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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'Puppet parameters - as defined in
/etc/puppet/modules/nova/manifests/*:parameter_defaults: ComputeExtraConfig: nova::compute::force_raw_images: TrueNoteOnly 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_ratioin the[DEFAULT]section on the Compute role:parameter_defaults: ComputeExtraConfig: nova::config::nova_config: DEFAULT/disk_allocation_ratio: value: '2.0'
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.
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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