Apache Cassandra: Unable to gossip with any seeds on Kubernetes/ Ubuntu Server - kubernetes

Question

I am trying to install datastax cassandra (DSE) on Kubernetes on Ubuntu. But getting the below error in the pod logs.
Apache Cassandra: Unable to gossip with any seeds
Replicas: 2
Heap memory given: 8GB
Ram Given: 16GB
Server: AWS EC2
Disk: Local provision
Note: Minikube is not required for this process
Here's my cluster.yaml file
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: cassandra
namespace: cassandra
labels:
app: cassandra
spec:
serviceName: cassandra
replicas: 2
selector:
matchLabels:
app: cassandra
template:
metadata:
labels:
app: cassandra
spec:
terminationGracePeriodSeconds: 1800
containers:
- name: cassandra
image: datastax/dse-server:6.7.7
imagePullPolicy: Always
ports:
- containerPort: 7000
name: intra-node
- containerPort: 7001
name: tls-intra-node
- containerPort: 7199
name: jmx
- containerPort: 9042
name: cql
resources:
limits:
cpu: "8000m"
memory: 16Gi
requests:
cpu: "8000m"
memory: 16Gi
securityContext:
capabilities:
add:
- IPC_LOCK
lifecycle:
preStop:
exec:
command:
- /bin/sh
- -c
- nodetool drain
env:
- name: MAX_HEAP_SIZE
value: 8G
- name: HEAP_NEWSIZE
value: 8G
- name: SEEDS
value: "10.32.0.2,10.32.0.5,10.32.0.6"
- name: CLUSTER_NAME
value: "Demo Cluster"
- name: DC
value: "dc1"
- name: RACK
value: "rack1"
- name: NUM_TOKENS
value: "128"
- name: DS_LICENSE
value: "accept"
- name: POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
readinessProbe:
exec:
command:
- /bin/bash
- -c
- "cp /ready_probe.sh /tmp/ready_probe.sh && chmod 777 /tmp/ready_probe.sh && /tmp/ready_probe.sh"
initialDelaySeconds: 20
timeoutSeconds: 5
volumeMounts:
- name: cassandra-data
mountPath: /var/lib/cassandra
subPath: cassandra
- name: cassandra-data
mountPath: /var/lib/spark
subPath: spark
- name: cassandra-data
mountPath: /var/lib/dsefs
subPath: dsefs
- name: cassandra-data
mountPath: /var/log/cassandra
subPath: log-cassandra
- name: cassandra-data
mountPath: /var/log/spark
subPath: log-spark
- name: cassandra-data
mountPath: /config
subPath: config
- name: cassandra-data
mountPath: /var/lib/opscenter
subPath: opscenter
- name: cassandra-data
mountPath: /var/lib/datastax-studio
subPath: datastax-studio
- name: script
mountPath: /ready_probe.sh
subPath: ready.sh
volumes:
- name: script
configMap:
name: script
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- ubuntuserver
volumeClaimTemplates:
- metadata:
name: cassandra-data
spec:
accessModes: [ "ReadWriteOnce" ]
storageClassName: local-storage
resources:
requests:
storage: 128Gi
Can anyone please help me with that?