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Chapter 2. Installation

This section assumes that you are deploying OpenStack Data Processing on the overcloud, through the director. It also assumes that you created a director installation user named stack, identical to Creating a Director Installation User (from Director Installation and Usage).

The director uses environment files to configure the overcloud during deployment. These environment files are stored in /usr/share/openstack-tripleo-heat-templates/, along with the Puppet scripts and heat templates used to orchestrate each service.

The OpenStack Data Processing service is disabled on the overcloud by default. This is because the OpenStack Data Processing components are registered as null operations (OS::Heat::None) in the main overcloud environment file (/usr/share/openstack-tripleo-heat-templates/overcloud-resource-registry-puppet.yaml): 

  OS::TripleO::Services::SaharaApi: OS::Heat::None
  OS::TripleO::Services::SaharaEngine: OS::Heat::None
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To enable these services, include an environment file that links these resources to their respective Heat templates in the /usr/share/openstack-tripleo-heat-templates/deployment/sahara directory. Some services have predefined environment files in the environments directory. For example, the Data Processing service (sahara) use the /usr/share/openstack-tripleo-heat-templates/environments/services/sahara.yaml file, which contains the following: 

resource_registry:
  OS::TripleO::Services::SaharaApi: ../../deployment/sahara/sahara-api-container-puppet.yaml
  OS::TripleO::Services::SaharaEngine: ../../deployment/sahara/sahara-engine-container-puppet.yaml
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This overrides the default null operation resources and enables the services. Include this environment file when running the openstack overcloud deploy command. 

$ openstack overcloud deploy --templates -e \
  /usr/share/openstack-tripleo-heat-templates/environments/services/sahara.yaml
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Note

You can also enable instance locality to force clusters to use volumes local to the same node. Doing so could improve the performance of your cluster. See Appendix A, Enabling Instance Locality for related infrormation.

Important

If you passed any extra environment files when you created the overcloud, pass them again here using the -e option to avoid making undesired changes to the overcloud. For more information, see Modifying the overcloud environment in the Director Installation and Usage guide.

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