Connecting to redis pod from another pod in the same cluster - kubernetes

Question

In my cluster I have a nodejs application pod and a redis pod, and I am trying to connect to redis from nodejs, but I am getting the following error:
[ioredis] Unhandled error event: Error: getaddrinfo ENOTFOUND redis at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:60:26)
It is worth noting that in my nodejs app I am pointing at redis:6379 and if I change the pointer to localhost:6379, I will get a ECONNREFUSED error.
My redis deployment yaml looks like this:
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis:5.0.4
command:
- redis-server
- '/redis-master/redis.conf'
env:
- name: MASTER
value: 'true'
ports:
- containerPort: 6379
resources:
limits:
cpu: '0.1'
volumeMounts:
- mountPath: /redis-master-data
name: data
- mountPath: /redis-master
name: config
volumes:
- name: data
emptyDir: {}
- name: config
configMap:
name: redis-config
items:
- key: redis-config
path: redis.conf
Mu redis service yaml is the following:
apiVersion: v1
kind: Service
metadata:
name: redis-master
labels:
app: redis
role: master
tier: backend
spec:
ports:
- name: redis
port: 6379
targetPort: 6379
selector:
app: redis
role: master
tier: backend
And the service of my app looks like this:
apiVersion: v1
kind: Service
metadata:
name: bff
annotations:
prometheus.io/scrape: 'true'
prometheus.io/port: '8080'
labels:
app: bff
spec:
ports:
- name: external
port: 80
targetPort: web
protocol: TCP
- name: metrics
port: 8080
targetPort: metrics
protocol: TCP
selector:
app: bff
I have tried following other answers given to similar questions, but they do not seem to work in my case.

Answer 1

The root cause is your service selector definition doesn't match your pods's lables.
Quote from Kubernetes service document:
The controller for the Service selector continuously scans for Pods that match its selector, and then POSTs any updates to an Endpoint object also named “my-service”.
See this link for full document.
In short, by following this Kubernetes official example, you should deploy the deployment "redis-master-deployment.yaml" instead of bare pod.