ironic/doc/source/install/configure-nova-flavors.rst

Create flavors for use with the Bare Metal service

Scheduling based on properties

You'll need to create a special bare metal flavor in the Compute service. The flavor is mapped to the bare metal node through the hardware specifications.

1. Change these to match your hardware:

   $ RAM_MB=1024
   $ CPU=2
   $ DISK_GB=100
   $ ARCH={i686|x86_64}

2. Create the bare metal flavor by executing the following command:

   $ nova flavor-create my-baremetal-flavor auto $RAM_MB $DISK_GB $CPU

   Note

   You can replace auto with your own flavor id.

3. Set the architecture as extra_specs information of the flavor. This will be used to match against the properties of bare metal nodes:

   $ nova flavor-key my-baremetal-flavor set cpu_arch=$ARCH

Scheduling based on resource classes

The Newton release of the Bare Metal service includes a field on the node resource called resource_class. This field is available in version 1.21 of the Bare Metal service API.

In the future (Pike or Queens release), a Compute service flavor will use this field for scheduling, instead of the CPU, RAM, and disk properties defined in the flavor above. A flavor will require exactly one of some bare metal resource class.

This work is still in progress (see blueprint custom-resource-classes-in-flavors), and the syntax for the flavor-create call to associate flavors with resource classes is yet to be implemented. According to the custom resource classes specification, it will look as follows:

$ nova flavor-key my-baremetal-flavor set resources:CUSTOM_<RESOURCE_CLASS>=1

where <RESOURCE_CLASS> is the resource class name in upper case with all punctuation replaces with an underscore.

For example,

$ ironic --ironic-api-version=1.21 node-update $NODE_UUID \
  replace resource_class=baremetal.with-GPU
$ nova flavor-key my-baremetal-flavor set resources:CUSTOM_BAREMETAL_WITH_CPU=1

Another set of extra_specs properties will be used to disable scheduling based on standard properties for a bare metal flavor:

$ nova flavor-key my-baremetal-flavor set resources:VCPU=0
$ nova flavor-key my-baremetal-flavor set resources:MEMORY_MB=0
$ nova flavor-key my-baremetal-flavor set resources:DISK_GB=0

Note

The last step will be required, as the Compute service will stop providing standard resources for bare metal nodes.