drydock/doc/source/blueprints/build_data.rst

Drydock Build Data

Some site data is not known before the deployment of physical nodes begins. Currently there is no method to harvest and persist this data for later reporting or usage downstream in the deployment process. This blueprint for adding Drydock support for harvesting, persisting, and reporting this build-time data.

Overview

Build data is any data that is unknown until a site deployment actually begins. It can be harvested any time during the deployment and will be persisted so that it is available via the Drydock API for reporting. Each data element collected will also be associated with the Drydock task that initiated the harvesting. When requesting the details of the task, a client can optionally request the build data harvested by that task directly be attached. Each build data element will be described by the following fields.

• Date/time - Same type of data can be collected multiple times and archived.
• Task - The Drydock Task ID that initiated the collection.
• Node - The node on which the data is collected.
• Generator - A description of what generated the data. If it was a command line tool, the full command line. If it was something else, then a solid description such as an API endpoint.
• Format - The format that the collected data is being persisted as.

Post-collection, the build data will be accessible in two ways

1. Using the new builddata endpoint under the /nodes/ resource. See below for details.
2. By requesting the details for the initiating task from the /api/v1.0/tasks resource and including the builddata=true parameter to the request.

Currently no pruning system is in place, but if storage is a concern that can be added as a follow-on feature.

Data Schema

A new table build_data with the following columns. No keys.

• task_id - 128-bit binary task ID of the Drydock task that collected the build data.
• collected_date - The datestamp when the data was collected.
• generator - Description of the command or source of the build data.
• node_name - The node the data is collected from.
• format - The MIME-type of the storage format of the persisted data.
• data_element - The data collected serialized in the format.

Build Data API

A new API endpoint of /api/v1.0/nodes/{node}/builddata/ will be added to the API to retrieve the build data for a node. This endpoint will only support a GET request and supports a single query parameter of latest which defaults to true. If true then the response will contain only the most recent data_element for each generator. If the parameter is false then the response will contain an ordered sequence of all data_elements for each generator in a descending time series.

The existing /api/v1.0/tasks/{task_id}/ endpoint will be updated to support a query parameter of builddata that defaults to false. If set to true, the response with the task details will include any build data collected during the execution of the task.

Expected Use Cases

Device Aliases

The first use case is collecting data from lshw to resolve device bus addresses into operating system device names. This is done for supporting the device aliases in the HardwareProfile.

Network Topology

During node deployment, LLDP (link level discovery protocol) can be used to validate the network topology. The LLDP output can be collected and audited against expected switch configurations.

Burn In Performance

New hardware can run burn-in routines to collect performance and stability information before production workloads are installed.