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I'm currently trying to get a openstack deployment working by using MAAS with 9 nodes and juju. To do this I found this guide, working with ubuntu 12.04 LTS and followed it as good as I can.

After a vigorous amount of trial and error I finally got to the point where I'm supposed to deploy nova-volume using the "custom" config file. However, when my node is started and shows up as running in the juju status report the service reports the installation failed. I'm trying to install with juju jitsu by the way. I think it has something to do with the following statement in the openstack.cfg file:

nova-volume:
# This must be a free block device that is writable on the nova-volume host.
block-device: "xvdb"
overwrite: "true"

I did some research and found that (at least I think) this refers to a Xen Virtual Drive/Device, and because the device is not present on the node it's being deployed to, the installation fails. What I don't understand is how am I supposed to have such a block device available on a machine which was completely managed by MAAS. Does anyone here have any experience with this and knows of a way to solve this or am I missing something big here. Some kind of missing link between the MAAS and a separate XEN host? My MAAS server is running Ubuntu 12.04LTS Server.

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1 Answer 1

You can set the block device to be a file location. If you look at the nova-volume charm readme here: http://jujucharms.com/charms/precise/nova-volume

You can see that you can set the block device to /path/to/file[|size]

So, you can configure your openstack.cfg file with something like:

nova-volume:
    # This must be a free block device that is writable on the nova-volume host.
    block-device: "/var/lib/nova-volume/volume-1.img|100G"
    overwrite: "true"

This avoids the necessity to have a separate hardware device, but of course, is not ideal for a high performance production environment.

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