[Bug 1734167] Re: DNS doesn't work in no-cloud as launched by ubuntu

[Brian Murray]

Hello Michael, or anyone else affected,

Accepted systemd into artful-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/234-2ubuntu12.3 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-artful to verification-done-artful. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-artful. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: systemd (Ubuntu Artful)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-artful

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https://bugs.launchpad.net/bugs/1734167

Title:
  DNS doesn't work in no-cloud as launched by ubuntu

Status in cloud-init:
  Confirmed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in cloud-init source package in Zesty:
  Fix Released
Status in systemd source package in Zesty:
  Fix Released
Status in cloud-init source package in Artful:
  Confirmed
Status in systemd source package in Artful:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * resolved does not start early enough in the boot-process preventing
  DNS resolution to be operational during early boot, for example as
  required by special early stages of cloud-init, resulting in failure
  to boot / provision the instance fully.

  [Test Case]

   * Boot container or a VM with a nocloud-net data source, and a URL pointing to the datasource as explained below
   * Observe that boot completes and provisioning is successful
   * Check that there are no dns-resolution errors in the cloud-init log / boot log

  [Regression Potential]

   * starting resolved earlier may prevent it from connecting to dbus,
  and may require a restart later on when re-triggered over dbus. This
  is on artful only, as in bionic resolved has gained ability to
  reconnected to dbus post-start. Backporting that, however, is too
  large for an SRU as it requires sd-bus changes.

  [Other Info]
   
   * Original bug report.

  I use no-cloud to test the kernel in CI (I am maintainer of the bcache
  subsystem), and have been running it successfully under 16.04 cloud
  images from qemu, using a qemu command that includes:

  -smbios "type=1,serial=ds=nocloud-
  net;s=https://raw.githubusercontent.com/mlyle/mlyle/master/cloud-
  metadata/linuxtst/"

  As documented here:

  http://cloudinit.readthedocs.io/en/latest/topics/datasources/nocloud.html

  Under the new 17.10 cloud images, this doesn't work: the network comes
  up, but name resolution doesn't work-- /etc/resolv.conf is a symlink
  to a nonexistent file at this point of the boot and systemd-resolved
  is not running.  When I manually hack /etc/resolv.conf in the cloud
  image to point to 4.2.2.1 it works fine.

  I don't know if nameservice not working is by design, but it seems
  like it should work.  The documentation states:

  "With ds=nocloud-net, the seedfrom value must start with http://,
  https:// or ftp://"

  And https is not going to work for a raw IP address.

  Related bugs:
   * bug 1734939: #include fails silently.

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