openSUSE and SLES.
      [Robert Schweikert]
    - suse: Copy sysvinit files from redhat with slight changes.
      [Robert Schweikert]
    - docs: fix sphinx module schema documentation [Chad Smith]
    - tests: Add cloudinit package to all test targets [Chad Smith]
    - Makefile: No longer look for yaml files in obsolete ./bin/.
    - tests: fix ds-identify unit tests to set EC2_STRICT_ID_DEFAULT.
    - ec2: Fix maybe_perform_dhcp_discovery to use /var/tmp as a tmpdir
      [Chad Smith]
    - Azure: wait longer for SSH pub keys to arrive.
      [Paul Meyer]
    - GCE: Fix usage of user-data.
    - cmdline: add collect-logs subcommand. [Chad Smith]
    - CloudStack: consider dhclient lease files named with a hyphen.
    - resizefs: Drop check for read-only device file, do not warn on
      overlayroot. [Chad Smith]
    - tests: Enable the NoCloud KVM platform [Joshua Powers]
    - resizefs: pass mount point to xfs_growfs [Dusty Mabe]
    - vmware: Enable nics before sending the SUCCESS event. [Sankar Tanguturi]
    - cloud-config modules: honor distros definitions in each module
      [Chad Smith]
    - chef: Add option to pin chef omnibus install version
      [Ethan Apodaca]
    - tests: execute: support command as string [Joshua Powers]
    - schema and docs: Add jsonschema to resizefs and bootcmd modules
      [Chad Smith]
    - tools: Add xkvm script, wrapper around qemu-system [Joshua Powers]
    - vmware customization: return network config format
      [Sankar Tanguturi]
    - Ec2: only attempt to operate at local mode on known platforms.
    - Use /run/cloud-init for tempfile operations.
    - ds-identify: Make OpenStack return maybe on arch other than intel.
    - tests: mock missed openstack metadata uri network_data.json
      [Chad Smith]
    - relocate tests/unittests/helpers.py to cloudinit/tests
      [Lars Kellogg-Stedman]
    - tox: add nose timer output [Joshua Powers]
    - upstart: do not package upstart jobs, drop ubuntu-init-switch module.
    - tests: Stop leaking calls through unmocked metadata addresses
      [Chad Smith]
    - distro: allow distro to specify a default locale [Ryan Harper]
    - tests: fix two recently added tests for sles distro.
    - url_helper: dynamically import oauthlib import from inside oauth_headers
      [Chad Smith]
    - tox: make xenial environment run with python3.6
    - suse: Add support for openSUSE and return SLES to a working state.
      [Robert Schweikert]
    - GCE: Add a main to the GCE Datasource.
    - ec2: Add IPv6 dhcp support to Ec2DataSource. [Chad Smith]
    - url_helper: fail gracefully if oauthlib is not available
      [Lars Kellogg-Stedman]
    - cloud-init analyze: fix issues running under python 2. [Andrew Jorgensen]
    - Configure logging module to always use UTC time.
      [Ryan Harper]
    - Log a helpful message if a user script does not include shebang.
      [Andrew Jorgensen]
    - cli: Fix command line parsing of coniditionally loaded subcommands.
      [Chad Smith]
    - doc: Explain error behavior in user data include file format.
      [Jason Butz]
    - cc_landscape & cc_puppet: Fix six.StringIO use in writing configs
      [Chad Smith]
    - schema cli: Add schema subcommand to cloud-init cli and cc_runcmd schema
      [Chad Smith]
    - Debian: Remove non-free repositories from apt sources template.
      [Joonas Kylmälä]
    - tools: Add tooling for basic cloud-init performance analysis.
      [Chad Smith]
    - network: add v2 passthrough and fix parsing v2 config with bonds/bridge
      params [Ryan Harper]
    - doc: update capabilities with features available, link doc reference,
      cli example [Ryan Harper]
    - vcloud directory: Guest Customization support for passwords
      [Maitreyee Saikia]
    - ec2: Allow Ec2 to run in init-local using dhclient in a sandbox.
      [Chad Smith]
    - cc_ntp: fallback on timesyncd configuration if ntp is not installable
      [Ryan Harper]
    - net: Reduce duplicate code. Have get_interfaces_by_mac use
      get_interfaces.
    - tests: Fix build tree integration tests [Joshua Powers]
    - sysconfig: Dont repeat header when rendering resolv.conf
      [Ryan Harper]
    - archlinux: Fix bug with empty dns, do not render 'lo' devices.

 -- Chad Smith <chad.smith@xxxxxxxxxxxxx>  Tue, 31 Oct 2017 13:10:51
-0600

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

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https://bugs.launchpad.net/bugs/1728152

Title:
  EC2 IPv4 and IPv6 Dual Stack Does Not work when instance is not
  assigned public IPv4 address

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
Status in cloud-init source package in Zesty:
  Fix Released
Status in cloud-init source package in Artful:
  Fix Released
Status in cloud-init source package in Bionic:
  Fix Released

Bug description:
  === Begin SRU Template ===
  [Impact]
  Support for configuration of IPV6 addresses on the primary network
  interface in EC2 changed behavior of the automatic network configuration.
  This changed behavior in 2 ways:
  a.) Instances with only a private ipv4 address would not get *any* ipv4
  address.

  b.) Instances with multiple NICs attached at boot would get all NICs
  configured. Previously only the primary network interface would be
  configured by cloud-init.

  'b' is not necessarily a bug for Artful.  A new release can bring new
  behavior.  However, the change of behavior was not intended and not desired
  for an SRU.  In an effort to keep this behavior consistent across 16.04+
  we will be changing the behavior of Artful to only configure the primary
  network interface.

  [Test Case]
  To verify this code is fixed for all cases involved:

  1. Verify that instances without public ipv4 get an ipv4 address.
   * Launch an instance on EC2 without a public IPV4 address.
   * Verify the instance has its Ipv4 address configured via ssh and
     checking 'ip' output.

  2. Verify no regression is done to public systems.
   * Launch an instance on EC2 with a public IPV4 address.
   * Verify the instance has its ipv4 address configured.

  3. Verify only the primary NIC is configured (17.10 only)
   * Launch an instance on EC2 with multiple  nics configured.
   * Verify that only the primary nic has configuration by default.

  For each of the above, verification entails inspection of
  network config (/etc/network/interfaces.d/* or /etc/netplan/)
  and also network state ('ip a' output).

  [Regression Potential]
  Regression in this area of code is certainly limited to EC2,
  and most likely limited to network configuration.

  Complete failure would show itself as no networking at all and
  a WARNING or stack trace on the console logs.

  [Other Info]
  Upstream commit at
    https://git.launchpad.net/cloud-init/commit/?id=XXXXXXXXXX

  === End SRU Template ===

  With the following cloud-init configuration:
  system_info:
    network:
      renderers: ['netplan', 'eni', 'sysconfig']

  network:
    version: 2
    ethernets:
      id0:
          match:
              name: e*
          dhcp4: true
          dhcp6: true

  with version  17.1-18-gd4f70470-0ubuntu1 on ami-36a8754c, it writes out the following network configuration:
  # This file is generated from information provided by
  # the datasource.  Changes to it will not persist across an instance.
  # To disable cloud-init's network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      version: 2
      ethernets:
          ens3:
              dhcp6: true
              match:
                  macaddress: 02:14:13:66:8a:66
              set-name: ens3

  ----

  This instance is in a (default) VPC with a private IPv4 address and no
  public IPv4 addresses.

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