Chapter 3. 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'

The Heat template for the OpenStack Networking (neutron) API (puppet/services/neutron-api.yaml) contains a parameter to enable and disable Distributed Virtual Routing (DVR). The default for the parameter is false. However, you can enable it using the following in an environment file:

parameter_defaults:
  NeutronEnableDVR: true

For certain configurations, you might need to increase the file descriptor limit for the RabbitMQ server. The puppet/services/rabbitmq.yaml Heat template allows you to set the RabbitFDLimit parameter to the limit you require. Add the following to an environment file.

parameter_defaults:
  RabbitFDLimit: 65536

In some case, you might need to initially set a parameters 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, you would include the following:

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

If you need to disable this parameter from a future deployment, it is not enough to remove the parameter. Instead, you 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 logrotate on both Controller and Compute nodes. To set a different different logrotate parameters for Controller and Compute nodes, create an environment file that contains both the ‘ControllerParameters’ and ‘ComputeParameters’ parameter and set the logrotate parameter for each specific role:

parameter_defaults:
  ControllerParameters:
    LogrotateMaxsize: 10M
    LogrotatePurgeAfterDays: 30
  ComputeParameters:
    LogrotateMaxsize: 20M
    LogrotatePurgeAfterDays: 15

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

The following table shows the eventual mapping:

This means setting the KeystoneNotificationFormat in an overcloud’s environment file would set the notification_format option in the keystone.conf file during the overcloud’s configuration.