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[Serge Hallyn <1474047@xxxxxxxxxxxxxxxxxx>]

Thanks for the report.

This actually isn't a bug.  The lxc.cgroup.devices.allow line allows
your container to create and use the device, but doesn't automatically
create it.  Assuming you are using the defaults with lxc.autodev set,
you can have it be automatically created by either adding a
lxc.mount.entry to bind-mount it from the host to the container, i.e.

lxc.mount.entry = /dev/ppp dev/ppp none bind,optional,create=file

or adding it to a lxc.hook.autodev hook.

If you want to turn this into a feature request for a 'persistent' flag
for lxc-device, that could be useful, though I think there were reasons
we didn't do that.  Please comment if that's what you want, else I'm
marking it invalid.

** Changed in: lxc (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1474047

Title:
  pppoe fails inside container

Status in lxc package in Ubuntu:
  Invalid

Bug description:
  I've created privileged lxc container on ubuntu 15.04 x86_64 (sudo
  lxc-create...) added their ethernet interface connected to dsl modem -
  so far so good: pppoe-discovery from inside the container recognoze
  it, pppoeconf is able to configure it.

  The problem is that the container network fails to start automatically
  during the boot due to missing /dev/ppp device.

  I've added following line to the container config:
  lxc.cgroup.devices.allow = c 108:0 rwm

  On the host device is available:
  ls -alh /dev/ppp
  crw------- 1 root root 108, 0 Jul 13 17:37 /dev/ppp

  But inside the container there's nothing. Even more curious - if I manually call mknod from withing the container than dsl connection is established just fine:
  sudo lxc-attach -n mycontainer -- mknod /dev/ppp c 108 0

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