Sahara Configuration Guide ========================== This guide covers the steps for a basic configuration of sahara. It will help you to configure the service in the most simple manner. Basic configuration ------------------- Sahara is packaged with a basic sample configuration file: ``sahara.conf.sample-basic``. This file contains all the essential parameters that are required for sahara. We recommend creating your configuration file based on this basic example. If a more thorough configuration is needed we recommend using the ``tox`` tool to create a full configuration file by executing the following command: .. sourcecode:: cfg $ tox -e genconfig Running this command will create a file named ``sahara.conf.sample`` in the ``etc/sahara`` directory of the project. After creating a configuration file by either copying the basic example or generating one, edit the ``connection`` parameter in the ``[database]`` section. The URL provided here should point to an empty database. For example, the connection string for a MySQL database will be: .. sourcecode:: cfg connection=mysql://username:password@host:port/database Next you will configure the Identity service parameters in the ``[keystone_authtoken]`` section. The ``auth_uri`` parameter should point to the public Identity API endpoint. The ``identity_uri`` should point to the admin Identity API endpoint. For example: .. sourcecode:: cfg auth_uri=http://127.0.0.1:5000/v2.0/ identity_uri=http://127.0.0.1:35357/ Specify the ``admin_user``, ``admin_password`` and ``admin_tenant_name``. These parameters must specify an Identity user who has the ``admin`` role in the given project. These credentials allow sahara to authenticate and authorize its users. Next you will configure the default Networking service. If using neutron for networking the following parameter should be set in the ``[DEFAULT]`` section: .. sourcecode:: cfg use_neutron=true If you are using nova-network for networking then this parameter should be set to ``false``. With these parameters set, sahara is ready to run. By default the sahara's log level is set to INFO. If you wish to increase the logging levels for troubleshooting, set ``debug`` to ``true`` in the ``[DEFAULT]`` section of the configuration file. .. _neutron-nova-network: Networking configuration ------------------------ By default sahara is configured to use the neutron. Additionally, if the cluster supports network namespaces the ``use_namespaces`` property can be used to enable their usage. .. sourcecode:: cfg [DEFAULT] use_neutron=True use_namespaces=True .. note:: If a user other than ``root`` will be running the Sahara server instance and namespaces are used, some additional configuration is required, please see :ref:`non-root-users` for more information. If an OpenStack cluster uses the deprecated nova-network, then the ``use_neutron`` parameter should be set to ``False`` in the sahara configuration file. .. _floating_ip_management: Floating IP management ++++++++++++++++++++++ During cluster setup sahara must access instances through a secure shell (SSH). To establish this connection it may use either the fixed or floating IP address of an instance. By default sahara is configured to use floating IP addresses for access. This is controlled by the ``use_floating_ips`` configuration parameter. With this setup the user has two options for ensuring that the instances in the node groups templates that requires floating IPs gain a floating IP address: * If using the nova-network, it may be configured to assign floating IP addresses automatically by setting the ``auto_assign_floating_ip`` parameter to ``True`` in the nova configuration file (usually ``nova.conf``). * The user may specify a floating IP address pool for each node group that requires floating IPs directly. From Newton changes were made to allow the coexistence of clusters using floating IPs and clusters using fixed IPs. If ``use_floating_ips`` is True it means that the floating IPs can be used by Sahara to spawn clusters. But, differently from previous versions, this does not mean that all instances in the cluster must have floating IPs and that all clusters must use floating IPs. It is possible in a single Sahara deploy to have clusters setup using fixed IPs, clusters using floating IPs and cluster that use both. If not using floating IP addresses (``use_floating_ips=False``) sahara will use fixed IP addresses for instance management. When using neutron for the Networking service the user will be able to choose the fixed IP network for all instances in a cluster. Whether using nova-network or neutron it is important to ensure that all instances running sahara have access to the fixed IP networks. .. _notification-configuration: Notifications configuration --------------------------- Sahara can be configured to send notifications to the OpenStack Telemetry module. To enable this functionality the following parameter ``enable`` should be set in the ``[oslo_messaging_notifications]`` section of the configuration file: .. sourcecode:: cfg [oslo_messaging_notifications] enable = true And the following parameter ``driver`` should be set in the ``[oslo_messaging_notifications]`` section of the configuration file: .. sourcecode:: cfg [oslo_messaging_notifications] driver = messaging By default sahara is configured to use RabbitMQ as its message broker. If you are using RabbitMQ as the message broker, then you should set the following parameter in the ``[DEFAULT]`` section: .. sourcecode:: cfg rpc_backend = rabbit You may also need to specify the connection parameters for your RabbitMQ installation. The following example shows the default values in the ``[oslo_messaging_rabbit]`` section which may need adjustment: .. sourcecode:: cfg rabbit_host=localhost rabbit_port=5672 rabbit_hosts=$rabbit_host:$rabbit_port rabbit_userid=guest rabbit_password=guest rabbit_virtual_host=/ .. .. _orchestration-configuration: Orchestration configuration --------------------------- By default sahara is configured to use the heat engine for instance creation. The heat engine uses the OpenStack Orchestration service to provision instances. This engine makes calls directly to the services required for instance provisioning. .. _policy-configuration-label: Policy configuration -------------------- Sahara’s public API calls may be restricted to certain sets of users by using a policy configuration file. The location of the policy file(s) is controlled by the ``policy_file`` and ``policy_dirs`` parameters in the ``[oslo_policy]`` section. By default sahara will search for a ``policy.json`` file in the same directory as the ``sahara.conf`` configuration file. Examples ++++++++ Example 1. Allow all method to all users (default policy). .. sourcecode:: json { "default": "" } Example 2. Disallow image registry manipulations to non-admin users. .. sourcecode:: json { "default": "", "data-processing:images:register": "role:admin", "data-processing:images:unregister": "role:admin", "data-processing:images:add_tags": "role:admin", "data-processing:images:remove_tags": "role:admin" } API configuration ----------------- Sahara uses the ``api-paste.ini`` file to configure the data processing API service. For middleware injection sahara uses pastedeploy library. The location of the api-paste file is controlled by the ``api_paste_config`` parameter in the ``[default]`` section. By default sahara will search for a ``api-paste.ini`` file in the same directory as the configuration file.