Postgres on Kubernetes password authentication failed - postgresql

Question

I used this tutorial: https://severalnines.com/blog/using-kubernetes-deploy-postgresql
With my configuration on Kubernetes which is based off the official Docker Image I keep getting:
psql -h <publicworkernodeip> -U postgres -p <mynodeport> postgres
Password for user postgres: example
psql: FATAL: password authentication failed for user "postgres"
DETAIL: Role "postgres" does not exist.
Connection matched pg_hba.conf line 95: "host all all all md5"
yamls:
apiVersion: v1
kind: ConfigMap
metadata:
name: postgres-config
labels:
app: postgres
data:
POSTGRES_DB: postgres
POSTGRES_USER: postgres
POSTGRES_PASSWORD: example
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: postgres
spec:
replicas: 1
template:
metadata:
labels:
app: postgres
spec:
containers:
- name: postgres
image: postgres:11
imagePullPolicy: Always
ports:
- containerPort: 5432
envFrom:
- configMapRef:
name: postgres-config
volumeMounts:
- mountPath: /var/lib/postgresql/data
name: postgres
volumes:
- name: postgres
persistentVolumeClaim:
claimName: postgres-pv-claim
apiVersion: v1
kind: Service
metadata:
name: postgres
labels:
app: postgres
spec:
type: NodePort
ports:
- port: 5432
selector:
app: postgres
kind: PersistentVolume
apiVersion: v1
metadata:
name: postgres-pv-volume
labels:
type: local
app: postgres
spec:
storageClassName: manual
capacity:
storage: 12Gi
accessModes:
- ReadWriteMany
hostPath:
path: "/mnt/data"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
name: postgres-pv-claim
labels:
app: postgres
spec:
storageClassName: manual
accessModes:
- ReadWriteMany
resources:
requests:
storage: 12Gi

Answer 1

try to login using the below command
psql -h $(hostname -i) -U postgres
kubectl exec -it postgres-566fbfb87c-rcbvd sh
# env
POSTGRES_PASSWORD=example
POSTGRES_USER=postgres
POSTGRES_DB=postgres
# psql -h $(hostname -i) -U postgres
Password for user postgres:
psql (11.2 (Debian 11.2-1.pgdg90+1))
Type "help" for help.
postgres=# \c postgres
You are now connected to database "postgres" as user "postgres".
postgres=#