Ansible Inventory: Static and Dynamic

[web]
web1 ansible_host=192.168.1.10
web2 ansible_host=192.168.1.11

[db]
db1 ansible_host=192.168.1.20

[web:vars]
ansible_user=ubuntu
http_port=80

[db:vars]
ansible_user=postgres

all:
  children:
    web:
      hosts:
        web1:
          ansible_host: 192.168.1.10
        web2:
          ansible_host: 192.168.1.11
      vars:
        ansible_user: ubuntu
        http_port: 80
    db:
      hosts:
        db1:
          ansible_host: 192.168.1.20
      vars:
        ansible_user: postgres

[web_prod]
web-prod-1 ansible_host=10.0.1.10
web-prod-2 ansible_host=10.0.1.11

[web_staging]
web-stg-1 ansible_host=10.0.2.10

[db_prod]
db-prod-1 ansible_host=10.0.1.20

[prod:children]
web_prod
db_prod

[staging:children]
web_staging

[web:children]
web_prod
web_staging

inventory/
├── hosts.yml
├── group_vars/
│   ├── all.yml          # Applies to everything
│   ├── web.yml          # Web server vars
│   └── prod.yml         # Production vars
└── host_vars/
    └── web-prod-1.yml   # Specific host vars

ntp_server: time.google.com
dns_servers:
  - 8.8.8.8
  - 8.8.4.4

monitoring_enabled: true
log_level: warn

plugin: amazon.aws.aws_ec2
regions:
  - eu-west-1
filters:
  tag:Environment:
    - production
keyed_groups:
  - key: tags.Role
    prefix: role
  - key: placement.availability_zone
    prefix: az
compose:
  ansible_host: private_ip_address

# Test it
ansible-inventory -i aws_ec2.yml --list

# Use it
ansible-playbook -i aws_ec2.yml site.yml

plugin: azure.azcollection.azure_rm
auth_source: auto
include_vm_resource_groups:
  - my-resource-group
keyed_groups:
  - key: tags.environment | default('unknown')
    prefix: env

# List all hosts
ansible-inventory -i inventory/ --list

# Graph view
ansible-inventory -i inventory/ --graph

# Test connectivity
ansible all -i inventory/ -m ping