=============== Node Deployment =============== .. contents:: :depth: 2 Overview ======== Node deployment is performed by the Bare Metal service to prepare a node for use by a workload. The exact work flow used depends on a number of factors, including the hardware type and interfaces assigned to a node. Deploy Steps ============ The Bare Metal service implements deployment by collecting a list of deploy steps to perform on a node from the Power, Deploy, Management, BIOS, and RAID interfaces of the driver assigned to the node. These steps are then ordered by priority and executed on the node when the node is moved to the ``deploying`` state. Nodes move to the ``deploying`` state when attempting to move to the ``active`` state (when the hardware is prepared for use by a workload). For a full understanding of all state transitions into deployment, please see :doc:`/user/states`. The Bare Metal service added support for deploy steps in the Rocky release. Order of execution ------------------ Deploy steps are ordered from higher to lower priority, where a larger integer is a higher priority. If the same priority is used by deploy steps on different interfaces, the following resolution order is used: Power, Management, Deploy, BIOS, and RAID interfaces. .. _node-deployment-core-steps: Agent steps ----------- All deploy interfaces based on ironic-python-agent (i.e. ``direct``, ``ansible`` and any derivatives) expose the following deploy steps: ``deploy.deploy`` (priority 100) In this step the node is booted using a provisioning image. ``deploy.write_image`` (priority 80) An out-of-band (``ansible``) or in-band (``direct``) step that downloads and writes the image to the node. ``deploy.tear_down_agent`` (priority 40) In this step the provisioning image is shut down. ``deploy.switch_to_tenant_network`` (priority 30) In this step networking for the node is switched from provisioning to tenant networks. ``deploy.boot_instance`` (priority 20) In this step the node is booted into the user image. Additionally, the ``direct`` deploy interfaces has: ``deploy.prepare_instance_boot`` (priority 60) In this step the boot device is configured and the bootloader is installed. .. note:: For the ``ansible`` deploy interface these steps are done in ``deploy.write_image``. Accordingly, the following priority ranges can be used for custom deploy steps: > 100 Out-of-band steps to run before deployment. 81 to 99 In-band deploy steps to run before the image is written. 61 to 79 In-band deploy steps to run after the image is written but before the bootloader is installed. 41 to 59 In-band steps to run after the image is written the bootloader is installed. 21 to 39 Out-of-band steps to run after the provisioning image is shut down. 1 to 19 Any steps that are run when the user instance is already running. In-band steps ------------- More deploy steps can be provided by the ramdisk, see :ironic-python-agent-doc:`IPA hardware managers documentation ` for a listing. .. _standalone-deploy-steps: Requesting steps ---------------- Starting with Bare Metal API version 1.69 user can optionally supply deploy steps for node deployment when invoking deployment or rebuilding. Overlapping steps will take precedence over `Agent steps`_ and `Deploy Templates`_ steps. Using "baremetal" client deploy steps can be passed via ``--deploy-steps`` argument. The argument ``--deploy-steps`` is one of: - a JSON string - path to a JSON file whose contents are passed to the API - '-', to read from stdin. This allows piping in the deploy steps. An example by passing a JSON string: .. code-block:: console baremetal node deploy \ --deploy-steps '[{"interface": "bios", "step": "apply_configuration", "args": {"settings": [{"name": "LogicalProc", "value": "Enabled"}]}, "priority": 150}]' Format of JSON for deploy steps argument is described in `Deploy step format`_ section. .. note:: Starting with `ironicclient` 4.6.0 you can provide a YAML file for ``--deploy-steps``. Excluding the default steps --------------------------- Starting with the Xena release, you can use the new :ref:`custom-agent-deploy` interface to exclude the default step ``write_image`` and skip bootloader installation in the ``prepare_instance_boot`` step. Writing a Deploy Step --------------------- Please refer to :doc:`/contributor/deploy-steps`. FAQ --- What deploy step is running? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ To check what deploy step the node is performing or attempted to perform and failed, run the following command; it will return the value in the node's ``driver_internal_info`` field:: baremetal node show -f value -c driver_internal_info The ``deploy_steps`` field will contain a list of all remaining steps with their priorities, and the first one listed is the step currently in progress or that the node failed before going into ``deploy failed`` state. Troubleshooting --------------- If deployment fails on a node, the node will be put into the ``deploy failed`` state until the node is deprovisioned. A deprovisioned node is moved to the ``available`` state after the cleaning process has been performed successfully. Strategies for determining why a deploy step failed include checking the ironic conductor logs, checking logs from the ironic-python-agent that have been stored on the ironic conductor, or performing general hardware troubleshooting on the node. Deploy Templates ================ Starting with the Stein release, with Bare Metal API version 1.55, deploy templates offer a way to define a set of one or more deploy steps to be executed with particular sets of arguments and priorities. Each deploy template has a name, which must be a valid trait. Traits can be either standard or custom. Standard traits are listed in the :os-traits-doc:`os_traits library <>`. Custom traits must meet the following requirements: * prefixed with ``CUSTOM_`` * contain only upper case characters A to Z, digits 0 to 9, or underscores * no longer than 255 characters in length Deploy step format ------------------ An invocation of a deploy step is defined in a deploy template as follows:: { "interface": "", "step": "", "args": { "": "", "": "" }, "priority": } A deploy template contains a list of one or more such steps. Each combination of `interface` and `step` may only be specified once in a deploy template. Matching deploy templates ------------------------- During deployment, if any of the traits in a node's ``instance_info.traits`` field match the name of a deploy template, then the steps from that deploy template will be added to the list of steps to be executed by the node. When using the Compute service, any traits in the instance's flavor properties or image properties are stored in ``instance_info.traits`` during deployment. See :ref:`scheduling-traits` for further information on how traits are used for scheduling when the Bare Metal service is used with the Compute service. Note that there is no ongoing relationship between a node and any templates that are matched during deployment. The set of matching deploy templates is checked at deployment time. Any subsequent updates to or deletion of those templates will not be reflected in the node's configuration unless it is redeployed or rebuilt. Similarly, if a node is rebuilt and the set of matching deploy templates has changed since the initial deployment, then the resulting configuration of the node may be different from the initial deployment. Overriding default deploy steps ------------------------------- A deploy step is enabled by default if it has a non-zero default priority. A default deploy step may be overridden in a deploy template. If the step's priority is a positive integer it will be executed with the specified priority and arguments. If the step's priority is zero, the step will not be executed. If the :ref:`deploy.deploy step ` is included in a deploy template, it can only be assigned a priority of zero to disable it. Creating a deploy template via API ---------------------------------- A deploy template can be created using the Bare Metal API:: POST /v1/deploy_templates Here is an example of the body of a request to create a deploy template with a single step: .. code-block:: json { "name": "CUSTOM_HYPERTHREADING_ON", "steps": [ { "interface": "bios", "step": "apply_configuration", "args": { "settings": [ { "name": "LogicalProc", "value": "Enabled" } ] }, "priority": 150 } ] } Further information on this API is available `here `__. Creating a deploy template via "baremetal" client ----------------------------------------------------------- A deploy template can be created via the ``baremetal deploy template create`` command, starting with ``python-ironicclient`` 2.7.0. The argument ``--steps`` must be specified. Its value is one of: - a JSON string - path to a JSON file whose contents are passed to the API - '-', to read from stdin. This allows piping in the deploy steps. Example of creating a deploy template with a single step using a JSON string: .. code-block:: console baremetal deploy template create \ CUSTOM_HYPERTHREADING_ON \ --steps '[{"interface": "bios", "step": "apply_configuration", "args": {"settings": [{"name": "LogicalProc", "value": "Enabled"}]}, "priority": 150}]' Or with a file: .. code-block:: console baremetal deploy template create \ CUSTOM_HYPERTHREADING_ON \ ---steps my-deploy-steps.txt Or with stdin: .. code-block:: console cat my-deploy-steps.txt | baremetal deploy template create \ CUSTOM_HYPERTHREADING_ON \ --steps - Example of use with the Compute service --------------------------------------- .. note:: The deploy steps used in this example are for example purposes only. In the following example, we first add the trait ``CUSTOM_HYPERTHREADING_ON`` to the node represented by ````: .. code-block:: console baremetal node add trait CUSTOM_HYPERTHREADING_ON We also update the flavor ``bm-hyperthreading-on`` in the Compute service with the following property: .. code-block:: console openstack flavor set --property trait:CUSTOM_HYPERTHREADING_ON=required bm-hyperthreading-on Creating a Compute instance with this flavor will ensure that the instance is scheduled only to Bare Metal nodes with the ``CUSTOM_HYPERTHREADING_ON`` trait. We could then create a Bare Metal deploy template with the name ``CUSTOM_HYPERTHREADING_ON`` and a deploy step that enables Hyperthreading: .. code-block:: json { "name": "CUSTOM_HYPERTHREADING_ON", "steps": [ { "interface": "bios", "step": "apply_configuration", "args": { "settings": [ { "name": "LogicalProc", "value": "Enabled" } ] }, "priority": 150 } ] } When an instance is created using the ``bm-hyperthreading-on`` flavor, then the deploy steps of deploy template ``CUSTOM_HYPERTHREADING_ON`` will be executed during the deployment of the scheduled node, causing Hyperthreading to be enabled in the node's BIOS configuration. To make this example more dynamic, let's add a second trait ``CUSTOM_HYPERTHREADING_OFF`` to the node: .. code-block:: console baremetal node add trait CUSTOM_HYPERTHREADING_OFF We could also update a second flavor, ``bm-hyperthreading-off``, with the following property: .. code-block:: console openstack flavor set --property trait:CUSTOM_HYPERTHREADING_OFF=required bm-hyperthreading-off Finally, we create a deploy template with the name ``CUSTOM_HYPERTHREADING_OFF`` and a deploy step that disables Hyperthreading: .. code-block:: json { "name": "CUSTOM_HYPERTHREADING_OFF", "steps": [ { "interface": "bios", "step": "apply_configuration", "args": { "settings": [ { "name": "LogicalProc", "value": "Disabled" } ] }, "priority": 150 } ] } Creating a Compute instance with the ``bm-hyperthreading-off`` instance will cause the scheduled node to have Hyperthreading disabled in the BIOS during deployment. We now have a way to create Compute instances with different configurations, by choosing between different Compute flavors, supported by a single Bare Metal node that is dynamically configured during deployment.