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[Pau Iranzo <1472369@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1468611 ***
    https://bugs.launchpad.net/bugs/1468611

Hi,

I've run into the same problem and haven't found any useful answers so far. However, doing exactly the opposite explained here:
https://community.flockport.com/topic/25/lxc-net-fails-to-create-bridge-on-ubuntu-server-14-04-1

It works for me.

So, temporary solution:

$ vim /etc/dnsmasq.d/lxc

Comment all lines:

# Tell any system-wide dnsmasq instance to make sure to bind to interfaces
# instead of listening on 0.0.0.0
# WARNING: changes to this file will get lost if lxc is removed.
#bind-interfaces
#except-interface=lxcbr0

So the file ends up doing nothing. After restarting the system, I get my
lxcbr0 back and I can access to my lxc machines again.

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https://bugs.launchpad.net/bugs/1472369

Title:
  lxcbr0 missing after starting lxc-net.service

Status in lxc package in Ubuntu:
  New

Bug description:
  1. % lsb_release -rd 
  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10

  2. % apt-cache policy lxc
  lxc:
    Installed: 1.1.2-0ubuntu3
    Candidate: 1.1.2-0ubuntu3
    Version table:
   *** 1.1.2-0ubuntu3 0
          500 http://us.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
          100 /var/lib/dpkg/status

  3.  sudo systemctl restart lxc-net.service should bring up lxcbr0
  bridge device

  4. lxcbr0 device is not present after starting/restarting lxc-
  net.service

  (kriek) ~ % sudo systemctl restart lxc-net.service
  (kriek) ~ % sudo systemctl status -l lxc-net.service
  ● lxc-net.service - LXC network bridge setup
     Loaded: loaded (/lib/systemd/system/lxc-net.service; enabled; vendor preset: enabled)
     Active: active (exited) since Tue 2015-07-07 13:33:15 CDT; 3s ago
    Process: 1764 ExecStop=/usr/lib/x86_64-linux-gnu/lxc/lxc-net stop (code=exited, status=0/SUCCESS)
    Process: 1769 ExecStart=/usr/lib/x86_64-linux-gnu/lxc/lxc-net start (code=exited, status=0/SUCCESS)
   Main PID: 1769 (code=exited, status=0/SUCCESS)

  Jul 07 13:33:15 kriek systemd[1]: Starting LXC network bridge setup...
  Jul 07 13:33:15 kriek lxc-net[1769]: dnsmasq: cannot read /etc/dnsmasq.conf: No such file or directory
  Jul 07 13:33:15 kriek systemd[1]: Started LXC network bridge setup.
  (kriek) ~ % brctl show
  bridge name	bridge id		STP enabled	interfaces
  virbr0		8000.5254005821b0	yes		virbr0-nic
  (kriek) ~ % ifconfig lxcbr0
  lxcbr0: error fetching interface information: Device not found

  My wily system does not have a dnsmasq.conf  and without one which includes the conf-dir = /etc/dnsmasq.d
  directive, then lxc-net does not come up.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: lxc 1.1.2-0ubuntu3
  ProcVersionSignature: Ubuntu 4.0.0-4.6-generic 4.0.7
  Uname: Linux 4.0.0-4-generic x86_64
  ApportVersion: 2.17.3-0ubuntu4
  Architecture: amd64
  Date: Tue Jul  7 13:35:41 2015
  InstallationDate: Installed on 2015-05-10 (57 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)
  defaults.conf:
   lxc.network.type = veth
   lxc.network.link = lxcbr0
   lxc.network.flags = up
   lxc.network.hwaddr = 00:16:3e:xx:xx:xx

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