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[god <1470580@xxxxxxxxxxxxxxxxxx>]

Thanks for clarification! Would be kinda helpful if lxc-start could
print actual numbers (X quota configured for bridge123, Y is in use).
What's the upper limit on those quota numbers? Can I have 100 bridges
with 4000000 interfaces in each?

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https://bugs.launchpad.net/bugs/1470580

Title:
  unprivileged lxc containers fails with custom bridge

Status in lxc package in Ubuntu:
  Confirmed

Bug description:
  Using 15.04 x86_64 with all the updates installed.
  I'd like 2 containers to communicate with each other via bridge interface. For that I've created interface as follows:
  /etc/systemd/network/internalbridge1.netdev:
  [NetDev]
  Name=ibr1
  Kind=bridge

  /etc/lxc/lxc-usernet:
  # USERNAME TYPE BRIDGE COUNT
  x veth ibr1 8

  The 'x' is my username, it's first and only user configured in the
  system so default id map should work fine.

  The container network is configured as follows:
  lxc.network.type = veth
  lxc.network.link = ibr1
  lxc.network.flags = up
  lxc.network.name = internal
  lxc.network.ipv4 = 10.1.8.2/24
  lxc.network.ipv4.gateway = 10.1.8.1

  I've enabled the service and brought the bridge up - showing ok via
  'ip a' and 'brctl show'. Also works fine with priviledged containers.
  However with unpriviledged containers it fails:

  lxc-start -n asterisk -l debug -F --logfile lxc-user.log

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