Hi everyone, first of all, I'm new to Ansible and come from Chef
background, so any Chef parallels are welcome. I also use the official ec2
dynamic inventory.
To the problems.
1. So, thanks to the ec2 inventory, I have "ec2_tag_Name",
"ec2_public_dns_name" in hostvars. I'm leveraging a role from
ansible-galaxy that expects a hosts variable to be an array of dicts with
keys 'name', 'address', 'extra' that would look something like this for a
static infrastructure:
hosts:
- name: server1
address: ec2-addr1.amazonaws.com
extra:
- a string
As you might have expected, the hosts come and go, I use an ec2 tag to
group them, say "tag_group_one", on top of that, the extra array is always
the same. So I would like to have my hosts variable to be dynamically
generated on each playbook run, something like this:
hosts: {{ [{"name": host["ec2_tag_Name"], "address": host[
"ec2_public_dns_name"], "extra": ["a string"]} for host in map(hostvars,
groups["tag_group_one"])] }}
Sorry for the long oneliner, but the idea behind it is simple, just reshape
one variable structure into another, so the community role could process it
appropriately. I also know that isn't valid jinja2 which is disappointing
in it's own regard.
What would be the simplest (and the right) solution for this?
2. After that I looked into the community role I'm using, and realized that
this list variable is only used for rendering a single template. This posed
two questions: is there a precedence mechanism for templates? (Chef would
first lookup templates with the same name in the caller cookbook) And, is
there a way to override an argument of a specific task in an included role?
Like replacing the src argument in the template rendering task.
3. This would be a little bug report / feature request: wildcard host
patterns don't work with *groups* function (tried that in a template).
I ended up forking the community role and making the template use hostvars
directly.
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