1efd5ec232
Nova documentation was missing information documentation about Ironic virt driver. Change-Id: I2431dc3db94da44001eefdead50607eab662d16f Closes-Bug: #1852446
60 lines
2.1 KiB
ReStructuredText
60 lines
2.1 KiB
ReStructuredText
Ironic
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======
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Introduction
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------------
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The ironic hypervisor driver wraps the Bare Metal (ironic) API,
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enabling Nova to provision baremetal resources using the same
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user-facing API as for server management.
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This is the only driver in nova where one compute service can map to many hosts
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, meaning a ``nova-compute`` service can manage multiple ``ComputeNodes``. An
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ironic driver managed compute service uses the ironic ``node uuid`` for the
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compute node ``hypervisor_hostname`` (nodename) and ``uuid`` fields.
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The relationship of ``instance:compute node:ironic node`` is ``1:1:1``.
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Scheduling of bare metal nodes is based on custom resource classes, specified
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via the ``resource_class`` property on a node and a corresponding resource
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property on a flavor (see the `flavor documentation`_).
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The RAM and CPU settings on a flavor are ignored, and the disk is only used to
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determine the root partition size when a partition image is used (see the
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`image documentation`_).
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.. _flavor documentation: https://docs.openstack.org/ironic/latest/install/configure-nova-flavors.html
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.. _image documentation: https://docs.openstack.org/ironic/latest/install/configure-glance-images.html
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Configuration
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-------------
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- `Configure the Compute service to use the Bare Metal service
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<https://docs.openstack.org/ironic/latest/install/configure-compute.html>`_.
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- `Create flavors for use with the Bare Metal service
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<https://docs.openstack.org/ironic/latest/install/configure-nova-flavors.html>`__.
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- `Conductors Groups
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<https://docs.openstack.org/ironic/latest/admin/conductor-groups.html>`_.
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Scaling and Performance Issues
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------------------------------
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- The ``update_available_resource`` periodic task reports all the resources
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managed by Ironic. Depending the number of nodes, it can take a lot of time.
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The nova-compute will not perform any other operations when this task is
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running. You can use conductor groups to help scale, by setting
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:oslo.config:option:`ironic.partition_key`.
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Known limitations / Missing features
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------------------------------------
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* Migrate
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* Resize
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* Snapshot
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* Pause
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* Shelve
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* Evacuate
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