Libcluster Postgres - Clustering Strategy for Libcluster

@ziinc

Thanks for the great library. I am trying to make it work inside an AWS Elastic Beanstalk environment, and using a RDS PostgreSQL 16 server.

Dockerfile specifications:

ARG ELIXIR_VERSION=1.15.7
ARG OTP_VERSION=26.2.5
ARG DEBIAN_VERSION=bullseye-20240513-slim

One instance reports, as an example:

21:00:14.839 [error] [libcluster:example] Failed to connect to node: myapp@c72329f86177
21:00:19.847 [warning] [libcluster:example] unable to connect to :myapp@c72329f86177

What can be the reason for that?

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