Undefined Variable error in ansible for /etc/ansible/hosts varaiables

Question

I have two VMs one as ansible control machine and running playbook to perform action on second vm.

Following are files on ansible control machine

/etc/ansible/ansible.cfg

inventory      = /etc/ansible/hosts

/etc/ansible/hosts

# My nodes
[my-group]
my1-node ansible_user=imran DB_SERVER=10.136.10.49 DB_USER=mydbusr

I tried following two ways to access variables but no success, but if i provide with command line like -e DB_SERVER=10.136.10.49. its working

myplaybook

---
- hosts: all
  tasks:
    - debug: 
        msg:
          - "Database server {{DB_SERVER}}"
          - "Database Username  {{  hostvars['DB_USER'] }}"

Above is producing error

Update: I also run with verbose and its saying so its pointing to correct config, as i read due to vagrant sometime configuration is not pointed correctly.

Using /etc/ansible/ansible.cfg as config file

hostvars['DB_USER'] makes no sense, hostvars contains keys with host names, not variables. For DB_SERVER there is no reason to produce an error with the configuration you posted. — techraf
– techraf, Commented May 29, 2018 at 10:21
@tux while printing they are not showing any value. if i cast to int its saying undefined variable. — ImranRazaKhan
– ImranRazaKhan, Commented May 29, 2018 at 10:40
@techraf any clue to further debug as i tried every possible option. — ImranRazaKhan
– ImranRazaKhan, Commented May 29, 2018 at 10:41
"The task includes an option with an undefined variable. The error was: 'DB_SERVER' is undefined" — ImranRazaKhan
– ImranRazaKhan, Commented May 29, 2018 at 10:48

ilias-sp · Accepted Answer · 2018-05-29 15:10:49Z

0

if you want to use the hostvars magic variables array, you should use the below syntax:

---
- hosts: all
  tasks:
    - debug: 
        msg:
          - "Database server {{DB_SERVER}}"
          - "Database Username  {{  hostvars[inventory_hostname]['DB_USER'] }}"

{{DB_SERVER}} should work, ansible knows how to resolve it to the value you defined in the inventory file.

hope it helps.

answered May 29, 2018 at 15:10

ilias-sp

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