Your general approach is pretty much correct in your last example:
- hosts: "{{ hosts | default('bid-'+ dc) }}"
Although jinja2 recommends using a `~` instead of `+` for string
concatenation, although both will work.
However, the real problem is with your variable. You have created the `dc`
variable in your inventory, which means that it is scoped to the hosts
within that group. Because you are using the `dc` variable in your `hosts`
declaration, no hosts have been targeted, and additionally, the `dc`
variable is per host, not global.
As such, you cannot use the `dc` variable in a hosts declaration due to
variable scoping, and the `dc` variable not being defined at that point.
The only real place to define a variable that can be used in the `hosts`
declaration is via the command line via -e/--extra-vars
On Thu, Jan 5, 2017 at 8:10 AM, Nicolas G <[email protected]> wrote:
> I have the bellow Ansible inventory :
>
> [web:children]
> web-eu-west
> web-us-east
> [eu:vars]
> dc=eu-west
> [eu:children]
> web-eu-west
> [us:vars]
> dc=us-east
> [us:children]
> web-us-east
>
>
> The bellow is working fine in my playbook :
> -- hosts: "{{ hosts | default('web') }}"
>
>
> Unfortunately we have a case now where we need to combine the *dc *variable
> in the default filter , I'm trying the bellow two combinations with errors :
>
> - hosts: "{{ hosts | default('web-'dc) }}"
>
>> ERROR! template error while templating string: expected token ',', got
>> 'dc'. String: {{ hosts | default('web-'dc) }}
>
>
> - hosts: "{{ hosts | default('bid-'+ dc) }}"
>
>> ERROR! the field 'hosts' has an invalid value, which appears to include a
>> variable that is undefined. The error was: 'dc' is undefined
>
>
> What is the right way to concatenate a value and a var using the default
> filter ?
>
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--
Matt Martz
@sivel
sivel.net
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