Added inventory concept docs, along with corresponding schema diagram
This commit is contained in:
Jim Baker
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doc/source/high-level-design.rst
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doc/source/high-level-design.rst
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Inventory
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=========
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Concepts
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--------
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The fundamental unit of inventory in Craton is a **device**, which has
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the following characteristics:
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Configurability
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A device is configurable, either directly over SSH with tooling
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like Ansible or indirectly via some controller.
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Configuration can be further divided as follows:
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* Version-controlled configuration, often captured in
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playbooks. It is the responsibility of workflows to use such
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configuration.
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* Config data stored in the inventory schema.
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In either case, the ultimate source may be manual, programmatic,
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or a combination of the two.
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Addressability
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A device has an IP address (specifically the control plane IP
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address).
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Hierarchy
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Devices are part of a hierarchy of regions and cells; a region in
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turn is part of a project.
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Labels
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Devices may be arbitrarily labeled. Such labels can describe
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physical layout -- cabinet, networking, power, etc -- along with
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logical usage -- compute service, etc. Labels are not in a
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hierarchy. (But should they be?)
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Some systems like Kubernetes use a key/value scheme for
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labels. This can be readily supported by the convention
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``key:value`` for the label name.
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A **host** is a concrete subclass of device, and corresponds to the
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equivalent Ansible concept: a host is directly configurable by an
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Ansible playbook over SSH. Hosts have associated SSH keys for such
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access.
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**Principals** interact (read and/or write) with inventory about
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devices. Governance for this interaction is mediated by RBAC and
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logged with respect to **change records** (including the reason for
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the change). Third party governance systems like OneOps can further
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structure these interactions. There are two classes of principals:
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Workflows
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Capture audits about inventory; which are in turn used for any
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remediation. The pattern of usage is bottom-up.
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Workflows are pluggable. They can be refined to a number of
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levels: Ansible, OpenStack Ansible, a specific workflow for
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managing patch levels with OSA (TODO does that actually make
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sense for OSA?).
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Note that a workflow can be run any number of times, against
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different subsets of inventory. Example: migrate a specific
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cabinet, as specified by a label. Think of this distinction as
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being like an Ansible playbook vs its play.
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Because workflows also know about version-controlled config,
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perhaps they can be used for queries as well. (TODO Ansible has
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some limited ways of determining such variables; it's possible OSA
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might develop this further as well in terms of role-based scheme.)
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Users
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Configure and query inventory. The pattern of usage is top-down,
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whether that's configuring a specific label or drilling down from
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a given cell.
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Users also can run workflows. This capability implies that
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workflows can be linked to roles; and that permissions include
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being the ability to run workflows.
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Principals
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Inventory interactions can be optionally logged. For example, if
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inventory is configured to use MySQL with InnoDB as its backing store,
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then all changes can be captured in the write-ahead log and reliably
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streamed to Kafka for analysis.
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Associated with each region, cell, label, and device are
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**variables**. Here are some aspects of variables:
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Description
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Variables are used to describe a device with config, auditing
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(possibly a subset of discovered facts), and other
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information. However variables do not store logging, metric, or
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monitoring information --- because of volume, such storage is best
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done in a separate database, such as timeseries DB.
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Key/value pairs
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Variables are made of up key/value pairs.
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Key
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Keys are strings; they are additionally restricted to be valid
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Python identifiers. We usually refer to these as **top-level
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keys**, because values can be arbitrarily complex JSON values.
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Such keys, and their prefixes, also serve as roles in Craton's
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implementation of RBAC. Keys are in a single namespace that does
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not differentiate between config or audit variables.
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Value
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Values are of JSON type, and can store arbitrary data as such,
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including binary data via base64 encoding. Workflows define these
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specifics.
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Scope resolution
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Variables use hierarchical scope to resolve for a specific device,
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using the following ordering:
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1. Region
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2. Cell
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3. Label; if a device has multiple labels, the labels are sorted
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alphanumerically
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4. Device
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Such resolution overrides at the lowest defined level, which
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allows for variables to describe a device with the "broadest
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possible brush". Overrides do not merge values, even if the value
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has keys embedded in it.
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In general, config variables should be set at the highest
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possible level; whereas audit data should be bottom up from
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device.
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Metadata
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Variables are also associated with the actor that wrote
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them, along with a record of change, including a note describing
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the change.
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It may be desirable to track other metadata about a variable: is
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this intended for config, vs discovered from an audit? But note
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this might be just a question of which actor wrote this variable:
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was it a user? (Config.) Or was it a workflow? (Audit/remediation,
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possibly further identified by workflow metadata.)
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Implementation
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--------------
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Craton's inventory is modeled using Python objects, which in turn has
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a concrete reference implementation using SQLAlchemy:
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.. image:: img/schema.svg
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:width: 660px
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:align: center
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:alt: ER model
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TODO(jimbaker): implementation of the inventory concepts is a work in
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progress, however, the above schema represents the current
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implementation. Notably missing are principals, including workflows
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and users, which will be added in the next phase of work.
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297
doc/source/img/schema.svg
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297
doc/source/img/schema.svg
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After Width: | Height: | Size: 27 KiB |
Reference in New Issue
Block a user