Re: [ansible-project] concatenate a value with another variable in default filter
Got it Matt , that makes sense.
Thanks .
On Thursday, January 5, 2017 at 10:46:00 AM UTC-5, Matt Martz wrote:
>
> 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 > 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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>>
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>
>
>
> --
> Matt Martz
> @sivel
> sivel.net
>
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Re: [ansible-project] concatenate a value with another variable in default filter
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 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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> To view this discussion on the web visit https://groups.google.com/d/
> msgid/ansible-project/1a96a93f-11a3-485a-be73-58beeb046c6f%40googlegroups.
> com
>
> .
> For more options, visit https://groups.google.com/d/optout.
>
--
Matt Martz
@sivel
sivel.net
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Re: [ansible-project] concatenate a value with another variable in default filter
On 05.01.17 15:10 Nicolas G wrote:
> - hosts: "{{ hosts | default('web-'dc) }}"
Try this:
- hosts: "{{ hosts | default([ [ 'web-', dc ] | join ] ) }}"
or
- hosts: "{{ hosts | default([ 'web-', dc ] | join ) }}"
Not sure if you need two sets of square brackets.
Johannes
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