Basically, i have a Deployment that creates 3 containers which scale automatically: PHP-FPM, NGINX and the container that contains the application, all set up with secrets, services and ingress. The application also share the project between PHP-FPM and NGINX, so it's all set up.

Since i want to explore more with K8s, i decided to create a pod with Redis that also mounts a persistent disk (but that's not important). I have also created a service for redis and all works perfectly fine if i SSH into the Redis container and run redis-cli.

The fun part is that the project can't connect to the pod on which Redis is on. I understand that the containers between pods share the same "local" network and they can be accessed using localhost.

How do i connect my project to the redis server that is running in other pod, that scales independently? What's wrong with the Redis service?

My Redis service is this:

apiVersion: v1
kind: Service
metadata:
  name: redis-service
spec:
  ports:
  - port: 6379
    targetPort: 6379
  selector:
    app: redis

My Redis pod is powered by a deployment configuration file (i don't necessarily scale it, but i'll look forward into it):

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  labels:
    app: redis
spec:
  selector:
    matchLabels:
      app: redis
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: redis
    spec:
      volumes:
        - name: redis-persistent-volume
          persistentVolumeClaim:
            claimName: redis-pvc
      containers:
        - image: redis:4.0.11
          command: ['redis-server']
          name: redis
          imagePullPolicy: Always
          resources:
            limits:
              cpu: 250m
              memory: 512Mi
            requests:
              cpu: 250m
              memory: 512Mi
          ports:
            - containerPort: 6379
              name: redis
          volumeMounts:
            - name: redis-persistent-volume
              mountPath: /data

Also, when i tap into the kubectl get service, the Redis server has a Cluster IP:

NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP        21h
nginx-service   NodePort    10.100.111.16   <none>        80:30312/TCP   21h
redis-service   ClusterIP   10.99.80.141    <none>        6379/TCP       6s