This works:

- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}::{{ _aws_subnet_name }}::{{_aws_hostname}}] Launch Instance {{ _aws_hostname }}"
  debug:
    msg:
      region: "{{ aws_vpc_map[_aws_vpc_name] }}"
      keypair: "{{ aws_keypair }}"
      group_id: "{{ aws_sg_map[_aws_subnet_name] }}"
      instance_type: "{{ _aws_role_config['type'] }}"
      image: "{{ aws_images[_aws_vpc_name] }}"
      instance_tags: "{{ {'Name':_aws_hostname } |combine(aws_tags) }}"
      exact_count: 1
      count_tag:
        Name: "{{ _aws_hostname }}"
      wait: true
      vpc_subnet_id: "{{ _aws_subnets_map[_aws_vpc_name + '-' + _aws_subnet_name] }}"

If I do something stupid, for instance, change the image line to

      image: "{{ aws_images['public-1'] }}"

which I know doesn't exist, I get the following:

TASK [aws-instance : [ibgw::smc-west::public-1::smc-ibgw-6001a] Launch Instance smc-ibgw-6001a] ************************
fatal: [localhost]: FAILED! => {}

MSG:

The task includes an option with an undefined variable. The error was: 'dict object' has no attribute u'public-1'

The error appears to have been in '/mnt/c/Users/chrome/Development/ansible-smc/roles/aws-instance/tasks/each_instance.yml': line 27, column 3, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:


- name: "[{{ _aws_role_config.role }}::{{ _aws_vpc_name }}::{{ _aws_subnet_name }}::{{_aws_hostname}}] Launch Instance {{ _aws_hostname }}"
  ^ here
We could be wrong, but this one looks like it might be an issue with
missing quotes.  Always quote template expression brackets when they
start a value. For instance:

    with_items:
      - {{ foo }}

Should be written as:

    with_items:
      - "{{ foo }}"

exception type: <class 'ansible.errors.AnsibleUndefinedVariable'>
exception: 'dict object' has no attribute u'public-1'




super unhelpful.