Simple Kubernetes manifest to check connectivity between two pods running on different nodes

client-server-test-pods.yaml

apiVersion: v1
kind: Pod
metadata:
  name: test-server
  labels:
    app: test-server
spec:
  terminationGracePeriodSeconds: 1
  containers:
  - name: netshoot
    image: nicolaka/netshoot
    command: ["/bin/sh"]
    args: ["-c", "while true; do nc -lv 8080 ; done"]
  tolerations:
  - key: "cattle.io/os"
    operator: "Equal"
    value: "linux"
    effect: "NoSchedule"
  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values: ["test-client"]
        topologyKey: "kubernetes.io/hostname"
---
apiVersion: v1
kind: Service
metadata:
  name: test-server
  labels:
    app: test-server
spec:
  ports:
  - port: 8080
    protocol: TCP
  selector:
    app: test-server
---
apiVersion: v1
kind: Pod
metadata:
  name: test-client
  labels:
    app: client
spec:
  terminationGracePeriodSeconds: 1
  containers:
  - name: netshoot
    image: nicolaka/netshoot
    command: ["/bin/sh"]
    args: ["-c", "while true; do nc -vz -w 5 test-server 8080; sleep 2;done"]
  tolerations:
  - key: "cattle.io/os"
    operator: "Equal"
    value: "linux"
    effect: "NoSchedule"
  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
          - key: app
            operator: In
            values: ["test-server"]
        topologyKey: "kubernetes.io/hostname"