Horizon’s settings tend to fall into three categories:
What follows is an overview of the Horizon and OpenStack-specific settings and a few notes on the Django-related settings.
Note
Prior to the Essex release of Horizon there were settings which controlled whether features such as Object Storage/Swift or Networking/Quantum would be enabled in the OpenStack Dashboard. This code has beenlong-since removed and those pre-Essex settings have no impact now.
In Essex and later, the Service Catalog returned by the Identity Service after a user has successfully authenticated determines the dashboards and panels that will be available within the OpenStack Dashboard. If you are not seeing a particular service you expected make sure your Service Catalog is configured correctly.
The following options are available in order to configure/customize the behavior of your Horizon installation. All of them are contained in the HORIZON_CONFIG dictionary.
Default: None
A list containing the slugs of any dashboards which should be active in this Horizon installation. The dashboards listed must be in a Python module which is included in the INSTALLED_APPS list and on the Python path.
Default: None
The slug of the dashboard which should act as the first-run/fallback dashboard whenever a user logs in or is otherwise redirected to an ambiguous location.
Default: settings.LOGIN_REDIRECT_URL
This can be either a literal URL path (such as the default), or Python’s dotted string notation representing a function which will evaluate what URL a user should be redirected to based on the attributes of that user.
Default: 10
The maximum number of simultaneous AJAX connections the dashboard may try to make. This is particularly relevant when monitoring a large number of instances, volumes, etc. which are all actively trying to update/change state.
Default: 2500
How frequently resources in transition states should be polled for updates, expressed in milliseconds.
Default: None
If provided, a “Help” link will be displayed in the site header which links to the value of this settings (ideally a URL containing help information).
Default: {'unauthorized': [], 'not_found': [], 'recoverable': []}
A dictionary containing classes of exceptions which Horizon’s centralized exception handling should be aware of.
Default: {‘regex’: ‘.*’, ‘help_text’: _(“Password is not accepted”)}
A dictionary containing a regular expression which will be used for password validation and help text which will be displayed if the password does not pass validation. The help text should describe the password requirements if there are any.
This setting allows you to set rules for passwords if your organization requires them.
Default: "on"
Controls whether browser autocompletion should be enabled on the login form. Valid values are "on" and "off".
Default: True
Enable or disable simplified floating IP address management.
“Simple” floating IP address management means that the user does not ever have to select the specific IP addresses they wish to use, and the process of allocating an IP and assigning it to an instance is one-click.
The “advanced” floating IP management allows users to select the floating IP pool from which the IP should be allocated and to select a specific IP address when associating one with an instance.
The following settings inform the OpenStack Dashboard of information about the other OpenStack projects which are part of this cloud and control the behavior of specific dashboards, panels, API calls, etc.
Default: "127.0.0.1"
The hostname of the Keystone server used for authentication if you only have one region. This is often the only settings that needs to be set for a basic deployment.
Default: "http://%s:5000/v2.0" % OPENSTACK_HOST
The full URL for the Keystone endpoint used for authentication. Unless you are using HTTPS, running your Keystone server on a nonstandard port, or using a nonstandard URL scheme you shouldn’t need to touch this setting.
Default: None
A tuple of tuples which define multiple regions. The tuple format is ('http://{{keystone_host}}:5000/v2.0', '{{region_name}}'). If any regions are specified the login form will have a dropdown selector for authenticating to the appropriate region, and there will be a region switcher dropdown in the site header when logged in.
If you do not have multiple regions you should use the OPENSTACK_HOST and OPENSTACK_KEYSTONE_URL settings above instead.
Default: “Member”
The name of the role which will be assigned to a user when added to a project. This name must correspond to a role name in Keystone.
Default: False
Disable SSL certificate checks in the OpenStack clients (useful for self-signed certificates).
Default: {'name': 'native', 'can_edit_user': True, 'can_edit_project': True}
A dictionary containing settings which can be used to identify the capabilities of the auth backend for Keystone.
If Keystone has been configured to use LDAP as the auth backend then set can_edit_user and can_edit_project to False and name to "ldap".
Default: {'can_set_mount_point': True, 'can_encrypt_volumes': False}
A dictionary containing settings which can be used to identify the capabilities of the hypervisor for Nova.
Some hypervisors have the ability to set the mount point for volumes attached to instances (KVM does not). Setting can_set_mount_point to False will remove the option to set the mount point from the UI.
In the Havana release, there will be a feature for encrypted volumes which will be controlled by the can_encrypt_volumes. Setting it to True in the Grizzly release will have no effect.
Default: {'enable_lb': False}
A dictionary of settings which can be used to enable optional services provided by quantum. Currently only the load balancer service is available.
Default: "internalURL"
A string which specifies the endpoint type to use for the endpoints in the Keystone service catalog. If Horizon is running external to the OpenStack environment you may wish to use "publicURL" instead.
Default: 1000
The maximum number of objects (e.g. Swift objects or Glance images) to display on a single page before providing a paging element (a “more” link) to paginate results.
Default: 20
Similar to API_RESULT_LIMIT. This setting currently only controls the Glance image list page size. It will be removed in a future version.
Warning
This is not meant to be anywhere near a complete list of settings for Django. You should always consult the upstream documentation, especially with regards to deployment considerations and security best-practices.
There are a few key settings you should be aware of for development and the most basic of deployments. Further recommendations can be found in the Deploying Horizon section of this documentation.
Default: True
Controls whether unhandled exceptions should generate a generic 500 response or present the user with a pretty-formatted debug information page.
This setting should always be set to False for production deployments as the debug page can display sensitive information to users and attackers alike.
This should absolutely be set to a unique (and secret) value for your deployment. Unless you are running a load-balancer with multiple Horizon installations behind it, each Horizon instance should have a unique secret key.
The local_settings.py.example file includes a quick-and-easy way to generate a secret key for a single installation.
These three settings should be configured if you are deploying Horizon with SSL. The values indicated in the default local_settings.py.example file are generally safe to use.