How to connect application in Tomcat to Postgres in Kubernetes?

Question

PostgreSQL

Deployed deployments in an MCS - Kubernetes cluster with Postgresql and Tomcat with a server application, configured services and ingress. The server responds to requests, but does not return data from the database, it seems that the connection to the database was incorrectly configured in kubernetes. Before that, everything was on the Ubuntu server and worked without problems. Can you tell me what could be the problem?

Answer 1

In the wrong connection parameters, a crookedly configured network, a non-working application, a non-working database, equipment failure, etc.
All answers are in the logs.