Access group members of a variable group name

[Roshani]

Hi everyone,

I have many groups in my inventory like this: 

[website-front-lb]
192.168.1.2
192.168.1.3

[proj1-subproj1-lb]

192.168.1.22

192.168.1.33

etc.

Now I want to access members of a specific group in my playbook. Both to show them or use them in conditionals. 

I know that the nested {{}} notation is not possible. Also, {{}} can not be used in conditionals like when. I have tried to use "lookup" plugin without success. 

Thank you for your help.

A pseudo playbook:

---
- hosts: all

  # inventory:
  # [website-front-lb]
  # 192.168.1.2
  # 192.168.1.3

  vars:
          proj: 'website'
          subproj: 'front'
  tasks:
          - name: "Show group members"
            debug: msg=??  # Something like: {{groups[{{proj}}-{{subproj}}-lb]}}

          - name: "Conditional"
            do something
            when: inventory_hostname in {{groups[{{proj}}-{{subproj}}-lb]}}

[Dick Visser]

Try the below suggestions

On Wed, 26 Jan 2022 at 15:29, Roshani <m.ro...@gmail.com> wrote:

> vars:
> proj: 'website'
> subproj: 'front'
> tasks:
> - name: "Show group members"
> debug: msg=?? # Something like: {{groups[{{proj}}-{{subproj}}-lb]}}

debug: var=groups[proj]~'-'~subproj~'-lb']

> - name: "Conditional"
> do something
> when: inventory_hostname in {{groups[{{proj}}-{{subproj}}-lb]}}

when: "inventory_hostname in groups[proj ~ '-' ~ subproj ~ '-lb' ]"


--
Dick Visser
Trust & Identity Service Operations Manager
GÉANT

[Roshani]

Thank you so much dick.

It worked flawlessly. 

There's a just a typo:

the extra closing bracket should be removed after proj:

  debug: var=groups[proj]~'-'~subproj~'-lb']  ------> debug: var=groups[proj~'-'~subproj~'-lb']