How to access ansible_$interface where $interface is a registered value?

[t goto]

Hello, ansible experts. 

I have a question regarding accessing ansible facts.

I have a system with interface named randomly and dynamically.

I successfully retrieved int name and registered it to variable.

Now, I want to know the IP address of it with ansible facts but how can I access it?

I tried to access "ansible_$interface" with following code, 

- name: retrieve interface
   (snip)
  register: interface

- debug: msg="{{ ansible_$interface.stdout['ipv4']['address']}}"

but all I got was  simple characters.

ok: [node4] => {
    "msg": "{{ansible_$linked_bridge.stdout['ipv4']['address']}}"
}

I know it's a very fundamental question, but this variable problems always get in my way :(

[Maciej Delmanowski]

Here you go:

---

- hosts: all

  vars:

    interface: 'br0'

  tasks:

    - name: External bridge IP address

      debug: msg="IP address is {{ hostvars[inventory_hostname]['ansible_' + interface]['ipv4'].address }}"

Cheers,

Maciej

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[t goto]

Hurray! thank you, Mr.Maciej 

I never thought this simple :)

2014年6月26日木曜日 16時59分59秒 UTC+9 Maciej Delmanowski:

[Michael DeHaan]

Ansible has not supported $ substitution in a very very long time.

To generate a variable name programatically, do this through hostvars:

{[ hostvars[inventory_hostname]['ansible_' + linked + '_bridge']['stdout']['ipv4']['address'] }}

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/6d5ccfc6-62a6-4b3c-a3ff-fbbc8b1dbf7b%40googlegroups.com.