awx/docs/inventory_refresh.md

Inventory Refresh Overview

Tower should have an inventory view that is more aligned towards systems management rather than merely maintaining inventory for automation.

Inventory Source Promotion

Starting with Tower 3.2, InventorySource will be associated directly with an Inventory.

API Concerns / Deprecation

The group field for InventorySource has been renamed to deprecated_group and will be removed from InventorySource completely in Tower 3.3. As a result the related field on Group , inventory_source has been renamed deprecated_inventory_source and will also be removed in Tower 3.3.

Fact Searching

Facts generated by an Ansible playbook during a Job Template run are stored by Tower into the database whenever use_fact_cache=True is set per-Job-Template. New facts are merged with existing facts and are per-host. These stored facts can be used to filter hosts via the /api/v2/hosts endpoint, using the GET query parameter host_filter i.e. /api/v2/hosts?host_filter=ansible_facts__ansible_processor_vcpus=8

The grammer of host_filter allows for:

• grouping via ()
• the boolean and operator
• __ to reference related fields in relational fields
• __ is used on ansible_facts to separate keys in a JSON key path
• [] is used to denote a json array in the path specification
• "" can be used in the value when spaces are wanted in the value
• "classic" Django queries may be embedded in the host_filter

Examples:

/api/v2/hosts/?host_filter=name=localhost
/api/v2/hosts/?host_filter=ansible_facts__ansible_date_time__weekday_number="3"
/api/v2/hosts/?host_filter=ansible_facts__ansible_processor[]="GenuineIntel"
/api/v2/hosts/?host_filter=ansible_facts__ansible_lo__ipv6[]__scope="host"
/api/v2/hosts/?host_filter=ansible_facts__ansible_processor_vcpus=8
/api/v2/hosts/?host_filter=ansible_facts__ansible_env__PYTHONUNBUFFERED="true"
/api/v2/hosts/?host_filter=(name=localhost or name=database) and (groups__name=east or groups__name="west coast") and ansible_facts__ansible_processor_vcpus=8

Smart Inventory

Starting in Tower 3.2, Tower will support the ability to define a Smart Inventory. You will define the inventories using the same language we currently support in our Smart Search.

Inventory Changes

• The Inventory model has a new field called kind. The default of this field will be blank for normal inventories and set to smart for smart inventories.

• Inventory model has a new field called host_filter. The default of this field will be blank for normal inventories. When host_filter is set AND the inventory kind is set to smart is the combination that makes a Smart Inventory.

• Host model has a new field called smart_inventories. This field uses the SmartInventoryMemberships lookup table to provide a set of all of the Smart Inventory a host is a part of. The memberships are generated by the update_host_smart_inventory_memberships task. This task is called when the view for /api/v2/hosts/:id/smart_inventories is materialized. NOTE: This task is only run if the AWX_REBUILD_SMART_MEMBERSHIP is set to True. It defaults to False.

Smart Filter (host_filter)

The SmartFilter class handles our translation of the smart search string. We store the filter value in the host_filter field for an inventory. This value should be expressed the same way we express our existing smart searches.

host_filter="search=foo"
host_filter="group__search=bar"
host_filter="search=baz and group__search=bang"
host_filter="name=localhost or group__name=local"

Creating a new Smart Inventory for all of our GCE and EC2 groups might look like this:

HTTP POST /api/v2/inventories/

{
    "name": "GCE and EC2 Smart Inventory",
    "kind": "smart",
    "host_filter": "group__search=ec2 and group__search=gce"
    ...
}

More On Searching

The host_filter you set will search over the entirety of the hosts you have access to in Tower. If you want to restrict your search in anyway, you will want to declare that in your host filter.

For example, if you want to restrict the search to only hosts in an inventory named "US-East", you would create a host_filter that looked something like this:

{
    "name": "NYC Hosts",
    "kind": "smart",
    "host_filter": "inventory__name='US-East' and search='nyc'",
    ...
}

In the above example, you are limiting the search to the "US-East" inventory and hosts with a name containing "nyc".

Acceptance Critera

When verifying acceptance we should ensure the following statements are true:

• Inventory has a new field named kind that defaults to empty and can only be set to smart.
• Inventory has a new field named host_filter to empty and can only be set to a valid SmartFilter string.
• Inventory with a host_filter set and a kind of smart will have a hosts list reflecting the results of searching /api/v2/hosts with the same search that is set in the host_filter.

API Concerns

There are no breaking or backwards incompatible changes for this feature.

Other Changes

Inventory update all inventory_sources

A new endpoint /api/v2/inventories/:id/update_inventory_sources has been added. This endpoint functions in the same way that /api/v2/inventory_source/:id/update functions for a single InventorySource with the exception that it updates all of the inventory sources for the Inventory.

HTTP GET /api/v2/inventories/:id/update_inventory_sources will list all of the inventory sources and if they will be updated when a POST to the same endpoint is made. The result of this request will look like this:

{
    results: [
        {"inventory_source": 1, "can_update": True},
        {"inventory_source": 2, "can_update": False},
    ]
}

When making a POST to the same endpoint, the response will contain a status as well as the job ID for the update.

POST /api/v2/inventories/:id/update_inventory_sources

{
    results: [
        {"inventory_update": 20, "inventory_source": 1, "status": "started"},
        {"inventory_update": 21, "inventory_source": 2, "status": "Could not start because `can_update` returned False"}
    ]
}

Background deletion of Inventory

InventorySource Hosts and Groups read-only