The keystone charm deploys Keystone, the core OpenStack service that provides API client authentication, service discovery, and distributed multi-tenant authorization. The charm works alongside other Juju-deployed OpenStack services.
This section covers common and/or important configuration options. See file
config.yaml for the full list of options, along with their descriptions and
default values. See the Juju documentation for details
on configuring applications.
openstack-origin option states the software sources. A common value is an
OpenStack UCA release (e.g. 'cloud:bionic-ussuri' or 'cloud:focal-victoria').
See Ubuntu Cloud Archive. The underlying host's existing apt
sources will be used if this option is not specified (this behaviour can be
explicitly chosen by using the value of 'distro').
Keystone is often containerised. Here a single unit is deployed to a new container on machine '1':
juju deploy --to lxd:1 keystone
Now connect the keystone application to an existing cloud database. The database application is determined by the series. Prior to focal percona-cluster is used, otherwise it is mysql-innodb-cluster. In the example deployment below mysql-innodb-cluster has been chosen.
juju deploy mysql-router keystone-mysql-router juju add-relation keystone-mysql-router:db-router mysql-innodb-cluster:db-router juju add-relation keystone-mysql-router:shared-db keystone:shared-db
keystone:shared-db relation added at deployment time stores the Keystone
admin password in the cloud database. By default this password is generated
randomly but, for testing purposes, can be set via the
configuration option. This option can also be used to view and change the
This section covers Juju actions supported by the charm.
Actions allow specific operations to be performed on a per-unit basis. To
display action descriptions run
juju actions keystone. If the charm is not
deployed then see file
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.
Communication between Keystone and cloud services (as well as the OpenStack client) can be encrypted with TLS. Keystone also publishes API endpoints for the cloud (e.g. cinder, glance, keystone, neutron, nova, and placement), which may be TLS-based.
There are two methods for managing TLS keys and certificates:
Vault can set up private keys and server certificates for an application. It can also store a central CA certificate for the cloud. See the vault charm for more information.
Vault is the recommended method and is what will be covered here.
The private key and server certificate (and its signing) are enabled via a relation made to the vault application:
juju add-relation keystone:certificates vault:certificates
When Keystone is TLS-enabled every application that talks to Keystone (i.e. there exists a relation between the two) must be in possession of the signing CA cert. This is achieved by adding a relation between the application and Vault. Doing so will also encrypt the application's own endpoint. For example, the Placement API:
juju add-relation placement:certificates vault:certificates
Vault will issue certificates to the application and Keystone will update the corresponding API endpoint from HTTP to HTTPS.
Note: API endpoints can be listed with
openstack catalog list.
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 keystone --bind \ "public=public-space \ internal=internal-space \ admin=admin-space \ shared-db=internal-space"
Alternatively, these can also be provided as part of a Juju native bundle configuration:
keystone: charm: cs:xenial/keystone num_units: 1 bindings: 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 (see MAAS spaces).
Note: Existing deployments using
os\-\*-networkconfiguration options will continue to function; these options are preferred over any network space binding provided if set.
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 keystone policyd-override=overrides.zip juju config keystone use-policyd-override=true
The charm supports the following relations. They are primarily of use to developers:
identity-admin: Used by charms to obtain the credentials for the admin
user. This is intended for charms that automatically provision users,
identity-credentials: Used by charms to obtain Keystone credentials without
creating a service catalogue entry. Set 'username' only on the relation and
Keystone will set defaults and return authentication details. Possible
username: Username to be created.
project: Project (tenant) name to be created. Defaults to service's project.
requested_roles: Comma-delimited list of roles to be created.
requested_grants: Comma-delimited list of roles to be granted. Defaults to Admin role.
domain: Keystone v3 domain the user will be created in. Defaults to the Default domain.
identity-notifications: Used to broadcast messages to services listening on
the corresponding interface.
identity-service: Used by API endpoints to request an entry in the Keystone
service catalogue and the endpoint template catalogue.
identity-servicerelation is not used by Horizon (see
When a relation is established Keystone receives the following data from the requesting API endpoint:
Keystone verifies that the requested service is supported (the list of supported services should remain updated). The following will occur for a supported service:
The API endpoint receives the token and is informed of the ports that Keystone is listening on.
keystone-service: Used only by Horizon. Horizon requests its configured
default role and Keystone responds with a token. Horizon also receives the
authentication and admin ports on which Keystone is listening.
nrpe-external-master: Used to generate Nagios checks.
The below topics are covered in the OpenStack Charms Deployment Guide.
Security compliance: Shows how to use the
password-security-compliance charm option to set Keystone's security
Token support: Provides a background of Keystone keys
and tokens. It explains key rotation, and how to use the
token-expiration charm options.
The OpenStack Charms project maintains two documentation guides:
Please report bugs on Launchpad.