File: //usr/lib/python3.9/site-packages/ansible/plugins/inventory/__pycache__/constructed.cpython-39.pyc
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name: constructed
version_added: "2.4"
short_description: Uses Jinja2 to construct vars and groups based on existing inventory.
description:
- Uses a YAML configuration file with a valid YAML or C(.config) extension to define var expressions and group conditionals
- The Jinja2 conditionals that qualify a host for membership.
- The Jinja2 expressions are calculated and assigned to the variables
- Only variables already available from previous inventories or the fact cache can be used for templating.
- When I(strict) is False, failed expressions will be ignored (assumes vars were missing).
options:
plugin:
description: token that ensures this is a source file for the 'constructed' plugin.
required: True
choices: ['ansible.builtin.constructed', 'constructed']
use_vars_plugins:
description:
- Normally, for performance reasons, vars plugins get executed after the inventory sources complete the base inventory,
this option allows for getting vars related to hosts/groups from those plugins.
- The host_group_vars (enabled by default) 'vars plugin' is the one responsible for reading host_vars/ and group_vars/ directories.
- This will execute all vars plugins, even those that are not supposed to execute at the 'inventory' stage.
See vars plugins docs for details on 'stage'.
required: false
default: false
type: boolean
version_added: '2.11'
extends_documentation_fragment:
- constructed
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# inventory.config file in YAML format
plugin: ansible.builtin.constructed
strict: False
compose:
var_sum: var1 + var2
# this variable will only be set if I have a persistent fact cache enabled (and have non expired facts)
# `strict: False` will skip this instead of producing an error if it is missing facts.
server_type: "ansible_hostname | regex_replace ('(.{6})(.{2}).*', '\\2')"
groups:
# simple name matching
webservers: inventory_hostname.startswith('web')
# using ec2 'tags' (assumes aws inventory)
development: "'devel' in (ec2_tags|list)"
# using other host properties populated in inventory
private_only: not (public_dns_name is defined or ip_address is defined)
# complex group membership
multi_group: (group_names | intersect(['alpha', 'beta', 'omega'])) | length >= 2
keyed_groups:
# this creates a group per distro (distro_CentOS, distro_Debian) and assigns the hosts that have matching values to it,
# using the default separator "_"
- prefix: distro
key: ansible_distribution
# the following examples assume the first inventory is from the `aws_ec2` plugin
# this creates a group per ec2 architecture and assign hosts to the matching ones (arch_x86_64, arch_sparc, etc)
- prefix: arch
key: architecture
# this creates a group per ec2 region like "us_west_1"
- prefix: ""
separator: ""
key: placement.region
# this creates a common parent group for all ec2 availability zones
- key: placement.availability_zone
parent_group: all_ec2_zones
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