Refer to the API reference for information on the HTTP API. Refer to the client documentation for information on how to use CLI and Python library.

Using from Ironic API

Ironic Kilo introduced support for hardware introspection under name of “inspection”. ironic-inspector introspection is supported for some generic drivers, please refer to Ironic inspection documentation for details.

Node States

  • The nodes should be moved to MANAGEABLE provision state before introspection (requires python-ironicclient of version 0.5.0 or newer):

    baremetal node manage <node>
  • The introspection can be triggered by using the following command:

    baremetal node inspect <node>
  • After successful introspection and before deploying nodes should be made available to Nova, by moving them to AVAILABLE state:

    baremetal node provide <node>


    Due to how Nova interacts with Ironic driver, you should wait 1 minute before Nova becomes aware of available nodes after issuing this command. Use nova hypervisor-stats command output to check it.

Introspection Rules

Inspector supports a simple JSON-based DSL to define rules to run during introspection. Inspector provides an API to manage such rules, and will run them automatically after running all processing hooks.

A rule consists of conditions to check, and actions to run. If conditions evaluate to true on the introspection data, then actions are run on a node.

Please refer to the command below to import introspection rule:

baremetal introspection rule import <json file>

Available conditions and actions are defined by plugins, and can be extended, see How To Contribute for details. See the API reference for specific calls to define introspection rules.


A condition is represented by an object with fields:

op the type of comparison operation, default available operators include:

  • eq, le, ge, ne, lt, gt - basic comparison operators;

  • in-net - checks that an IP address is in a given network;

  • matches - requires a full match against a given regular expression;

  • contains - requires a value to contain a given regular expression;

  • is-empty - checks that field is an empty string, list, dict or None value.

field a JSON path to the field in the introspection data to use in comparison.

Starting with the Mitaka release, you can also apply conditions to ironic node field. Prefix field with schema (data:// or node://) to distinguish between values from introspection data and node. Both schemes use JSON path:

{"field": "node://property.path", "op": "eq", "value": "val"}
{"field": "data://introspection.path", "op": "eq", "value": "val"}

if scheme (node or data) is missing, condition compares data with introspection data.

invert boolean value, whether to invert the result of the comparison.

multiple how to treat situations where the field query returns multiple results (e.g. the field contains a list), available options are:

  • any (the default) require any to match,

  • all require all to match,

  • first requrie the first to match.

All other fields are passed to the condition plugin, e.g. numeric comparison operations require a value field to compare against.


By default, introspection rules are applied to all nodes being inspected. In order for the rule to be applied only to specific nodes, a matching scope variable must be set to both the rule and the node. To set the scope for a rule include field "scope" in JSON file before importing. For example:

cat <json file>
    "description": "...",
    "actions": [...],
    "conditions": [...],
    "scope": "SCOPE"

Set the property inspection_scope on the node you want the rule to be applied to:

baremetal node set --property inspection_scope="SCOPE" <node>

Now, when inspecting, the rule will be applied only to nodes with matching scope value. It will also ignore nodes that do not have inspection_scope property set. Note that if a rule has no scope set, it will be applied to all nodes, regardless if they have inspection_scope set or not.


An action is represented by an object with fields:

action type of action. Possible values are defined by plugins.

All other fields are passed to the action plugin.

Default available actions include:

  • fail fail introspection. Requires a message parameter for the failure message.

  • set-attribute sets an attribute on an Ironic node. Requires a path field, which is the path to the attribute as used by ironic (e.g. /properties/something), and a value to set.

  • set-capability sets a capability on an Ironic node. Requires name and value fields, which are the name and the value for a new capability accordingly. Existing value for this same capability is replaced.

  • extend-attribute the same as set-attribute, but treats existing value as a list and appends value to it. If optional unique parameter is set to True, nothing will be added if given value is already in a list.

  • add-trait adds a trait to an Ironic node. Requires a name field with the name of the trait to add.

  • remove-trait removes a trait from an Ironic node. Requires a name field with the name of the trait to remove.

Starting from Mitaka release, value field in actions supports fetching data from introspection, using python string formatting notation:

{"action": "set-attribute", "path": "/driver_info/ipmi_address",
 "value": "{data[inventory][bmc_address]}"}

Note that any value referenced in this way will be converted to a string.

If value is a dict or list, strings nested at any level within the structure will be formatted as well:

{"action": "set-attribute", "path": "/properties/root_device",
 "value": {"serial": "{data[root_device][serial]}"}}


ironic-inspector heavily relies on plugins for data processing. Even the standard functionality is largely based on plugins. Set processing_hooks option in the configuration file to change the set of plugins to be run on introspection data. Note that order does matter in this option, especially for hooks that have dependencies on other hooks.

These are plugins that are enabled by default and should not be disabled, unless you understand what you’re doing:


validates and updates basic hardware scheduling properties: CPU number and architecture, memory and disk size.


Diskless nodes have the disk size property local_gb == 0. Always use node driver root_device hints to prevent unexpected HW failures passing silently.


validates network interfaces information. Creates new ports, optionally deletes ports that were not present in the introspection data. Also sets the pxe_enabled flag for the PXE-booting port and unsets it for all the other ports to avoid nova picking a random port to boot the node.


When the pxe_filter is configured to only open the DHCP server for known MAC addresses, i.e the [pxe_filter]deny_unknown_macs configuration option is enabled, it is not possible to rely on the validate_interfaces processing plug-in to create the PXE-booting port in ironic. Nodes must have at least one enrolled port prior to introspection in this case.

The following plugins are enabled by default, but can be disabled if not needed:


reports error, if error field is set by the ramdisk, also optionally stores logs from logs field, see the API reference for details.


detect node capabilities: CPU, boot mode, etc. See Capabilities Detection for more details.


gathers the list of all PCI devices returned by the ramdisk and compares to those defined in alias field(s) from pci_devices section of configuration file. The recognized PCI devices and their count are then stored in node properties. This information can be later used in nova flavors for node scheduling.

Here are some plugins that can be additionally enabled:


example plugin logging it’s input and output.


gathers block devices from ramdisk and exposes root device in multiple runs.


stores the value of the ‘data’ key returned by the ramdisk as a JSON encoded string in a Swift object. The plugin will also attempt to convert the data into a format usable by introspection rules. If this is successful then the new format will be stored in the ‘extra’ key. The ‘data’ key is then deleted from the introspection data, as unless converted it’s assumed unusable by introspection rules.


Processes LLDP data returned from inspection, parses TLVs from the Basic Management (802.1AB), 802.1Q, and 802.3 sets and stores the processed data back in the Ironic inspector database. To enable LLDP in the inventory from IPA, ipa-collect-lldp=1 should be passed as a kernel parameter to the IPA ramdisk.


Processes LLDP data returned from inspection, specifically looking for the port ID and chassis ID. If found, it configures the local link connection information on the Ironic ports with that data. To enable LLDP in the inventory from IPA, ipa-collect-lldp=1 should be passed as a kernel parameter to the IPA ramdisk. In order to avoid processing the raw LLDP data twice, the lldp_basic plugin should also be installed and run prior to this plugin.


Configures the physical_network property of the nodes Ironic port when the IP address is in a configured CIDR mapping. CIDR to physical network mappings is set in configuration using the [port_physnet]/cidr_map option, for example:

cidr_map =, 2001:db8::/64:physnet_b

Processes PCI data returned from inspection and compares with the accelerator inventory, it will update accelerator device information to the properties field of the ironic node if any accelerator device is found, for example:

{'local_gb': '1115', 'cpus': '40', 'cpu_arch': 'x86_64', 'memory_mb': '32768',
 'capabilities': 'boot_mode:bios,cpu_vt:true,cpu_aes:true,cpu_hugepages:true,cpu_hugepages_1g:true,cpu_txt:true',
 'accel': [{'vendor_id': '10de', 'device_id': '1eb8', 'type': 'GPU',
            'pci_address': '0000:82:00.0',
            'device_info': 'NVIDIA Corporation Tesla T4'}]

Refer to How To Contribute for information on how to write your own plugin.


Starting from Mitaka, ironic-inspector is able to register new nodes in Ironic.

The existing node-not-found-hook handles what happens if ironic-inspector receives inspection data from a node it can not identify. This can happen if a node is manually booted without registering it with Ironic first.

For discovery, the configuration file option node_not_found_hook should be set to load the hook called enroll. This hook will enroll the unidentified node into Ironic using the fake-hardware hardware type. This is a configurable option: set enroll_node_driver in the ironic-inspector configuration file to the hardware type you want. You can also configure arbitrary fields to set on discovery, for example:

enroll_node_driver = ipmi
enroll_node_fields = management_interface:noop,resource_class:baremetal

The enroll hook will also set the ipmi_address property on the new node, if its available in the introspection data we received, see ramdisk callback.

Once the enroll hook is finished, ironic-inspector will process the introspection data in the same way it would for an identified node. It runs the processing plugins, and after that it runs introspection rules, which would allow for more customisable node configuration, see rules.

A rule to set a node’s Ironic driver to ipmi and populate the required driver_info for that driver would look like:

    "description": "Set IPMI driver_info if no credentials",
    "actions": [
        {"action": "set-attribute", "path": "driver", "value": "ipmi"},
        {"action": "set-attribute", "path": "driver_info/ipmi_username",
         "value": "username"},
        {"action": "set-attribute", "path": "driver_info/ipmi_password",
         "value": "password"}
    "conditions": [
        {"op": "is-empty", "field": "node://driver_info.ipmi_password"},
        {"op": "is-empty", "field": "node://driver_info.ipmi_username"}
    "description": "Set deploy info if not already set on node",
    "actions": [
        {"action": "set-attribute", "path": "driver_info/deploy_kernel",
         "value": "<glance uuid>"},
        {"action": "set-attribute", "path": "driver_info/deploy_ramdisk",
         "value": "<glance uuid>"}
    "conditions": [
        {"op": "is-empty", "field": "node://driver_info.deploy_ramdisk"},
        {"op": "is-empty", "field": "node://driver_info.deploy_kernel"}

All nodes discovered and enrolled via the enroll hook, will contain an auto_discovered flag in the introspection data, this flag makes it possible to distinguish between manually enrolled nodes and auto-discovered nodes in the introspection rules using the rule condition eq:

    "description": "Enroll auto-discovered nodes with ipmi hardware type",
    "actions": [
        {"action": "set-attribute", "path": "driver", "value": "ipmi"}
    "conditions": [
        {"op": "eq", "field": "data://auto_discovered", "value": true}

Reapplying introspection on stored data

To allow correcting mistakes in introspection rules the API provides an entry point that triggers the introspection over stored data. The data to use for processing is kept in Swift separately from the data already processed. Reapplying introspection overwrites processed data in the store. Updating the introspection data through the endpoint isn’t supported yet. Following preconditions are checked before reapplying introspection:

  • no data is being sent along with the request

  • Swift store is configured and enabled

  • introspection data is stored in Swift for the node UUID

  • node record is kept in database for the UUID

  • introspection is not ongoing for the node UUID

Should the preconditions fail an immediate response is given to the user:

  • 400 if the request contained data or in case Swift store is not enabled in configuration

  • 404 in case Ironic doesn’t keep track of the node UUID

  • 409 if an introspection is already ongoing for the node

If the preconditions are met a background task is executed to carry out the processing and a 202 Accepted response is returned to the endpoint user. As requested, these steps are performed in the background task:

  • preprocessing hooks

  • post processing hooks, storing result in Swift

  • introspection rules

These steps are avoided, based on the feature requirements:

  • node_not_found_hook is skipped

  • power operations

  • roll-back actions done by hooks


  • there’s no way to update the unprocessed data atm.

  • the unprocessed data is never cleaned from the store

  • check for stored data presence is performed in background; missing data situation still results in a 202 response

Capabilities Detection

Starting with the Newton release, Ironic Inspector can optionally discover several node capabilities. A recent (Newton or newer) IPA image is required for it to work.

Boot mode

The current boot mode (BIOS or UEFI) can be detected and recorded as boot_mode capability in Ironic. It will make some drivers to change their behaviour to account for this capability. Set the [capabilities]boot_mode configuration option to True to enable.

CPU capabilities

Several CPU flags are detected by default and recorded as following capabilities:

  • cpu_aes AES instructions.

  • cpu_vt virtualization support.

  • cpu_txt TXT support.

  • cpu_hugepages huge pages (2 MiB) support.

  • cpu_hugepages_1g huge pages (1 GiB) support.

It is possible to define your own rules for detecting CPU capabilities. Set the [capabilities]cpu_flags configuration option to a mapping between a CPU flag and a capability, for example:

cpu_flags = aes:cpu_aes,svm:cpu_vt,vmx:cpu_vt

See the default value of this option for a more detail example.

InfiniBand support

Starting with the Ocata release, Ironic Inspector supports detection of InfiniBand network interfaces. A recent (Ocata or newer) IPA image is required for that to work. When an InfiniBand network interface is discovered, the Ironic Inspector adds a client-id attribute to the extra attribute in the ironic port. The Ironic Inspector should be configured with iptables.ethoib_interfaces to indicate the Ethernet Over InfiniBand (EoIB) which are used for physical access to the DHCP network. For example if Ironic Inspector DHCP server is using br-inspector and the br-inspector has EoIB port e.g. eth0, the iptables.ethoib_interfaces should be set to eth0. The iptables.ethoib_interfaces allows to map the baremetal GUID to it’s EoIB MAC based on the neighs files. This is needed for blocking DHCP traffic of the nodes (MACs) which are not part of the introspection.

The format of the /sys/class/net/<ethoib>/eth/neighs file:

# EMAC=<ethernet mac of the ethoib> IMAC=<qp number:lid:GUID>
# For example:
qp number=97:fe

Example of content:

EMAC=02:00:02:97:00:01 IMAC=97:fe:80:00:00:00:00:00:00:7c:fe:90:03:00:29:26:52
EMAC=02:00:00:61:00:02 IMAC=61:fe:80:00:00:00:00:00:00:7c:fe:90:03:00:29:24:4f