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The Ubuntu OpenStack HA reference architecture is a current, best practice deployment of OpenStack on Ubuntu 12.04 using a combination of tools and HA techniques to deliver high availability across an OpenStack deployment.

The Ubuntu OpenStack HA reference architecture has been developed on Ubuntu 12.04 LTS, using the Ubuntu Cloud Archive for OpenStack Grizzly.

Juju Deployment

Before you start

Juju + MAAS

The majority of OpenStack deployments are implemented on physical hardware; Juju uses MAAS (Metal-as-a-Service) to deploy Charms onto physical service infrastructure.

Its worth reading up on how to setup MAAS and Juju for your physical server environment prior to trying to deploy the Ubuntu OpenStack HA reference architecture using Juju.


All configuration options should be placed in a file named 'config.yaml'; this is the default file that juju will use from the current working directory.


Although all of the charms to support deployment of OpenStack are available from the Juju Charm Store, its worth branching the bzr branches that support them locally; this means that if you need to tweak a charm for your specific deployment, its much easier.

<VOID 1> script to branch all required charms.

Base Services



Ceph is a key infrastructure component of the Ubuntu OpenStack HA reference architecture; it provides network accessible, resilient block storage to MySQL and RabbitMQ to support HA, as well as providing an natively resilient back-end for block storage (through Cinder) and for image storage (through Glance).


A Ceph deployment will typically consist of both Ceph Monitor (MON) Nodes (responsible for mapping the topology of a Ceph storage cluster) and Ceph Object Storage Device (OSD) Nodes (responsible for storage data on devices). Some basic configuration is required to support deployment of Ceph using the Juju Charms for Ceph:

  fsid: '6547bd3e-1397-11e2-82e5-53567c8d32dc'
  monitor-count: 3
  monitor-secret: 'AQCXrnZQwI7KGBAAiPofmKEXKxu5bUzoYLVkbQ=='
  osd-devices: '/dev/vdb'
  osd-reformat: 'yes'
  source: 'cloud:precise-updates/grizzly'
  osd-devices: '/dev/vdb'
  osd-reformat: 'yes'
  source: 'cloud:precise-updates/grizzly'

In this example, Ceph is configured with the provided fsid and secret (these should be unique for your environment) and will use the '/dev/vdb' block device if found for object storage. Ceph is being sourced ('source') from the Ubuntu Cloud Archive for Grizzly to ensure we get the latest features.

The Ceph MON function is provided by the 'ceph' charm; as the monitor-count is set to '3' Ceph will not bootstrap itself and start responding to requests from clients until at least 3 service units have joined the ceph service. Note that the ceph charm will also slurp up and run OSD's on any available storage; for large deployments you might not want todo this but for proof-of-concept work its OK to just run with storage provided directly via the ceph service.

Additional storage is provided by the 'ceph-osd' charm; this allows additional service units to be spun up which purely provide object storage. Recommended for larger deployments.


First, deploy the ceph charm with a unit count of 3 to build the Ceph MON cluster:

juju deploy -n 3 local:ceph

and then deploy some additional object storage nodes using the ceph-osd charm and relate them to the cluster.

juju deploy -n 3 local:ceph-osd
juju add-relation ceph ceph-osd

All of the above commands can be run in series with no pauses; the charms are clever enough to figure things out in the correct order.


 u'mysql': {u'vip': u'', u'vip_cidr': u'19'},
 u'rabbitmq-server': {u'vip': u'', u'vip_cidr': u'19'}}

juju deploy -n 2 local:rabbitmq-server rabbitmq-server
juju deploy -n 2 local:mysql mysql
juju deploy local:hacluster mysql-hacluster
juju deploy local:hacluster rabbitmq-hacluster
juju add-relation mysql ceph
juju add-relation mysql mysql-hacluster
juju add-relation rabbitmq-server ceph
juju add-relation rabbitmq-server rabbitmq-hacluster