how to use dynamic calling of a variable which is present in vars file

[Gopi Krishna]

Hi All,

My variable file:

     

     VISEBS_SYSTEM: password

My yaml.file:

 

I'll be passing a argument to my playbook as -e "src=VISEBS", in my playbook i am trying to get dynamically the VISEBS_SYSTEM value. any suggestions 

   - include_vars: variable_file

   - debug: 

        msg: "{{ '{{src}}_SYSTEM' }}"

as {{src}} will be replaced by VISEBS, i'm thinking that it will transform to {{VISEBS_SYSTEM}} which will finally print "password", but its not happening what is the

exact way to achieve this.

[Kai Stian Olstad]

On 24.01.2018 12:09, Gopi Krishna wrote:
> - debug:
> msg: "{{ '{{src}}_SYSTEM' }}"
>
> as {{src}} will be replaced by VISEBS, i'm thinking that it will
> transform
> to {{VISEBS_SYSTEM}} which will finally print "password", but its not
> happening what is the
> exact way to achieve this.

You can't stack curly brackets, so the solution is

msg: "{{ vars[src ~ '_SYSTEM' }}"

~ (tilde) is used for concatenate strings in Jinja

--
Kai Stian Olstad

[Gopi Krishna]

Hi Kai,

Thanks, it worked, but where can i find these kind of descriptions in ansible. as the ansible doc's didn't have these kind of docs i guess.

[Kai Stian Olstad]

On 25.01.2018 06:44, Gopi Krishna wrote:
> Thanks, it worked, but where can i find these kind of descriptions in
> ansible. as the ansible doc's didn't have these kind of docs i guess.

The FAQ covers some of the pitfalls
http://docs.ansible.com/ansible/latest/faq.html#when-should-i-use-also-how-to-interpolate-variables-or-dynamic-variable-names

Since this is Jinja maybe it's documented there also.


--
Kai Stian Olstad

[Gopi Krishna]

sure, thanks kai