How it works ============ Integration with Ironic ----------------------- For information on how to install and configure Ironic drivers, including drivers for IPA, see the :ironic-doc:`Ironic drivers documentation `. Lookup ~~~~~~ On startup, the agent performs a lookup in Ironic to determine its node UUID by sending a hardware profile to the Ironic lookup endpoint: `/v1/lookup `_. Heartbeat ~~~~~~~~~ After successfully looking up its node, the agent heartbeats via `/v1/heartbeat/{node_ident} `_ every N seconds, where N is the Ironic conductor's ``agent.heartbeat_timeout`` value multiplied by a number between .3 and .6. For example, if your conductor's ironic.conf contains:: [agent] heartbeat_timeout = 60 IPA will heartbeat between every 20 and 36 seconds. This is to ensure jitter for any agents reconnecting after a network or API disruption. After the agent heartbeats, the conductor performs any actions needed against the node, including querying status of an already run command. For example, initiating in-band cleaning tasks or deploying an image to the node. Inspection ---------- IPA can conduct hardware inspection on start up and post data to the :ironic-inspector-doc:`Ironic Inspector <>` via the `/v1/continue `_ endpoint. Edit your default PXE/iPXE configuration or IPA options baked in the image, and set ``ipa-inspection-callback-url`` to the full endpoint of Ironic Inspector, for example:: ipa-inspection-callback-url=http://IP:5050/v1/continue Make sure your DHCP environment is set to boot IPA by default. If you use the new built-in :ironic-doc:`Ironic in-band inspection `, it is enough to only set a list of collectors (see `inspection data`_), for example:: ipa-inspection-collectors=default,logs Then the correct callback URL will be determined from the Ironic URL in ``ipa-api-url``. Instance agent ~~~~~~~~~~~~~~ For the cases where the infrastructure operator and cloud user are the same, an additional tool exists that can be installed alongside the agent inside a running instance. This is the ``ironic-collect-introspection-data`` command which allows for a node in ``ACTIVE`` state to publish updated introspection data to ironic-inspector. This ability requires ironic-inspector to be configured with ``[processing]permit_active_introspection`` set to ``True``. For example:: ironic-collect-introspection-data --inspection_callback_url http://IP:5050/v1/continue Alternatively, this command may also be used with multicast DNS functionality to identify the Ironic Inspector service endpoint. For example:: ironic-collect-introspection-data --inspection_callback_url mdns An additional daemon mode may be useful for some operators who wish to receive regular updates, in the form of the ``[DEFAULT]introspection_daemon`` boolean configuration option. For example:: ironic-collect-introspection-data --inspection_callback_url mdns --introspection_daemon The above command will attempt to connect to introspection and will then enter a loop to publish every 300 seconds. This can be tuned with the ``[DEFAULT]introspection_daemon_post_interval`` configuration option. Inspection Data ~~~~~~~~~~~~~~~ As part of the inspection process, data is collected on the machine and sent back to :ironic-inspector-doc:`Ironic Inspector <>` for storage. It can be accessed via the `introspection data API `_. The exact format of the data depends on the enabled *collectors*, which can be configured using the ``ipa-inspection-collectors`` kernel parameter. Each collector appends information to the resulting JSON object. The in-tree collectors are: ``default`` The default enabled collectors. Collects the following keys: * ``inventory`` - `Hardware Inventory`_. * ``root_disk`` - The default root device for this machine, which will be used for deployment if root device hints are not provided. * ``configuration`` - Inspection configuration, an object with two keys: * ``collectors`` - List of enabled collectors. * ``managers`` - List of enabled :ref:`Hardware Managers`: items with keys ``name`` and ``version``. * ``boot_interface`` - Deprecated, use the ``inventory.boot.pxe_interface`` field. ``logs`` Collect system logs. To yield useful results it must always go last in the list of collectors. Provides one key: * ``logs`` - base64 encoded tarball with various logs. ``pci-devices`` Collects the list of PCI devices. Provides one key: * ``pci_devices`` - list of objects with keys ``vendor_id`` and ``product_id``. ``extra-hardware`` Collects a vast list of facts about the systems, using the hardware_ library, which is a required dependency for this collector. Adds one key: * ``data`` - raw data from the ``hardware-collect`` utility. Is a list of lists with 4 items each. It is recommended to use this collector together with the ``extra_hardware`` processing hook on the Ironic Inspector side to convert it to a nested dictionary in the ``extra`` key. If ``ipa-inspection-benchmarks`` is set, the corresponding benchmarks are executed and their result is also provided. ``dmi-decode`` Collects information from ``dmidecode``. Provides one key: * ``dmi`` DMI information in three keys: ``bios``, ``cpu`` and ``memory``. .. TODO(dtantsur): figure out details ``numa-topology`` Collects NUMA_ topology information. Provides one key: * ``numa_topology`` with three nested keys: * ``ram`` - list of objects with keys ``numa_node`` (node ID) and ``size_kb``. * ``cpus`` - list of objects with keys ``cpu`` (CPU ID), ``numa_node`` (node ID) and ``thread_siblings`` (list of sibling threads). * ``nics`` - list of objects with keys ``name`` (NIC name) and ``numa_node`` (node ID). ``lldp`` Collects information about the network connectivity using LLDP_. Provides one key: * ``lldp_raw`` - mapping of interface names to lists of raw type-length-value (TLV) records. ``usb-devices`` Collects USB devices information. Adds one key: * ``usb_devices`` - list of objects with keys ``product``, ``vendor`` and ``handle`` .. _hardware: https://pypi.org/project/hardware/ .. _NUMA: https://en.wikipedia.org/wiki/Non-uniform_memory_access .. _LLDP: https://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol .. _hardware-inventory: Hardware Inventory ------------------ IPA collects various hardware information using its :doc:`Hardware Managers <../contributor/hardware_managers>`, and sends it to Ironic on lookup and to Ironic Inspector on Inspection_. The exact format of the inventory depends on the hardware manager used. Here is the basic format expected to be provided by all hardware managers. The inventory is a dictionary (JSON object), containing at least the following fields: ``cpu`` CPU information: ``model_name``, ``frequency``, ``count``, ``architecture``, ``flags`` and ``socket_count``. ``memory`` RAM information: ``total`` (total size in bytes), ``physical_mb`` (physically installed memory size in MiB, optional). .. note:: The difference is that the latter includes the memory region reserved by the kernel and is always slightly bigger. It also matches what the Nova flavor would contain for this node and thus is used by the inspection process instead of ``total``. ``bmc_address`` IPv4 address of the node's BMC (aka IPMI v4 address), optional. ``bmc_v6address`` IPv6 address of the node's BMC (aka IPMI v6 address), optional. ``disks`` list of disk block devices with fields: ``name``, ``model``, ``size`` (in bytes), ``rotational`` (boolean), ``wwn``, ``serial``, ``uuid``, ``vendor``, ``wwn_with_extension``, ``wwn_vendor_extension``, ``hctl`` and ``by_path`` (the full disk path, in the form ``/dev/disk/by-path/``). ``interfaces`` list of network interfaces with fields: ``name``, ``mac_address``, ``ipv4_address``, ``lldp``, ``vendor``, ``product``, and optionally ``biosdevname`` (BIOS given NIC name) and ``speed_mbps`` (maximum supported speed). .. note:: For backward compatibility, interfaces may contain ``lldp`` fields. They are deprecated, consumers should rely on the ``lldp`` inspection collector instead. ``system_vendor`` system vendor information from SMBIOS as reported by ``dmidecode``: ``product_name``, ``serial_number`` and ``manufacturer``, as well as a ``firmware`` structure with fields ``vendor``, ``version`` and ``build_date``. ``boot`` boot information with fields: ``current_boot_mode`` (boot mode used for the current boot - BIOS or UEFI) and ``pxe_interface`` (interface used for PXE booting, if any). ``hostname`` hostname for the system .. note:: This is most likely to be set by the DHCP server. Could be localhost if the DHCP server does not set it. Image Checksums --------------- As part of the process of downloading images to be written to disk as part of image deployment, a series of fields are utilized to determine if the image which has been downloaded matches what the user stated as the expected image checksum utilizing the ``instance_info/image_checksum`` value. OpenStack, as a whole, has replaced the "legacy" ``checksum`` field with ``os_hash_value`` and ``os_hash_algo`` fields, which allows for an image checksum and value to be asserted. An advantage of this is a variety of algorithms are available, if a user/operator is so-inclined. For the purposes of Ironic, we continue to support the pass-through checksum field as we support the checksum being retrieved via a URL. We also support determining the checksum by length. The field can be utilized to designate: * A URL to retrieve a checksum from. * MD5 (Disabled by default, see ``[DEFAULT]md5_enabled`` in the agent configuration file.) * SHA-2 based SHA256 * SHA-2 based SHA512 SHA-3 based checksums are not supported for auto-determination as they can have a variable length checksum result. At of when this documentation was added, SHA-2 based checksum algorithms have not been withdrawn from from approval. If you need to force use of SHA-3 based checksums, you *must* utilize the ``os_hash_algo`` setting along with the ``os_hash_value`` setting.