This guide covers the steps for a basic configuration of sahara. It will help you to configure the service in the most simple manner.
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:
$ 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:
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:
auth_uri=http://127.0.0.1:5000/v2.0/
identity_uri=http://127.0.0.1:35357/
Specify the username
, password
and project_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:
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.
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.
[DEFAULT]
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 Non-root users for more information.
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:
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.
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:
[oslo_messaging_notifications]
enable = true
And the following parameter driver
should be set in the
[oslo_messaging_notifications]
section of the configuration file:
[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:
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:
rabbit_host=localhost
rabbit_port=5672
rabbit_hosts=$rabbit_host:$rabbit_port
rabbit_userid=guest
rabbit_password=guest
rabbit_virtual_host=/
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.
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.
Example 1. Allow all method to all users (default policy).
{
"default": ""
}
Example 2. Disallow image registry manipulations to non-admin users.
{
"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"
}
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.
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