Can't ping postgres pod from another pod in kubernetes - kubernetes

Question

I created one busy pod to test db connection by following yaml
pod.yaml
kind: Pod
apiVersion: v1
metadata:
name: marks-dummy-pod
spec:
containers:
- name: marks-dummy-pod
image: djtijare/ubuntuping:v1
command: ["/bin/bash", "-ec", "while :; do echo '.'; sleep 5 ; done"]
restartPolicy: Never
Dockerfile used :-
FROM ubuntu
RUN apt-get update && apt-get install -y iputils-ping
CMD bash
I create service as
postgresservice.yaml
kind: Service
apiVersion: v1
metadata:
name: postgressvc
spec:
type: ClusterIP
ports:
- port: 5432
targetPort: 5432
Endpoint for created service as
kind: Endpoints
apiVersion: v1
metadata:
name: postgressvc
subsets:
- addresses:
- ip: 172.31.6.149
ports:
- port: 5432
Then i ran ping 172.31.6.149 inside pod (kubectl exec -it mark-dummy-pod bash) but not working.(ping localhost is working)
output of kubectl get pods,svc,ep -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/marks-dummy-pod 1/1 Running 0 43m 192.168.1.63 ip-172-31-11-87 <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/postgressvc ClusterIP 10.107.58.81 <none> 5432/TCP 33m <none>
NAME ENDPOINTS AGE
endpoints/postgressvc 172.31.6.149:5432 32m
Output for answer by P Ekambaram
kubectl get pods,svc,ep -o wide gives
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/postgres-855696996d-w6h6c 1/1 Running 0 44s 192.168.1.66 ip-172-31-11-87 <none> <none>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/postgres NodePort 10.110.203.204 <none> 5432:31076/TCP 44s app=postgres
NAME ENDPOINTS AGE
endpoints/postgres 192.168.1.66:5432 44s

Answer 1

So problem was in my DNS pod in namespace=kube-system
I just create new kubernetes setup and make sure that DNS is working
For new setup refer to my answer of another question
How to start kubelet service??

Answer 2

postgres pod is missing?
did you create endpoint object or was it auto generated?
share the pod definition YAML
you shouldnt be creating endpoint. it is wrong. follow the below deployment for postgres.
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-data
volumes:
- name: postgres-data
emptyDir:
---
apiVersion: v1
kind: Service
metadata:
name: postgres
labels:
app: postgres
spec:
type: NodePort
ports:
- port: 5432
selector:
app: postgres
undeploy postgres service and endpoint and deploy the above YAML.
it should work
why NODE ip is prefixed with ip-

Answer 3

you should create deployment for your database and then make a service that target this deployment and then ping using this service why ping with ip ?