Assume you are working with this inventory (hosts) file:
[bootstrap]
opihi.example.com ansible_host=192.168.30.254 ansible_user=you ansible_password='{{ vault_opihi_you_user_password }}' ansible_python_interpreter=/usr/bin/python3
then you can get the IP address with the expression {{ hostvars[groups['bootstrap'][0]].ansible_host }}.
Here is an example playbook:
---
- hosts: localhost
tasks:
- debug: msg={{ hostvars[groups['bootstrap'][0]].ansible_host }}
Which will output:
$#> ansible-playbook -i inventories/prod/ debug.yml
PLAY [localhost] ********************************************************************************************************************************
TASK [Gathering Facts] **************************************************************************************************************************
ok: [localhost]
TASK [debug] ************************************************************************************************************************************
ok: [localhost] => {}
MSG:
192.168.30.254
PLAY RECAP **************************************************************************************************************************************
localhost : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
Enjoy.
