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[James Page <james.page@xxxxxxxxxx>]

Things appear to be somewhat random; however setting the
multicast_querier flag to 1 resulted in all my clustered spring back to
life:

for i in `seq 0 10`; do juju ssh $i "echo -n 1 | sudo tee
/sys/devices/virtual/net/juju-br0/bridge/multicast_querier"; done

Juju creates a bridge where this is not enabled by default.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1402763

Title:
  Multicast traffic not propating correctly over linux bridge

Status in linux package in Ubuntu:
  Invalid
Status in lxc package in Ubuntu:
  Confirmed

Bug description:
  There's a lot of supposition in the title of this bug but its
  currently my best guess.

  In this deployment, I have a number of services running in LXC
  containers across multiple physical hosts; each service is clustered
  across three units, all on separate physical hosts, using corosync and
  pacemaker; when using multicast to support cluster communication, I
  occasionally see a container drop out of the cluster and use its
  isolation response (to shutdown all managed services); when using
  unicast I've not yet see this same problem.

  LXC containers are bridged to the main physical network using a linux
  bridge:

    eth0 <-> juju-br0 <-> vethXXX <-> | vethXXX |

  All MTU's are standard (1500).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lxc 1.0.6-0ubuntu0.1
  ProcVersionSignature: User Name 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  Date: Mon Dec 15 17:20:08 2014
  ProcEnviron:
   TERM=screen-bce
   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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