ERROR: 'str' object has no attribute 'labels' about hostname-as-target-for-elastic-load-balancer HOT 1 OPEN

I believe this happens when the resolver search domain is unset / empty, and the resolver domain is empty as well (set to empty string in the lambda_utils file).

I was able to replicate this error by running the dns_lookup function locally. When running the function as-is, it worked as it should. When I added myResolver.search = '' in the function, it gave the same error as @nbjwo1 got. I'm guessing the search domain is picked up from my OS when running locally, and that it's not set when running in a Lambda.

As a workaround you can make sure the TARGET_FQDN contains a trailing period, so my.example.com. (which works since using a search domain is no longer necessary) in favor of my.example.com (which the dnspython library (correctly) does not percieve as an absolute hostname).

from hostname-as-target-for-elastic-load-balancer.