Pods in differents Nodes can't talk each other - Kubernetes - mongodb

Question

Context:
I am building an application and now I am on the infrastructure step.
The application is built with Java and persistence layer is MongoDB.
Problem:
If the application is running in same Node as persistence Layer are, everything goes ok, but on different nodes the application cannot communicate with MongoDB.
There is a print of Kubernetes Dashboard:
As you can see, two pods of application (gateway) are running in same node as Mongo, but other two don't. These two are not finding MongoDb.
Here is the mongo-db.yaml:
apiVersion: v1
kind: PersistentVolume
metadata:
name: mongo-data
spec:
accessModes:
- ReadWriteOnce
capacity:
storage: 1Gi
hostPath:
path: /home/vitor/seguranca/mongo
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: pvc
spec:
storageClassName: ""
accessModes:
- ReadWriteOnce
volumeName: mongo-data
resources:
requests:
storage: 1Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: mongo
name: mongo
spec:
replicas: 1
selector:
matchLabels:
app: mongo
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: mongo
name: mongo-service
spec:
volumes:
- name: "deployment-storage"
persistentVolumeClaim:
claimName: "pvc"
containers:
- image: mongo
name: mongo
ports:
- containerPort: 27017
volumeMounts:
- name: "deployment-storage"
mountPath: "/data/db"
status: {}
---
apiVersion: v1
kind: Service
metadata:
labels:
app: mongo
name: mongo-service
spec:
ports:
- port: 27017
targetPort: 27017
selector:
app: mongo
clusterIP: None
and here the application.yaml:
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: gateway
name: gateway
spec:
replicas: 4
selector:
matchLabels:
app: gateway
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: gateway
spec:
containers:
- image: vitornilson1998/native-micro
name: native-micro
env:
- name: MONGO_CONNECTION_STRING
value: mongodb://mongo-service:27017 #HERE IS THE POINT THAT THE APPLICATION USES TO ACCESS MONGODB
- name: MONGO_DB
value: gateway
resources: {}
ports:
- containerPort: 8080
status: {}
---
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: gateway-service
name: gateway-service
spec:
ports:
- name: 8080-8080
port: 8080
protocol: TCP
targetPort: 8080
selector:
app: gateway
type: NodePort
status:
loadBalancer: {}
I can't see what is stopping application to reach MongoDB.
Should I do what?

Answer 1

I was using calico as CNI.
I removed calico and let kube-proxy take care of everything.
Now everything is working fine.