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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Further debugging: /etc/init.d/networking just gets redirected through
/lib/lsb/init-functions.d/40-systemd. This gets closer to the problem:

networking.service - LSB: Raise network interfaces.
   Loaded: loaded (/etc/init.d/networking)
  Drop-In: /run/systemd/generator/networking.service.d
           `-50-insserv.conf-$network.conf
   Active: active (exited) since Mon 2014-09-29 13:15:31 UTC; 41s ago
  Process: 405 ExecStart=/etc/init.d/networking start (code=exited, status=0/SUCCESS)

Sep 29 13:15:31 localhost.localdomain dhclient[486]: For info, please visit https://www.isc.org/software/dhcp/
Sep 29 13:15:31 localhost.localdomain networking[405]: For info, please visit https://www.isc.org/software/dhcp/
Sep 29 13:15:31 localhost.localdomain dhclient[486]: 
Sep 29 13:15:31 localhost.localdomain networking[405]: Cannot find device "eth0"
Sep 29 13:15:31 localhost.localdomain networking[405]: Error getting hardware address for "eth0": No such device
Sep 29 13:15:31 localhost.localdomain networking[405]: Failed to bring up eth0.
Sep 29 13:15:31 localhost.localdomain networking[405]: ...done.
Sep 29 13:15:31 localhost.localdomain systemd[1]: Started LSB: Raise network interfaces..
Sep 29 13:15:31 localhost.localdomain ntpdate[566]: Can't find host ntp.ubuntu.com: Name or service not known (-2)
Sep 29 13:15:31 localhost.localdomain ntpdate[566]: no servers can be used, exiting

Running "sudo systemctl start networking.service" manually works, so
somehow this is running at a time when there's no eth0 yet. This also
explains why adding --allow=auto to the job works, as then it gets re-
run when eth0 is detected.

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https://bugs.launchpad.net/bugs/1374521

Title:
  networking.service races with kernel interface detection

Status in “systemd” package in Ubuntu:
  New

Bug description:
  /lib/systemd/system/ifup@.service specifies:

    ExecStart=/sbin/ifup --allow=hotplug %I

  This really needs to be:

    ExecStart=/sbin/ifup --allow=auto %I

  Since otherwise, for systems that don't use network-manager, the
  service will only bring up interfaces which have specified "allow-
  hotplug $if" in /etc/network/interfaces*.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: systemd 208-8ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-17.23-generic 3.16.3
  Uname: Linux 3.16.0-17-generic x86_64
  ApportVersion: 2.14.7-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Sep 26 16:54:12 2014
  InstallationDate: Installed on 2014-04-11 (167 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140409)
  SourcePackage: systemd
  UpgradeStatus: Upgraded to utopic on 2014-05-08 (141 days ago)

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