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ansible-inventory –list host groups command line – Nginx

I would like to obtain the list of host group names (only) from ansible-inventory, however I’m having to use grep to trim down the list based on known group name patterns – e.g.

  • Clean output but messy command line and need to know group name pattern ahead of time:

ansible-inventory -i inventory/production --list --yaml | grep webserver_.*:$

  • Clean command line and don’t need to know group name pattern, but messy output:

ansible-playbook my-playbook.yml -i inventory/production --list-hosts

Is there a clean way to extract just the group names from inventory?

Example hosts.yml:

# NGINX
webserver_1:
  hosts:
    ws1.public.example.com

webserver_2:
  hosts:
    ws2.public.example.com

webserver_2:
  hosts:
    ws2.public.example.com

# EC2 back-ends
backend_ec2_1:
  hosts:
    be1.internal.example.com

backend_ec2_2:
  hosts:
    be2.internal.example.com

backend_ec2_3:
  hosts:
    be3.internal.example.com
[Ansible v2.9.7]
Tags:

2

Answers


  1. 0

    You could use the jq command to parse the json output from ansible-inventory --list, like this:

    $ ansible-inventory -i hosts --list | jq .all.children
[
  "backend_ec2_1",
  "backend_ec2_2",
  "backend_ec2_3",
  "ungrouped",
  "webserver_1",
  "webserver_2"
]

    Or if you want just bare names:

    $ ansible-inventory -i hosts --list | jq -r '.all.children[]'
backend_ec2_1
backend_ec2_2
backend_ec2_3
ungrouped
webserver_1
webserver_2
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  2. 0

    This command lists the groups defined in the inventory

    ansible localhost -m debug -a 'var=groups.keys()' -i inventory/production/
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