Hardware introspection daemon for OpenStack Ironic
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Go to file
Dmitry Tantsur a0884628cb
Add DevStack plugin for ironic-discoverd
8 years ago
devstack Add DevStack plugin for ironic-discoverd 8 years ago
functest Switch to oslo.config 8 years ago
ironic_discoverd Clean up firewall rules on exit 8 years ago
locale Add scripts to manage translations 8 years ago
.gitignore Small sdist-related cleanup 8 years ago
.gitreview Post-migration updates for stackforge and launchpad 8 years ago
CONTRIBUTING.rst Documentation update 8 years ago
HTTP-API.rst Documentation update 8 years ago
LICENSE Apache license 9 years ago
MANIFEST.in Add DevStack plugin for ironic-discoverd 8 years ago
README.rst Switch to oslo.config 8 years ago
babel.cfg Add scripts to manage translations 8 years ago
example.conf Add option to delete ports after introspection 8 years ago
ironic-discoverd.8 Simple man page 9 years ago
plugin-requirements.txt Getting ready for inclusion into projects.yaml 8 years ago
requirements.txt Update from global requirements 8 years ago
setup.cfg Add scripts to manage translations 8 years ago
setup.py Add DevStack plugin for ironic-discoverd 8 years ago
test-requirements.txt Getting ready for inclusion into projects.yaml 8 years ago
tox.ini Switch to oslo.config 8 years ago


Hardware introspection for OpenStack Ironic

This is an auxiliary service for discovering hardware properties for a node managed by OpenStack Ironic. Hardware introspection or hardware properties discovery is a process of getting hardware parameters required for scheduling from a bare metal node, given it's power management credentials (e.g. IPMI address, user name and password).

A special discovery ramdisk is required to collect the information on a node. The default one can be built using diskimage-builder and ironic-discoverd-ramdisk element (see Configuration below).

Support for ironic-discoverd is present in Tuskar UI --OpenStack Horizon plugin for TripleO.

ironic-discoverd requires OpenStack Juno (2014.2) release or newer.

Please use launchpad to report bugs and ask questions. Use PyPI for downloads and accessing the released version of this README. Refer to CONTRIBUTING.rst for instructions on how to contribute.


Usual hardware introspection flow is as follows:

  • Operator installs undercloud with ironic-discoverd (e.g. using instack-undercloud).
  • Operator enrolls nodes into Ironic either manually or by uploading CSV file to Tuskar UI. Power management credentials should be provided to Ironic at this step.
  • Operator sends nodes on introspection either manually using ironic-discoverd API (see Usage) or again via Tuskar UI.
  • On receiving node UUID ironic-discoverd:
    • validates node power credentials, current power and provisioning states,
    • allows firewall access to PXE boot service for the nodes,
    • issues reboot command for the nodes, so that they boot the discovery ramdisk.
  • The discovery ramdisk collects the required information and posts it back to ironic-discoverd.
  • On receiving data from the discovery ramdisk, ironic-discoverd:
    • validates received data,
    • finds the node in Ironic database using it's BMC address (MAC address in case of SSH driver),
    • fills missing node properties with received data and creates missing ports.
  • Separate API (see Usage) can be used to query introspection results for a given node.

Starting DHCP server and configuring PXE boot environment is not part of this package and should be done separately.


ironic-discoverd is available as an RPM from Fedora 22 repositories or from Juno (and later) RDO for Fedora 20, 21 and EPEL 7. It will be installed and preconfigured if you used instack-undercloud to build your undercloud. Otherwise after enabling required repositories install it using:

yum install openstack-ironic-discoverd

To install only Python packages (including the client), use:

yum install python-ironic-discoverd

Alternatively (e.g. if you need the latest version), you can install package from PyPI (you may want to use virtualenv to isolate your environment):

pip install ironic-discoverd

Finally, there is a DevStack plugin for ironic-discoverd - see https://etherpad.openstack.org/p/DiscoverdDevStack for the current status.


Copy example.conf to some permanent place (/etc/ironic-discoverd/discoverd.conf is what is used in the RPM). Fill in at least these configuration values:

  • os_username, os_password, os_tenant_name - Keystone credentials to use when accessing other services and check client authentication tokens;
  • os_auth_url, identity_uri - Keystone endpoints for validating authentication tokens and checking user roles;
  • database - where you want ironic-discoverd SQLite database to be placed;
  • dnsmasq_interface - interface on which dnsmasq (or another DHCP service) listens for PXE boot requests (defaults to br-ctlplane which is a sane default for TripleO based installations but is unlikely to work for other cases).

See comments inside example.conf for the other possible configuration options.


Configuration file contains a password and thus should be owned by root and should have access rights like 0600.

As for PXE boot environment, you'll need:

  • TFTP server running and accessible (see below for using dnsmasq). Ensure pxelinux.0 is present in the TFTP root.

  • Build and put into your TFTP directory kernel and ramdisk from the diskimage-builder ironic-discoverd-ramdisk element:

    ramdisk-image-create -o discovery fedora ironic-discoverd-ramdisk

    You need diskimage-builder 0.1.38 or newer to do it (using the latest one is always advised).

  • You need PXE boot server (e.g. dnsmasq) running on the same machine as ironic-discoverd. Don't do any firewall configuration: ironic-discoverd will handle it for you. In ironic-discoverd configuration file set dnsmasq_interface to the interface your PXE boot server listens on. Here is an example dnsmasq.conf:

    dhcp-range={DHCP IP RANGE, e.g.,}
    tftp-root={TFTP ROOT, e.g. /tftpboot}
  • Configure your $TFTPROOT/pxelinux.cfg/default with something like:

    default discover
    label discover
    kernel discovery.kernel
    append initrd=discovery.initramfs discoverd_callback_url=http://{IP}:5050/v1/continue
    ipappend 3

    Replace {IP} with IP of the machine (do not use loopback interface, it will be accessed by ramdisk on a booting machine).


    There are some prebuilt images which use obsolete ironic_callback_url instead of discoverd_callback_url. Modify pxelinux.cfg/default accordingly if you have one of these.

Here is discoverd.conf you may end up with:

debug = false
identity_uri =
os_auth_url =
os_username = admin
os_password = password
os_tenant_name = admin
dnsmasq_interface = br-ctlplane


Set debug = true if you want to see complete logs.


If you installed ironic-discoverd from the RPM, you already have a systemd unit, so you can:

systemctl enable openstack-ironic-discoverd
systemctl start openstack-ironic-discoverd

Otherwise run as root:

ironic-discoverd --config-file /etc/ironic-discoverd/discoverd.conf


Running as root is not required if ironic-discoverd does not manage the firewall (i.e. manage_firewall is set to false in the configuration file).

A good starting point for writing your own systemd unit should be one used in Fedora.


ironic-discoverd has a simple client library for Python and a CLI tool bundled with it.

Client library is in module ironic_discoverd.client, every call accepts additional optional arguments:

  • base_url ironic-discoverd API endpoint, defaults to,
  • auth_token Keystone authentication token.

CLI tool is based on OpenStackClient with prefix openstack baremetal introspection. Accepts optional argument --discoverd-url with the ironic-discoverd API endpoint.

  • Start introspection on a node:

    introspect(uuid, new_ipmi_username=None, new_ipmi_password=None)

    $ openstack baremetal introspection start UUID [--new-ipmi-password=PWD [--new-ipmi-username=USER]]
    • uuid - Ironic node UUID;
    • new_ipmi_username and new_ipmi_password - if these are set, ironic-discoverd will switch to manual power on and assigning IPMI credentials on introspection. See Setting IPMI Credentials for details.
  • Query introspection status:


    $ openstack baremetal introspection status UUID
    • uuid - Ironic node UUID.

Refer to HTTP-API.rst for information on the HTTP API.

Setting IPMI Credentials

If you have physical access to your nodes, you can use ironic-discoverd to set IPMI credentials for them without knowing the original ones. The workflow is as follows:

  • Ensure nodes will PXE boot on the right network by default.
  • Set enable_setting_ipmi_credentials = true in the ironic-discoverd configuration file.
  • Enroll nodes in Ironic with setting their ipmi_address only. This step allows ironic-discoverd to distinguish nodes.
  • Set maintenance mode on nodes. That's an important step, otherwise Ironic might interfere with introspection process.
  • Start introspection with providing additional parameters:
    • new_ipmi_password IPMI password to set,
    • new_ipmi_username IPMI user name to set, defaults to one in node driver_info.
  • Manually power on the nodes and wait.
  • After introspection is finished (watch nodes power state or use ironic-discoverd status API) you can turn maintenance mode off.

Note that due to various limitations on password value in different BMC, ironic-discoverd will only accept passwords with length between 1 and 20 consisting only of letters and numbers.


ironic-discoverd 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.

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.


validates network interfaces information.

Here are some plugins that can be additionally enabled:


reports error, if error field is set by the ramdisk.


example plugin logging it's input and output.


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


plugin for eDeploy hardware detection and classification utilities, requires a special ramdisk.

Refer to CONTRIBUTING.rst for information on how to write your own plugin.

Release Notes

1.1 Series

See 1.1.0 release tracking page for details.

Upgrade Notes

  • This version no longer supports ancient ramdisks that sent macs instead of interfaces. It also raises exception if no valid interfaces were found after processing.

  • identity_uri parameter should be set to Keystone admin endpoint.

  • overwrite_existing is now enabled by default.

  • Running the service as :

    $ ironic-discoverd /path/to/config

    is no longer supported, use :

    $ ironic-discoverd --config-file /path/to/config

Major Features

  • Default to only creating a port for the NIC that the ramdisk was PXE booted from, if such information is provided by ramdisk as boot_interface field. Adjustable by add_ports option.

    See better-boot-interface-detection blueprint for details.

  • Setting IPMI Credentials feature is considered stable now and is exposed in the client. It still needs to be enabled via configuration.

    See setup-ipmi-credentials-take2 blueprint for what changed since 1.0.0 (tl;dr: everything).

  • Proper CLI tool implemented as a plugin for OpenStackClient.

  • The default value for overwrite_existing configuration option was flipped, matching the default behavior for Ironic inspection.

  • Switch to oslo.config for configuration management (many thanks to Yuiko Takada).

Other Changes

  • New option add_ports allows precise control over which ports to add, replacing deprecated ports_for_inactive_interfaces.

  • Experimental plugin edeploy to use with eDeploy hardware detection and classification utilities.

    See eDeploy blueprint for details.

  • Plugin root_device_hint for in-band root device discovery.

  • Serious authentication issues were fixed, keystonemiddleware is a new requirement.

  • Basic support for i18n via oslo.i18n.

Known Issues

1.0 Series

1.0 is the first feature-complete release series. It's also the first series to follow standard OpenStack processes from the beginning. All 0.2 series users are advised to upgrade.

See 1.0.0 release tracking page for details.

1.0.1 release

This maintenance fixed serious problem with authentication and unfortunately brought new upgrade requirements:

  • Dependency on keystonemiddleware;
  • New configuration option identity_uri, defaulting to localhost.

Upgrade notes

Action required:

  • Fill in database option in the configuration file before upgrading.
  • Stop relying on ironic-discoverd setting maintenance mode itself.
  • Stop relying on discovery_timestamp node extra field.

Action recommended:

  • Switch your init scripts to use ironic-discoverd --config-file <path> instead of just ironic-discoverd <path>.
  • Stop relying on on_discovery and newly_discovered being set in node extra field during and after introspection. Use new get status HTTP endpoint and client API instead.
  • Switch from discover to introspect HTTP endpoint and client API.

Major features

  • Introspection now times out by default, set timeout option to alter.

  • New API GET /v1/introspection/<uuid> and client.get_status for getting discovery status.

    See get-status-api blueprint for details.

  • New API POST /v1/introspection/<uuid> and client.introspect is now used to initiate discovery, /v1/discover is deprecated.

    See v1 API reform blueprint for details.

  • /v1/continue is now sync:

    • Errors are properly returned to the caller
    • This call now returns value as a JSON dict (currently empty)
  • Add support for plugins that hook into data processing pipeline. Refer to Plugins for information on bundled plugins and to CONTRIBUTING.rst for information on how to write your own.

    See plugin-architecture blueprint for details.

  • Support for OpenStack Kilo release and new Ironic state machine -see Kilo state machine blueprint.

    As a side effect, no longer depend on maintenance mode for introspection. Stop putting node in maintenance mode before introspection.

  • Cache nodes under introspection in a local SQLite database. database configuration option sets where to place this database. Improves performance by making less calls to Ironic API and makes possible to get results of introspection.

Other Changes

  • Firewall management can be disabled completely via manage_firewall option.

  • Experimental support for updating IPMI credentials from within ramdisk.

    Enable via configuration option enable_setting_ipmi_credentials. Beware that this feature lacks proper testing, is not supported officially yet and is subject to changes without keeping backward compatibility.

    See setup-ipmi-credentials blueprint for details.

Known Issues

  • bug 1415040 it is required to set IP addresses instead of host names in ipmi_address/ilo_address/drac_host node driver_info field for ironic-discoverd to work properly.

0.2 Series

0.2 series is designed to work with OpenStack Juno release. Not supported any more.

0.1 Series

First stable release series. Not supported any more.