Rather than register the facts and write to a file, you can use a custom
lookup to query the endpoint based on the instance name. Then you can put
the following in your template file:
{{ lookup('aws_rds_endpoint_port_from_instance_name', (region,
database_instance )) }}
where region is a variable containing the region you use and
database_instance is the name.
I've written some additional lookups, including one to get the endpoint of
an RDS instance based on name
here: https://github.com/jonhadfield/ansible-lookups
I'm also putting together a guide (nearly finished) that includes their use
here: http://lessknown.info.
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