Chapter 3. Heat parameters

The Heat template for setting the timezone (puppet/services/time/timezone.yaml) contains a TimeZone parameter. If you leave the TimeZone parameter blank, the overcloud sets the time to UTC as a default.

To obtain lists of timezones run the timedatectl list-timezones command. The following example command retrieves the timezones for Asia:

$ sudo timedatectl list-timezones|grep "Asia"

After you identify your timezone, set the TimeZone parameter in an environment file. The following example environment file sets the value of TimeZone to Asia/Tokyo:

parameter_defaults:
  TimeZone: 'Asia/Tokyo'

For certain configurations, you might need to increase the file descriptor limit for the RabbitMQ server. Use the deployment/rabbitmq/rabbitmq-container-puppet.yaml heat template to set a new limit in the RabbitFDLimit parameter. Add the following entry to an environment file:

parameter_defaults:
  RabbitFDLimit: 65536

You might need to initially set a parameter during a deployment, then disable the parameter for a future deployment operation, such as updates or scaling operations. For example, to include a custom RPM during the overcloud creation, include the following entry in an environment file:

parameter_defaults:
  DeployArtifactURLs: ["http://www.example.com/myfile.rpm"]

To disable this parameter from a future deployment, it is not sufficient to remove the parameter. Instead, you must set the parameter to an empty value:

parameter_defaults:
  DeployArtifactURLs: []

This ensures the parameter is no longer set for subsequent deployments operations.

Use the [ROLE]Parameters parameters, replacing [ROLE] with a composable role, to set parameters for a specific role.

For example, director configures sshd on both Controller and Compute nodes. To set a different sshd parameters for Controller and Compute nodes, create an environment file that contains both the ControllerParameters and ComputeParameters parameter and set the sshd parameters for each specific role:

parameter_defaults:
  ControllerParameters:
    BannerText: "This is a Controller node"
  ComputeParameters:
    BannerText: "This is a Compute node"

Red Hat OpenStack Platform director provides many parameters for configuration. In some cases, you might experience difficulty identifying a certain option that you want to configure, and the corresponding director parameter. If there is an option that you want to configure with director, use the following workflow to identify and map the option to a specific overcloud parameter:

The following table shows the eventual mapping:

You set the KeystoneNotificationFormat in an overcloud environment file, which then sets the notification_format option in the keystone.conf file during the overcloud configuration.