gistfile1.txt

We set environment variables for the playbook run based on the type of cloud credential, so that the 
modules can pick them up. If the modules are explicitly passed the keys, that will of course override
the cloud credential selection.

For AWS: AWS_ACCESS_KEY and AWS_SECRET_KEY

For Rackspace: RAX_USERNAME and RAX_API_KEY

For Google Compute Engine: GCE_EMAIL, GCE_PROJECT, and GCE_PEM_FILE_PATH

For Azure: AZURE_SUBSCRIPTION_ID and AZURE_CERT_PATH

For VMware: VMWARE_USER, VMWARE_PASSWORD, and VMWARE_HOST.

If you need to access these in your playbook, you can use {{ lookup('env', 'AWS_ACCESS_KEY') }} to
use the variables in other ways. Otherwise, the modules themselves will pick those up properly.