use Mix.Config config :ex_aws, debug_requests: true, access_key_id: [{:system, "AWS_ACCESS_KEY_ID"}, :instance_role], secret_access_key: [{:system, "AWS_SECRET_ACCESS_KEY"}, :instance_role], region: "us-east-1" config :ex_aws, :dynamodb, scheme: "http://", host: "localhost", port: 8000, region: "us-east-1" config :ex_aws, :rds, scheme: "https://", host: {"$region", "rds.$region.amazonaws.com"}, region: "us-east-1", port: 80