5.4 KiB
Extra Specs
The following is an overview of all extra specs recognized by nova in its default configuration.
Note
Other services and virt drivers may provide additional extra specs
not listed here. In addition, it is possible to register your own extra
specs. For more information on the latter, refer to /user/filter-scheduler.
Placement
The following extra specs are used during scheduling to modify the request sent to placement.
resources
The following extra specs are used to request an amount of the specified resource from placement when scheduling. All extra specs expect an integer value.
Note
Not all of the resource types listed below are supported by all virt drivers.
resources
trait
The following extra specs are used to request a specified trait from placement when scheduling. All extra specs expect one of the following values:
requiredforbidden
Note
Not all of the traits listed below are supported by all virt drivers.
trait
Scheduler Filters
The following extra specs are specific to various in-tree scheduler filters.
aggregate_instance_extra_specs
The following extra specs are used to specify metadata that must be present on the aggregate of a host. If this metadata is not present or does not match the expected value, the aggregate and all hosts within in will be rejected.
Requires the AggregateInstanceExtraSpecsFilter scheduler
filter.
aggregate_instance_extra_specs
capabilities
The following extra specs are used to specify a host capability that must be provided by the host compute service. If this capability is not present or does not match the expected value, the host will be rejected.
Requires the ComputeCapabilitiesFilter scheduler
filter.
All extra specs expect similar types of values:
=(equal to or greater than as a number; same as vcpus case)==(equal to as a number)!=(not equal to as a number)>=(greater than or equal to as a number)<=(less than or equal to as a number)s==(equal to as a string)s!=(not equal to as a string)s>=(greater than or equal to as a string)s>(greater than as a string)s<=(less than or equal to as a string)s<(less than as a string)<in>(substring)<all-in>(all elements contained in collection)<or>(find one of these)- A specific value, e.g.
true,123,testing
Examples are: >= 5, s== 2.1.0,
<in> gcc, <all-in> aes mmx, and
<or> fpu <or> gpu
Note
Not all operators will apply to all types of values. For example, the
== operator should not be used for a string value - use
s== instead.
capabilities
Virt driver
The following extra specs are used as hints to configure internals of a instance, from the bus used for paravirtualized devices to the amount of a physical device to passthrough to the instance. Most of these are virt driver-specific.
quota
The following extra specs are used to configure quotas for various paravirtualized devices. Different quotas are supported by different virt drivers, as noted below.
quota
accel
The following extra specs are used to configure attachment of various
accelerators to an instance. For more information, refer to the
Cyborg documentation <>.
They are only supported by the libvirt virt driver.
accel
pci_passthrough
The following extra specs are used to configure passthrough of a host
PCI device to an instance. This requires prior host configuration. For
more information, refer to /admin/pci-passthrough.
They are only supported by the libvirt virt driver.
pci_passthrough
hw
The following extra specs are used to configure various attributes of instances. Some of the extra specs act as feature flags, while others tweak for example the guest-visible CPU topology of the instance.
Except where otherwise stated, they are only supported by the libvirt virt driver.
hw
hw_rng
The following extra specs are used to configure a random number generator for an instance.
They are only supported by the libvirt virt driver.
hw_rng
hw_video
The following extra specs are used to configure attributes of the default guest video device.
They are only supported by the libvirt virt driver.
hw_video
os
The following extra specs are used to configure various attributes of instances when using the HyperV virt driver.
They are only supported by the HyperV virt driver.
os
powervm
The following extra specs are used to configure various attributes of instances when using the PowerVM virt driver.
They are only supported by the PowerVM virt driver.
powervm
vmware
The following extra specs are used to configure various attributes of instances when using the VMWare virt driver.
They are only supported by the VMWare virt driver.
vmware
Others (uncategorized)
The following extra specs are not part of a group.