ad3c7ad75d
Also adds a missing documentation bit and specific versions for pike notes. Change-Id: I186fe35cdd7a03702c993cae6468ef2d8151778a
120 lines
4.3 KiB
ReStructuredText
120 lines
4.3 KiB
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How it works
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============
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Integration with Ironic
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-----------------------
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Compatible Deploy Drivers
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Agent Deploy Driver
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<<<<<<<<<<<<<<<<<<<
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IPA works with the agent Deploy driver in Ironic to provision nodes. Starting
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with ironic-python-agent running on a ramdisk on an unprovisioned node,
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Ironic makes API calls to ironic-python-agent to provision the machine. This
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allows for greater control and flexibility of the entire deployment process.
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PXE Deploy Driver
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<<<<<<<<<<<<<<<<<
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IPA may also be used with the original Ironic pxe driver as of the Kilo
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OpenStack Ironic release.
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Configuring Deploy Drivers
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<<<<<<<<<<<<<<<<<<<<<<<<<<
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For information on how to install and configure Ironic drivers, including
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drivers for IPA, see the Ironic drivers documentation [0]_.
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Lookup
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~~~~~~
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On startup, the agent performs a lookup in Ironic to determine its node UUID
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by sending a hardware profile to the Ironic lookup endpoint:
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``/v1/lookup``.
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Heartbeat
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~~~~~~~~~
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After successfully looking up its node, the agent heartbeats via
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``/v1/heartbeat/{node_ident}`` every N seconds, where
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N is the Ironic conductor's agent.heartbeat_timeout value multiplied by a
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number between .3 and .6.
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For example, if your conductor's ironic.conf contains::
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[agent]
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heartbeat_timeout = 60
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IPA will heartbeat between every 20 and 36 seconds. This is to ensure jitter
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for any agents reconnecting after a network or API disruption.
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After the agent heartbeats, the conductor performs any actions needed against
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the node, including querying status of an already run command. For example,
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initiating in-band cleaning tasks or deploying an image to the node.
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Inspection
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~~~~~~~~~~
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IPA can conduct hardware inspection on start up and post data to the `Ironic
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Inspector`_. Edit your default PXE/iPXE configuration or IPA options
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baked in the image, and set ``ipa-inspection-callback-url`` to the
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full endpoint of Ironic Inspector, for example::
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ipa-inspection-callback-url=http://IP:5050/v1/continue
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Make sure your DHCP environment is set to boot IPA by default.
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.. _Ironic Inspector: https://docs.openstack.org/ironic-inspector/
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Hardware Inventory
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------------------
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IPA collects various hardware information using its
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:doc:`Hardware Managers <../contributor/hardware_managers>`,
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and sends it to Ironic on lookup and to Ironic Inspector on Inspection_.
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The exact format of the inventory depends on the hardware manager used.
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Here is the basic format expected to be provided by all hardware managers.
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The inventory is a dictionary (JSON object), containing at least the following
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fields:
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``cpu``
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CPU information: ``model_name``, ``frequency``, ``count``,
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``architecture`` and ``flags``.
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``memory``
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RAM information: ``total`` (total size in bytes), ``physical_mb``
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(physically installed memory size in MiB, optional).
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.. note::
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The difference is that the latter includes the memory region reserved
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by the kernel and is always slightly bigger. It also matches what
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the Nova flavor would contain for this node and thus is used by the
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inspection process instead of ``total``.
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``bmc_address``
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IP address of the node's BMC (aka IPMI address), optional.
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``disks``
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list of disk block devices with fields: ``name``, ``model``,
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``size`` (in bytes), ``rotational`` (boolean), ``wwn``, ``serial``,
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``vendor``, ``wwn_with_extension``, ``wwn_vendor_extension``, ``hctl``
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and ``by_path`` (the full disk path, in the form
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``/dev/disk/by-path/<rest-of-path>``).
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``interfaces``
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list of network interfaces with fields: ``name``, ``mac_address``,
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``ipv4_address``, ``lldp``, ``vendor``, ``product``, and optionally
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``biosdevname``(BIOS given NIC name). If configuration option
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``collect_lldp`` is set to True the ``lldp`` field will be populated
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by a list of type-length-value(TLV) fields retrieved using the
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Link Layer Discovery Protocol (LLDP).
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``system_vendor``
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system vendor information from SMBIOS as reported by ``dmidecode``:
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``product_name``, ``serial_number`` and ``manufacturer``.
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``boot``
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boot information with fields: ``current_boot_mode`` (boot mode used for
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the current boot - BIOS or UEFI) and ``pxe_interface`` (interface used
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for PXE booting, if any).
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References
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==========
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.. [0] Enabling Drivers - https://docs.openstack.org/ironic/latest/admin/drivers/ipa.html
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