[Bug 1470580] [NEW] unprivileged lxc containers fails with custom bridge

[god]

Public bug reported:

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

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "lxc-user.log"
   https://bugs.launchpad.net/bugs/1470580/+attachment/4423002/+files/lxc-user.log

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to lxc in Ubuntu.
https://bugs.launchpad.net/bugs/1470580

Title:
  unprivileged lxc containers fails with custom bridge

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1470580/+subscriptions