On 06/24/14 17:48, Claus Strommer wrote:
> Hi there,
>
> I have a play with a role that creates a load balancer template. I've
> successfully tested it in my dev environment, using
>
>
> {% for host in groups['dev-web'] %}
> server {{ host }} {{ host }}:80
> {% endfor %}
>
>
> the 'dev-web' group is defined in my inventory, as well as
> 'stage-web', 'prod-web', etc. What I'd like to do is change this
> template so that it can be used in any environment. I am already
> passing a parameter upon calling the play, --extra-vars
> "deploy_env=dev". In the play itself I can use this variable to
> determine on which balancer the template gets applied, by using
> something like this:
>
>
> - hosts: [ '{{ deploy_env }}-bal' ]
> serial: 1
> vars_files:
> - /var/lib/ansible/vars/{{ deploy_env }}.yml
> roles:
> - role: "haproxy-webbal"
>
>
> However, if I try something similar in the template, e.g.
>
>
> {% for host in groups['{{ deploy_env }}-web'] %}
> server {{ host }} {{ host }}:80
> {% endfor %}
>
> I get this error:
>
>
> fatal: [stage-webbal-06.aws.primal.com
> <http://stage-webbal-06.aws.primal.com>] => {'msg': "One or more
> undefined variables: 'dict object' has no attribute '{{ deploy_env
> }}-varnish'", 'failed': True}
>
>
> It seems that {{ deploy_env }} is not being expanded, and it's being
> taken as a literal. Is this because it's within the {% %} section?
> If so, then what is the correct syntax for doing this? Alternatively,
> is there a cleaner way to approach this?
>
Access your var inside the "{% %}" block without a "{{ }}" surrounding
and use string concatenation like this:
{% for host in groups[deploy_env + '-web'] %}
server {{ host }} {{ host }}:80
{% endfor %}
>
>
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