group_vars are applied to individual hosts and is not available globally
without a host context. To use a variable for hosts it must be global and
provided before parsing the play. Such as providing it via --extra-vars on
the command line.
On Friday, December 11, 2015, Alexandr Kurilin <a...@frontrowed.com> wrote:
> Hey folks,
>
> Ansible 1.9.2 here. I've been recently working on moving us over from
> static inventories to using the ec2 script. One constraint I have is that I
> separate different environments within the same AWS account by the
> Environment tag. In this case I'm working on Environment=dev, which in my
> file tree has its own folder (see tree at the bottom). The problem I'm
> having is that I can't figure out how to set {{ env }} in my *- hosts:*
> from my all.yml file in group_vars. It looks like group_vars as NOT read at
> the time of the playbook yml file templating, but only afterwards. As an
> example, assuming this all.yml:
>
> ---
>
> env: dev
>
> and this foo.yml:
>
> ---
>
> - hosts: "{{ 'tag_Role_utilities:&tag_Environment_' + env }}"
> tasks:
> - debug: var=env
>
> this playbook will not work:
>
> ansible-playbook -i inventories/dev/ec2.py foo.yml
>
> PLAY [{{ 'tag_Role_utilities:&tag_Environment_' + env }}]
> *********************
> skipping: no hosts matched
>
> but if I pass the env variable as --extra-vars, then it will:
>
> ansible-playbook -i inventories/dev/ec2.py foo.yml --extra-vars="env=dev"
>
> PLAY [tag_Role_utilities:&tag_Environment_dev]
> ********************************
>
> GATHERING FACTS
> ***************************************************************
> ok: [172.31.57.124]
>
> TASK: [debug var=env]
> *********************************************************
> ok: [172.31.57.124] => {
> "var": {
> "env": "dev"
> }
> }
>
> PLAY RECAP
> ********************************************************************
> 172.31.57.124 : ok=2 changed=0 unreachable=0 failed=0
>
>
> Note that here the value of "env" in the debug module is actually
> correctly populated from the all.yml group_vars file. e.g. if I rename that
> var name in both the debug module and all.yml to something like
> inventory_env, it will get the value correctly.
>
> Is this by design? Is there no way for me to template the tags in *-
> host:* without using an --extra-vars? Any way I can use group_vars for
> playbook templating? It would save me the need to write my own wrapper
> script around ansible that would set --extra-vars for me for each separate
> environment I have.
>
> My inventories/dev tree structure is as follows:
>
> dev
> ├── ec2.ini
> ├── ec2.py
> ├── group_vars
> │ ├── all
> │ │ ├── all.yml
> │ │ └── secrets.yml
> │ ├── apps
> │ └── utils
> └── hosts
>
>
> Thank you.
>
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--
Matt Martz
@sivel
sivel.net
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