How store full host name as variable in ansible? - ansible

Question

I need to use one out of two hosts as a variable. I do have inventory_hostname_short of both but I need a full host as a variable. Currently, for testing I am using a hardcoded value. My playbook will run on both hosts at a same time so How I can identify and store as a variable.
host_1_full = 123.abc.de.com
host_2_full = 345.abc.de.com
above both are hosts and I do have
---
- name: Ansible Script
hosts: all
vars:
host1_short : '123'
host2_short : '345'
tasks:
- name: set host
set_fact:
host1_full: "{{inventory_hostname}}"
when: inventory_hostname_short == host1_short
- name: print info
debug:
msg: "host - {{host1_full}}"
- name: block1
block:
- name:running PS1 file
win_shell: "script.ps1"
register: host1_output
when: inventory_hostname_short == host1_short
- name: block2
block:
- name: set host
set_fact:
IN_PARA: "{{ hostvars[host1_full]['host1_output']['stdout']}}"
- name:running PS1 file
win_shell: "main.ps1 -paramater {{ IN_PARA }}"
register: output
when: inventory_hostname_short == host2_short
SO to access any file from different host required full hostname. How can I get that full host name

Answer 1

Given the following inventories/test_inventory.yml
---
all:
hosts:
123.abc.de.com:
345.abc.de.com:
ansible will provide the needed result in inventory_hostname automagically as demonstrated by the following test.yml playbook
---
- name: print long and short inventory name
hosts: all
gather_facts: false
tasks:
- name: print info
debug:
msg: "Host full name is {{ inventory_hostname }}. Short name is {{ inventory_hostname_short }}"
which gives:
$ ansible-playbook -i inventories/test_inventory.yml test.yml
PLAY [print long and short inventory name] *********************************************************************************************************************************************************************************************
TASK [print info] **********************************************************************************************************************************************************************************************************************
ok: [345.abc.de.com] => {
"msg": "Host full name is 345.abc.de.com. Short name is 345"
}
ok: [123.abc.de.com] => {
"msg": "Host full name is 123.abc.de.com. Short name is 123"
}
PLAY RECAP *****************************************************************************************************************************************************************************************************************************
123.abc.de.com : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
345.abc.de.com : ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0

Answer 2

As already suggested, the ansible_hostname and ansible_fqdn are automatic facts about hosts in your inventory. However, your requirement is a little unique. So we might have to apply a unique method to accomplish this. How about something like this?
Consider example inventory as below:
---
all:
hosts:
192.168.1.101: # 123.abc.de.com
192.168.1.102: # 345.abc.de.com
We can have a play like this:
- hosts: all
vars:
host1_short: 123
host2_short: 345
tasks:
- command: "hostname -f"
register: result
- block:
- set_fact:
host1_full: "{{ result.stdout }}"
- debug:
msg: "Host1 fullname: {{ host1_full }}"
when: host1_short in result.stdout