The ironic hypervisor driver wraps the Bare Metal (ironic) API, enabling Nova to provision baremetal resources using the same user-facing API as for server management.
This is the only driver in nova where one compute service can map to many hosts
, meaning a nova-compute
service can manage multiple ComputeNodes
. An
ironic driver managed compute service uses the ironic node uuid
for the
compute node hypervisor_hostname
(nodename) and uuid
fields.
The relationship of instance:compute node:ironic node
is 1:1:1
.
Scheduling of bare metal nodes is based on custom resource classes, specified
via the resource_class
property on a node and a corresponding resource
property on a flavor (see the flavor documentation).
The RAM and CPU settings on a flavor are ignored, and the disk is only used to
determine the root partition size when a partition image is used (see the
image documentation).
update_available_resource
periodic task reports all the resources
managed by Ironic. Depending the number of nodes, it can take a lot of time.
The nova-compute will not perform any other operations when this task is
running. You can use conductor groups to help scale, by setting
ironic.partition_key
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