Unable to connect to postgres with Postgrex :nxdomain

Questions / Help
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1

Hi, I have a fairly complicated setup here so bear with me.
Environment for context.
ELIXIR_VERSION=1.15.6
OTP_VERSION=26.0.2
DEBIAN_VERSION=bullseye-20230612
ARCH=arm64
I’m getting a nxdomain error when attempting to connect to a postgres database.

02:52:14.727 [error] Postgrex.Protocol (#PID<0.2229.0>) failed to connect: ** (DBConnection.ConnectionError) tcp connect (db-cluster-rw.default.svc.cluster.local:5432): non-existing domain - :nxdomain

The postgres database is up and working and I’m able to connect to it via psql with a separate container.

From within the same container that the phoenix app is running both ping and :inet.gethostname are able to resolve the dns.

ping -4 db-cluster-rw.default.svc.cluster.local

Any tips on how I should proceed? If I’m missing any information that would be helpful, let me know. Thanks!

2

Here is also /etc/resolv.conf

search default.svc.cluster.local svc.cluster.local cluster.local us-west-2.compute.internal
nameserver 10.43.0.10
options ndots:5
3

I ended up resolving the issue. Apparently I had some left over configuration from a fly.io deployment that was causing conflicts with dns (ipv6 perhaps) when building the release.