Public bug reported:

A new AMI launched with the current Ubuntu 18.04 AMI is unable to
resolve local Amazon DNS addresses.

This is on a newly started Ubuntu 18.04 AMI

ubuntu@ip-172-20-14-123:~$ nslookup primary.test.local
Server:        127.0.0.53
Address:    127.0.0.53#53

** server can't find primary.whitehaven.local: SERVFAIL

I changed the symlink for resolv.conf from

resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

to 
resolv.conf -> /run/systemd/resolve/resolv.conf

and I can now resolve internal DNS

ubuntu@ip-172-20-14-123:/etc$ sudo ln -sfn /run/systemd/resolve/resolv.conf 
resolv.conf
ubuntu@ip-172-20-14-123:/etc$ nslookup primary.test.local
Server:        172.20.0.2
Address:    172.20.0.2#53

Non-authoritative answer:
Name:    primary.test.local
Address: ***.***.***.***

Seems like for the base AMI this should work by default

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ec2-ami-tools (not installed)
ProcVersionSignature: User Name 4.15.0-1044.46-aws 4.15.18
Uname: Linux 4.15.0-1044-aws x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
Date: Wed Aug 14 14:58:14 2019
Ec2AMI: ami-07d0cf3af28718ef8
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1b
Ec2InstanceType: t2.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: ec2-ami-tools
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ec2-ami-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic ec2-images

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https://bugs.launchpad.net/bugs/1840155

Title:
  new EC2 is unable to resolve local Amazon DNS

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