Variables between tasksand errors between Debian and Mac OS

[Adele Dazim]

Hi All,

I'm using a playbook to create an instance. Essentially, I've modified the code snippet on example 4 here -> http://docs.ansible.com/guide_aws.html

From the command_line, I pass in a variable "instance_name", which I use to set the tags for the EC2 instance and the hostname for the instance I just created.

The below code snippet works fine on Mac (Ansible 1.7.2), but fails on Debian 8.0 with the same version of Ansible 1.7.2. 

What am I doing wrong? Or is this something with the code?

- hosts: localhost

  connection: local

  gather_facts: False

  vars:

      instance_name: "somename"
  -tasks:

--snipped--
--snipped--

# Connect to the node and gather facts, including the instance-id. These facts
# are added to inventory hostvars for the duration of the playbook's execution
# Typical "provisioning" tasks would go in this playbook.

- hosts: ec2hosts
  gather_facts: True
  user: admin
  sudo: True

  tasks:
    # fetch instance data from the metadata servers in ec2
    - ec2_facts:

    # show all known facts for this host
    - debug: var=hostvars[inventory_hostname]

    # just show the instance-id
    - debug: msg="{{ hostvars[inventory_hostname]['ansible_ec2_instance_id'] }}"
 
    - name: set hostname to {{ instance_name }}
      hostname:
        name: "{{ instance_name }}"

The error I get on debian is:

TASK: [set hostname to {{ instance_name }}] ***********************************


fatal: [54.xx.xx.xx] => One or more undefined variables: 'instance_name' is undefined

FATAL: all hosts have already failed -- aborting

PLAY RECAP ********************************************************************

On the Mac (Yosemite), this part goes without any incident:

TASK: [set hostname to somename] *************************************************

changed: [54.xx.xx.xx]

[Michael DeHaan]

It looks like your variable is defined to the localhost action and then is not defined when talking to your ec2_hosts.

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