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[James Johnston <1586869@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If ubuntu-fan is installed inside an unprivileged LXD container (both
host & container are Ubuntu 16.04), it will break networking:

$ journalctl
May 29 23:32:47 sandvich ifup[201]: run-parts: /etc/network/if-up.d/ubuntu-fan exited with return code 1
M
May 29 23:32:47 sandvich ifup[201]: Failed to bring up eth0.
May 29 23:32:47 sandvich systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
May 29 23:32:47 sandvich systemd[1]: Failed to start Raise network interfaces.

I couldn't find any other indication in the log of why it failed.

My networking configuration was configured to get an IP address with
DHCPv6.  That no longer happened after installation of ubuntu-fan.

I ran into this problem when following Stephane Graber's tutorial on
nesting Docker inside LXD: https://www.stgraber.org/2016/04/13/lxd-2-0
-docker-in-lxd-712/

It turns out that ubuntu-fan is recommended by docker.io:
http://packages.ubuntu.com/xenial/docker.io

So a mere "apt-get install docker.io" will also install ubuntu-fan, and
then break networking inside my container.  Easy to skip ubuntu-fan if
you don't need it via "--no-install-recommends" but it's a gotcha if you
follow the above tutorial as-is.

** Affects: ubuntu-fan (Ubuntu)
     Importance: Undecided
         Status: New

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Packages, which is subscribed to ubuntu-fan in Ubuntu.
https://bugs.launchpad.net/bugs/1586869

Title:
  ubuntu-fan breaks networking when installed inside an LXD container

Status in ubuntu-fan package in Ubuntu:
  New

Bug description:
  If ubuntu-fan is installed inside an unprivileged LXD container (both
  host & container are Ubuntu 16.04), it will break networking:

  $ journalctl
  May 29 23:32:47 sandvich ifup[201]: run-parts: /etc/network/if-up.d/ubuntu-fan exited with return code 1
  M
  May 29 23:32:47 sandvich ifup[201]: Failed to bring up eth0.
  May 29 23:32:47 sandvich systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
  May 29 23:32:47 sandvich systemd[1]: Failed to start Raise network interfaces.

  I couldn't find any other indication in the log of why it failed.

  My networking configuration was configured to get an IP address with
  DHCPv6.  That no longer happened after installation of ubuntu-fan.

  I ran into this problem when following Stephane Graber's tutorial on
  nesting Docker inside LXD: https://www.stgraber.org/2016/04/13/lxd-2-0
  -docker-in-lxd-712/

  It turns out that ubuntu-fan is recommended by docker.io:
  http://packages.ubuntu.com/xenial/docker.io

  So a mere "apt-get install docker.io" will also install ubuntu-fan,
  and then break networking inside my container.  Easy to skip ubuntu-
  fan if you don't need it via "--no-install-recommends" but it's a
  gotcha if you follow the above tutorial as-is.

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