Sahara Upgrade Guide

This page contains details about upgrading sahara between releases such as configuration file updates, database migrations, and architectural changes.

Icehouse -> Juno

Main binary renamed to sahara-all

The All-In-One sahara binary has been renamed from sahara-api to sahara-all. The new name should be used in all cases where the All-In-One sahara is desired.

Authentication middleware changes

The custom auth_token middleware has been deprecated in favor of the keystone middleware. This change requires an update to the sahara configuration file. To update your configuration file you should replace the following parameters from the [DEFAULT] section with the new parameters in the [keystone_authtoken] section:

Old parameter name	New parameter name
os_admin_username	admin_user
os_admin_password	admin_password
os_admin_tenant_name	admin_tenant_name

Additionally, the parameters os_auth_protocol, os_auth_host, and os_auth_port have been combined to create the auth_uri and identity_uri parameters. These new parameters should be full URIs to the keystone public and admin endpoints, respectively.

For more information about these configuration parameters please see the Sahara Configuration Guide.

Database package changes

The oslo based code from sahara.openstack.common.db has been replaced by the usage of the oslo.db package. This change does not require any update to sahara’s configuration file.

Additionally, the usage of SQLite databases has been deprecated. Please use MySQL or PostgreSQL databases for sahara. SQLite has been deprecated because it does not, and is not going to, support the ALTER COLUMN and DROP COLUMN commands required for migrations between versions. For more information please see http://www.sqlite.org/omitted.html

Sahara integration into OpenStack Dashboard

The sahara dashboard package has been deprecated in the Juno release. The functionality of the dashboard has been fully incorporated into the OpenStack Dashboard. The sahara interface is available under the “Project” -> “Data Processing” tab.

The Data processing service endpoints must be registered in the Identity service catalog for the Dashboard to properly recognize and display those user interface components. For more details on this process please see registering Sahara in installation guide.

The sahara-dashboard project is now used solely to host sahara user interface integration tests.

Virtual machine user name changes

The HEAT infrastructure engine has been updated to use the same rules for instance user names as the direct engine. In previous releases the user name for instances created by sahara using HEAT was always ‘ec2-user’. As of Juno, the user name is taken from the image registry as described in the Registering an Image document.

This change breaks backward compatibility for clusters created using the HEAT infrastructure engine prior to the Juno release. Clusters will continue to operate, but we do not recommended using the scaling operations with them.

Anti affinity implementation changed

Starting with the Juno release the anti affinity feature is implemented using server groups. From the user perspective there will be no noticeable changes with this feature. Internally this change has introduced the following behavior:

1. Server group objects will be created for any clusters with anti affinity enabled.
2. Affected instances on the same host will not be allowed even if they do not have common processes. Prior to Juno, instances with differing processes were allowed on the same host. The new implementation guarantees that all affected instances will be on different hosts regardless of their processes.

The new anti affinity implementation will only be applied for new clusters. Clusters created with previous versions will continue to operate under the older implementation, this applies to scaling operations on these clusters as well.

Juno -> Kilo

Sahara requires policy configuration

Sahara now requires a policy configuration file. The policy.json file should be placed in the same directory as the sahara configuration file or specified using the policy_file parameter. For more details about the policy file please see the policy section in the configuration guide.

Kilo -> Liberty

Direct engine deprecation

In the Liberty release the direct infrastructure engine has been deprecated and the heat infrastructure engine is now default. This means, that it is preferable to use heat engine instead now. In the Liberty release you can continue to operate clusters with the direct engine (create, delete, scale). Using heat engine only the delete operation is available on clusters that were created by the direct engine. After the Liberty release the direct engine will be removed, this means that you will only be able to delete clusters created with the direct engine.

Policy namespace changed (policy.json)

The “data-processing:” namespace has been added to the beginning of the all Sahara’s policy based actions, so, you need to update the policy.json file by prepending all actions with “data-processing:”.