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Chapter 2. Configuring the Compute (nova) service

Use environment files to customize the Compute (nova) service. Puppet generates and stores this configuration in the /var/lib/config-data/puppet-generated/<nova_container>/etc/nova/nova.conf file. Use the following configuration methods to customize the Compute service configuration:

  • Heat parameters - as detailed in the Compute (nova) Parameters section in the Overcloud Parameters guide. For example: 

    parameter_defaults:
  NovaSchedulerDefaultFilters: AggregateInstanceExtraSpecsFilter,RetryFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter
  NovaNfsEnabled: true
  NovaNfsShare: '192.0.2.254:/export/nova'
  NovaNfsOptions: 'context=system_u:object_r:nfs_t:s0'
  NovaNfsVersion: '4.2'
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  • Puppet parameters - as defined in /etc/puppet/modules/nova/manifests/*: 

    parameter_defaults:
    ComputeExtraConfig:
        nova::compute::force_raw_images: True
    Copy to Clipboard Toggle word wrap
    Note

    Only use this method if an equivalent heat parameter does not exist.

  • Manual hieradata overrides - for customizing parameters when no heat or Puppet parameter exists. For example, the following sets the disk_allocation_ratio in the [DEFAULT] section on the Compute role: 

    parameter_defaults:
    ComputeExtraConfig:
        nova::config::nova_config:
            DEFAULT/disk_allocation_ratio:
                value: '2.0'
    Copy to Clipboard Toggle word wrap
Warning

If a heat parameter exists, it must be used instead of the Puppet parameter; if a Puppet parameter exists, but not a heat parameter, then the Puppet parameter must be used instead of the manual override method. The manual override method must only be used if there is no equivalent heat or Puppet parameter.

Tip

Follow the guidance in Identifying Parameters to Modify to determine if a heat or Puppet parameter is available for customizing a particular configuration.

See Parameters in the Advanced Overcloud Customization guide for further details on configuring overcloud services.

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