76549775fe
Use the formatting established in the style guide. There's a lot of out-of-date information in here, but that's a battle for another day. Change-Id: Ieec2c8f450c05a2451179e3bdba77514f2cc956e Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
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1.9 KiB
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59 lines
1.9 KiB
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======
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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
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hosts, meaning a ``nova-compute`` service can manage multiple ``ComputeNodes``.
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An ironic driver managed compute service uses the ironic ``node uuid`` for the
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compute node ``hypervisor_hostname`` (nodename) and ``uuid`` fields. The
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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 :ironic-doc:`flavor documentation
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</install/configure-nova-flavors.html>`).
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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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:ironic-doc:`image documentation
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</latest/install/configure-glance-images.html>`).
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Configuration
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-------------
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- :ironic-doc:`Configure the Compute service to use the Bare Metal service
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</latest/install/configure-compute.html>`.
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- :ironic-doc:`Create flavors for use with the Bare Metal service
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</latest/install/configure-nova-flavors.html>`.
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- :ironic-doc:`Conductors Groups </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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