81 lines
3.5 KiB
ReStructuredText
81 lines
3.5 KiB
ReStructuredText
===========================
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Bare Metal service overview
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===========================
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The Bare Metal service is a collection of components that provides support to
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manage and provision physical machines.
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Also known as the ``ironic`` project, the Bare Metal service may, depending
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upon configuration, interact with several other OpenStack services. This
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includes:
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- the OpenStack Telemetry module (``ceilometer``) for consuming the IPMI
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metrics
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- the OpenStack Identity service (``keystone``) for request authentication and
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to locate other OpenStack services
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- the OpenStack Image service (``glance``) from which to retrieve images and
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image meta-data
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- the OpenStack Networking service (``neutron``) for DHCP and network
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configuration
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- the OpenStack Compute service (``nova``) works with the Bare Metal service
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and acts as a user-facing API for instance management, while the Bare Metal
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service provides the admin/operator API for hardware management. The
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OpenStack Compute service also provides scheduling facilities (matching
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flavors <-> images <-> hardware), tenant quotas, IP assignment, and other
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services which the Bare Metal service does not, in and of itself, provide.
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- the OpenStack Object Storage (``swift``) provides temporary storage
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for the configdrive, user images, deployment logs and inspection data.
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The Bare Metal service includes the following components:
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ironic-api
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A RESTful API that processes application requests by sending them to the
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ironic-conductor over `remote procedure call (RPC)`_.
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ironic-conductor
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Adds/edits/deletes nodes; powers on/off nodes with ipmi or ssh;
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provisions/deploys/cleans bare metal nodes.
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ironic-python-agent
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A python service which is run in a temporary ramdisk to provide
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ironic-conductor and ironic-inspector services with remote access, in-band
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hardware control, and hardware introspection.
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.. _`remote procedure call (RPC)`: https://en.wikipedia.org/wiki/Remote_procedure_call
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Additionally, the Bare Metal service has certain external dependencies, which
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are very similar to other OpenStack services:
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- A database to store hardware information and state. You can set the database
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back-end type and location. A simple approach is to use the same database
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back end as the Compute service. Another approach is to use a separate
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database back-end to further isolate bare metal resources (and associated
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metadata) from users.
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- An oslo.messaging compatible queue, such as RabbitMQ. It may use the same
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implementation as that of the Compute service, but that is not a requirement.
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Optionally, one may wish to utilize the following associated projects for
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additional functionality:
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python-ironicclient_
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A command-line interface (CLI) and python bindings for interacting with the
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Bare Metal service.
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ironic-inspector_
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An associated service which performs in-band hardware introspection by
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PXE booting unregistered hardware into the ironic-python-agent ramdisk.
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diskimage-builder_
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A related project to help facilitate the creation of ramdisks and machine
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images, such as those running the ironic-python-agent.
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bifrost_
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A set of Ansible playbooks that automates the task of deploying a base image
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onto a set of known hardware using ironic in a standalone mode.
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.. _python-ironicclient: http://docs.openstack.org/developer/python-ironicclient/
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.. _ironic-inspector: http://docs.openstack.org/developer/ironic-inspector/
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.. _diskimage-builder: http://docs.openstack.org/developer/diskimage-builder/
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.. _bifrost: http://docs.openstack.org/developer/bifrost/
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