I'm having troubles establishing a SSL connection between a web service and a remotely hosted Postgres database. With the same cert and key files being used for the web service, I can connect to the database with tools such as pgAdmin and DataGrip. These files were downloaded from Postgres instance in the Google Cloud Console.

Issue:

At the time of Spring Boot service start up, the following error occurs:

org.postgresql.util.PSQLException: Could not read SSL key file /tls/tls.key

Where I look at the Postgres server logs, the error is recorded as

LOG: could not accept SSL connection: UNEXPECTED_RECORD

Setup:

Spring Boot service running on Minikube (local) and GKE connecting to a Google Cloud SQL Postgres instance.

Actions Taken:

I have downloaded the client cert & key. I created a K8s TLS Secret using the downloaded client cert & key. I also have made sure the files can be read from the volume mount by running the following command on the k8s deployment config:

command: ["bin/sh", "-c", "cat /tls/tls.key"]

Here is the datasource url which is fed in via an environment variable (DATASOURCE).

"jdbc:postgresql://[Database-Address]:5432/[database]?ssl=true&sslmode=require&sslcert=/tls/tls.crt&sslkey=/tls/tls.key"

Here is the k8s deployment yaml, any idea where i'm going wrong?

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: {{ template "service.name" . }}
  labels:
    release: {{ template "release.name" . }}
    chart: {{ template "chart.name" . }}
    chart-version: {{ template "chart.version" . }}
  release: {{ template "service.fullname" . }}
spec: 
  replicas: {{ $.Values.image.replicaCount }}
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1 
  template:
    metadata:
      labels:
        app: {{ template "service.name" . }}
        release: {{ template "release.name" . }}
        env: {{ $.Values.environment }}
    spec:
      imagePullSecrets:
        - name: {{ $.Values.image.pullSecretsName }}
      containers:
        - name: {{ template "service.name" . }}
          image: {{ $.Values.image.repo }}:{{ $.Values.image.tag }}
          # command: ["bin/sh", "-c", "cat /tls/tls.key"]
          imagePullPolicy: {{ $.Values.image.pullPolicy }}
          volumeMounts:
            - name: tls-cert
              mountPath: "/tls"
              readOnly: true
          ports:
            - containerPort: 80
          env:
            - name: DATASOURCE_URL
              valueFrom:
                secretKeyRef:
                  name: service
                  key: DATASOURCE_URL
            - name: DATASOURCE_USER
              valueFrom:
                secretKeyRef:
                  name: service
                  key: DATASOURCE_USER
            - name: DATASOURCE_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: service
                  key: DATASOURCE_PASSWORD
      volumes:
        - name: tls-cert
          projected:
            sources:
              - secret:
                  name: postgres-tls
                  items:
                    - key: tls.crt
                      path: tls.crt
                    - key: tls.key
                      path: tls.key