[Bug 1331019] [NEW] allow setting fixed MAC addresses for juju created LXC containers

[Alexander List]

Public bug reported:

Our environment requires stable IP addresses for LXC containers deployed
to MAAS managed physical machines via juju.

We are smooshing OpenStack infrastructure components (glance, cinder,
rabbitmq-server, swift-proxy, ...) to 3 units each on 3 physical hosts
for HA.

HA enabled services using the hacluster charm require that we specify a
virtual IP via config, but the IP of an LXC container comes from a pool
no matter if MAAS is used for DHCP/DNS management or not. MAC addresses
are randomized by default as well, using /etc/lxc/default.conf on the
host machine.

I suggest allowing the MAC address to be pre-allocated via config, such
that IP and hostname can be pre-allocated via DHCP/DNS as well.

References:

http://manage.jujucharms.com/charms/trusty/hacluster
https://bugs.launchpad.net/ubuntu/+source/maas/+bug/1274947
http://manpages.ubuntu.com/manpages/trusty/man5/lxc.container.conf.5.html

$ lsb_release -rd
Description:	Ubuntu 12.04.4 LTS
Release:	12.04

juju-core version: 1.18.4
Target distro: trusty

** Affects: juju-core (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1331019

Title:
  allow setting fixed MAC addresses for juju created LXC containers

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