Juju Charm - Nova Cloud Controller
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Zuul 3183cd6ff0 Merge "c-h sync - restore proxy env vars for add-apt-repository" 1 week ago
actions Add sync-compute-availability-zones Juju action 2 months ago
charmhelpers c-h sync - restore proxy env vars for add-apt-repository 1 month ago
files Switch the charm to support py3 3 years ago
hooks Merge "Set cross_az_attach setting on cloud-compute relation" 2 weeks ago
lib Update tox.ini files from release-tools gold copy 5 years ago
scripts Sync scripts/. 8 years ago
templates Add region config to [neutron] in nova.conf 8 months ago
tests Test bundles for focal-wallaby and hirsute-wallaby 2 months ago
unit_tests Merge "Set cross_az_attach setting on cloud-compute relation" 2 weeks ago
.gitignore Provide compute nodes with domain information 2 years ago
.gitreview OpenDev Migration Patch 2 years ago
.project Add pydev project 8 years ago
.pydevproject Add missing fetch helper 8 years ago
.stestr.conf Update tox to remove py27 target 3 years ago
.zuul.yaml Switch to Ussuri jobs 2 years ago
LICENSE Re-license charm as Apache-2.0 5 years ago
Makefile Updates for 20.08 cycle start for groovy and libs 1 year ago
README.md Apply HA section template to README 1 year ago
actions.yaml Add sync-compute-availability-zones Juju action 2 months ago
bindep.txt Remove charm-helpers from tests dir and use venv instead 4 years ago
charm-helpers-hooks.yaml Updates to flip all libraries back to master 2 months ago
config.yaml Update worker-multiplier config description 3 months ago
copyright Re-license charm as Apache-2.0 5 years ago
hardening.yaml Add hardening support 5 years ago
icon.svg Update charm icon 4 years ago
metadata.yaml Add impish to metadata.yaml 3 weeks ago
osci.yaml Test bundles for focal-wallaby and hirsute-wallaby 2 months ago
requirements.txt Sync release-tools 6 months ago
revision [ivoks,r=] Add support for setting neutron-alchemy-flags 7 years ago
setup.cfg setup.cfg: Replace dashes with underscores 2 months ago
test-requirements.txt Updates to flip all libraries back to master 2 months ago
tox.ini Sync release-tools 6 months ago



Cloud controller node for OpenStack nova. Contains nova-schedule, nova-api, nova-network and nova-objectstore.

If console access is required then console-proxy-ip should be set to a client accessible IP that resolves to the nova-cloud-controller. If running in HA mode then the public vip is used if console-proxy-ip is set to local. Note: The console access protocol is baked into a guest when it is created, if you change it then console access for existing guests will stop working


High availability

When more than one unit is deployed with the hacluster application the charm will bring up an HA active/active cluster.

There are two mutually exclusive high availability options: using virtual IP(s) or DNS. In both cases the hacluster subordinate charm is used to provide the Corosync and Pacemaker backend HA functionality.

See OpenStack high availability in the OpenStack Charms Deployment Guide for details.


This charm supports the use of Juju Network Spaces, allowing the charm to be bound to network space configurations managed directly by Juju. This is only supported with Juju 2.0 and above.

API endpoints can be bound to distinct network spaces supporting the network separation of public, internal and admin endpoints.

Access to the underlying MySQL instance can also be bound to a specific space using the shared-db relation.

To use this feature, use the --bind option when deploying the charm:

juju deploy nova-cloud-controller --bind \
   "public=public-space \
    internal=internal-space \
    admin=admin-space \

Alternatively, these can also be provided as part of a Juju native bundle configuration:

      charm: cs:xenial/nova-cloud-controller
      num_units: 1
        public: public-space
        admin: admin-space
        internal: internal-space
        shared-db: internal-space

NOTE: Spaces must be configured in the underlying provider prior to attempting to use them.

NOTE: Existing deployments using os-*-network configuration options will continue to function; these options are preferred over any network space binding provided if set.

Default Quota Configuration

This charm supports default quota settings for projects. This feature is only available from OpenStack Icehouse and later releases.

The default quota settings do not overwrite post-deployment CLI quotas set by operators. Existing projects whose quotas were not modified will adopt the new defaults when a config-changed hook occurs. Newly created projects will also adopt the defaults set in the charm's config.

By default, the charm's quota configs are not set and OpenStack projects have the below default values:

quota-instances : 10
quota-cores : 20
quota-ram : 51200
quota-metadata_items : 128
quota-injected_files : 5
quota-injected_file_content_bytes : 10240
quota-injected_file_path_length : 255
quota-key_pairs : 100
quota-server_groups : 10 (available since Juno)
quota-server_group_members : 10 (available since Juno)

SSH knownhosts caching

This section covers the option involving the caching of SSH host lookups (knownhosts) on each nova-compute unit. Caching of SSH host lookups speeds up deployment of nova-compute units when first deploying a cloud, and when adding a new unit.

There is a Boolean configuration key cache-known-hosts that ensures that any given host lookup to be performed just once. The default is true which means that caching is performed.

Note: A cloud can be deployed with the cache-known-hosts key set to false, and be set to true post-deployment. At that point the hosts will have been cached. The key only controls whether the cache is used or not.

If the above key is set, a new Juju action clear-unit-knownhost-cache is provided to clear the cache. This can be applied to a unit, service, or an entire nova-cloud-controller application. This would be needed if DNS resolution had changed in an existing cloud or during a cloud deployment. Not clearing the cache in such cases could result in an inconsistent set of knownhosts files.

This action will cause DNS resolution to be performed (for unit/service/application), thus potentially triggering a relation-set on the nova-cloud-controller unit(s) and subsequent changed hook on the related nova-compute units.

The action is used as follows, based on unit, service, or application, respectively:

juju run-action nova-cloud-controller/0 clear-unit-knownhost-cache target=nova-compute/2
juju run-action nova-cloud-controller/0 clear-unit-knownhost-cache target=nova-compute
juju run-action nova-cloud-controller/0 clear-unit-knownhost-cache

In a high-availability setup, the action must be run on all nova-cloud-controller units.

Policy Overrides

Policy overrides is an advanced feature that allows an operator to override the default policy of an OpenStack service. The policies that the service supports, the defaults it implements in its code, and the defaults that a charm may include should all be clearly understood before proceeding.

Caution: It is possible to break the system (for tenants and other services) if policies are incorrectly applied to the service.

Policy statements are placed in a YAML file. This file (or files) is then (ZIP) compressed into a single file and used as an application resource. The override is then enabled via a Boolean charm option.

Here are the essential commands (filenames are arbitrary):

zip overrides.zip override-file.yaml
juju attach-resource nova-cloud-controller policyd-override=overrides.zip
juju config nova-cloud-controller use-policyd-override=true

See appendix Policy Overrides in the OpenStack Charms Deployment Guide for a thorough treatment of this feature.


Please report bugs on Launchpad.

For general charm questions refer to the OpenStack Charm Guide.