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[Launchpad Bug Tracker <1798424@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init - 18.4-0ubuntu1~16.04.2

---------------
cloud-init (18.4-0ubuntu1~16.04.2) xenial; urgency=medium

  * cherry-pick 1d5e9aef: azure: Add apply_network_config option to
    disable network (LP: #1798424)
  * debian/patches/openstack-no-network-config.patch
    add patch to default Azure apply_network_config to False. Only
    fallback network config on eth0 is generated by cloud-init. IMDS
    network_config is ignored.

cloud-init (18.4-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * drop the following cherry-picks now included:
    + cpick-3cee0bf8-oracle-fix-detect_openstack-to-report-True-on
  * refresh patches:
   + debian/patches/azure-use-walinux-agent.patch
   + debian/patches/openstack-no-network-config.patch
  * refresh patches:
   + debian/patches/ds-identify-behavior-xenial.patch
  * New upstream release. (LP: #1795953)
    - release 18.4
    - tests: allow skipping an entire cloud_test without running.
    - tests: disable lxd tests on cosmic
    - cii-tests: use unittest2.SkipTest in ntp_chrony due to new deps
    - lxd: adjust to snap installed lxd.
    - docs: surface experimental doc in instance-data.json
    - tests: fix ec2 integration tests. process meta_data instead of meta-data
    - Add support for Infiniband network interfaces (IPoIB). [Mark Goddard]
    - cli: add cloud-init query subcommand to query instance metadata
    - tools/tox-venv: update for new features.
    - pylint: ignore warning assignment-from-no-return for _write_network
    - stages: Fix bug causing datasource to have incorrect sys_cfg.
    - Remove dead-code _write_network distro implementations.
    - net_util: ensure static configs have netmask in translate_network result
      [Thomas Berger]
    - Fall back to root:root on syslog permissions if other options fail.
      [Robert Schweikert]
    - tests: Add mock for util.get_hostname. [Robert Schweikert]
    - ds-identify: doc string cleanup.
    - OpenStack: Support setting mac address on bond. [Fabian Wiesel]
    - bash_completion/cloud-init: fix shell syntax error.
    - EphemeralIPv4Network: Be more explicit when adding default route.
    - OpenStack: support reading of newer versions of metdata.
    - OpenStack: fix bug causing 'latest' version to be used from network.
    - user-data: jinja template to render instance-data.json in cloud-config
    - config: disable ssh access to a configured user account
    - tests: print failed testname instead of docstring upon failure
    - tests: Disallow use of util.subp except for where needed.
    - sysconfig: refactor sysconfig to accept distro specific templates paths
    - Add unit tests for config/cc_ssh.py [Francis Ginther]
    - Fix the built-in cloudinit/tests/helpers:skipIf
    - read-version: enhance error message [Joshua Powers]
    - hyperv_reporting_handler: simplify threaded publisher
    - VMWare: Fix a network config bug in vm with static IPv4 and no gateway.
      [Pengpeng Sun]
    - logging: Add logging config type hyperv for reporting via Azure KVP
      [Andy Liu]
    - tests: disable other snap test as well [Joshua Powers]
    - tests: disable snap, fix write_files binary [Joshua Powers]
    - Add datasource Oracle Compute Infrastructure (OCI).
    - azure: allow azure to generate network configuration from IMDS per boot.
    - Scaleway: Add network configuration to the DataSource [Louis Bouchard]
    - docs: Fix example cloud-init analyze command to match output.
      [Wesley Gao]
    - netplan: Correctly render macaddress on a bonds and bridges when
      provided.
    - tools: Add 'net-convert' subcommand command to 'cloud-init devel'.
    - redhat: remove ssh keys on new instance.
    - Use typeset or local in profile.d scripts.
    - OpenNebula: Fix null gateway6 [Akihiko Ota]
    - oracle: fix detect_openstack to report True on OracleCloud.com DMI data
    - tests: improve LXDInstance trying to workaround or catch bug.
    - update_metadata re-config on every boot comments and tests not quite
      right [Mike Gerdts]
    - tests: Collect build_info from system if available.
    - pylint: Fix pylint warnings reported in pylint 2.0.0.
    - get_linux_distro: add support for rhel via redhat-release.
    - get_linux_distro: add support for centos6 and rawhide flavors of redhat
    - tools: add '--debug' to tools/net-convert.py
    - tests: bump the version of paramiko to 2.4.1.

 -- Chad Smith <chad.smith@xxxxxxxxxxxxx>  Wed, 17 Oct 2018 12:51:09
-0600

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

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https://bugs.launchpad.net/bugs/1798424

Title:
  Xenial Azure: Make generation of network config from IMDS  hotplug
  scripts configurable opt-in

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

Bug description:
  === Begin SRU Template ===
  [Impact]
  By default, Xenial needs to rely on existing cloud image hotplug scripts and only generate fallback network config (dhcp on eth0) by default. If consumers want to generate dynamic network from Azure's IMDS service, thus removing cloud image hotplug scripts, then a datasource configuration option is surfaced.

  
  [Test Case]
  1. Deploy stock Xenial cloud image
  2. upgrade cloud-init -proposed
  3. Run cloud-init clean --reboot --logs
  4. Confirm that network is not sourced from IMDS content and hotplug scripts still exist
  5. Add datasource configuration setting Azure: apply_network_config: true
  6. Run cloud-init clean --reboot --logs
  7.  Confirm that network is sourced from IMDS and hotplug scripts are removed.

  
  [Regression Potential]

  [Other Info]
  Upstream commit at
    https://git.launchpad.net/cloud-init/commit/?id=15a75ea1

  === End SRU Template ===

  
  === Original Description ===

  
  cloud-init v. 18.4-0ubuntu1~16.04.1 in -proposed automatically renders network configuration from Azure's IMDS by default instead of fallback config of dhcp on eth0. This represents a difference in behavior from current Xenial.

  On Xenial Azure, Ubuntu cloud images have udev scripts to handle
  network hotplug. Azure datasource has the ability to read full network
  config from their IMDS service and render hotplugged devices as well
  as remove the cloud-image default scripts.

  Make the cloud-init hotplug behavior configurable and default it to
  off in Xenial.

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