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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Also affects: ubuntu-fan (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-fan (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-fan (Ubuntu Zesty)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1732717

Title:
  docker test broken by systemd-resolv environment

Status in ubuntu-fan package in Ubuntu:
  In Progress
Status in ubuntu-fan source package in Xenial:
  New
Status in ubuntu-fan source package in Zesty:
  New
Status in ubuntu-fan source package in Artful:
  New

Bug description:
  Inside a docker container DNS lookups are routed to 127.0.0.11:53 which is provided by the docker environment in some way. The real DNS service is taken from the hosts /etc/resolv.conf. The docker man page claims that selecting a good automatic default would not work if the hosts uses local resolvers (127.0.0.0/8).
  Since switching to netplan/systemd-resolvd there is only a local resolver (127.0.0.53) added to /etc/resolv.conf on the host. Surprisingly this does not seem to be an issue for an artful(or later) VM running on my own local desktop. But in the Canonical CI environment DNS lookups fail inside a docker container.

  SRU Justification:

  Impact: DNS lookups inside docker containers can fail if the host
  environment is set up to only use a local resolver. The built-in
  docker test of fanatic will always fail in that case.

  Fix: Add code to built-in tests which detect systemd-resolvd being in
  use and pass the IP address which systemd-resolv is using as forwarder
  with the --dns option to the docker run command.

  Testcase:
    - If the test host is using systemd-resolvd as its primary DNS
      server, there will be the following message in the test log:
        local docker test: *** Using DNS override ***
            --dns=<ip>
    - Otherwise no message is printed.
    - For all cases docker ADT test should (continue to) pass

  Risk of regression: minimal, only testing affected which is run as ADT
  tests.

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