Juju in LXC

[Ondrej Kuznik]

Hi all,
a bit of background: running Debian on a not-so-high-spec machine, the
most often suggested way of running Juju (vagrant) has not been the best
experience so far.

The VM eats most of my RAM (the few bits not taken up by Iceweasel
already) and takes ages to do the simplest of things. Yet it has worked
well enough for a while, until I needed relations with the postgresql charm.

That issue turns out to have been fixed since, but given that I already
had to start over with a fresh VM, it was a good time to try and go
native again - with LXC.

According to lazyPower, noone has really tried that, or they haven't
shared their experience yet. He suggested I do so, should I be
successful. So here it comes.

Juju a la Debian, or LXCeption
------------------------------

Ingredients:
- 1 Debian Jessie (a Wheezy with backports might work as well?)
- aptitude install lxc ebtables bridge-utils libvirt-bin debootstrap
- a cup of https://wiki.debian.org/LXC
- a pinch of https://help.ubuntu.com/lts/serverguide/lxc.html#lxc-nesting

If lxc-checkconfig approves of your machine, you can proceed to create
your new container:

lxc-create -n juju-host -t ubuntu-cloud -- --release trusty

Then, as per the Ubuntu documentation, edit your container config
(/var/lib/lxc/juju-host/config) to include:

lxc.mount.auto = cgroup

Sprinkle with networking of your liking and you can start the machine.
Your Juju is ready to serve!

As expected, it is much snappier and friendly. One gotcha is that,
usually after an environment destroy, the cgroups get unmounted/somehow
disabled in the container and new containers in the nest will not start.
Restarting the juju host container makes that go away.

Maybe that's juju being overzealous when shutting down the its machines?
Can file a bug if anyone thinks it's worth investigating.

Have fun,
Ondrej

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