test all pod to pod tcp conn on all nodes

README.markdown

Usage

kubectl apply -f https://gist.githubusercontent.com/tg123/16e2fcc4e97222c95c8143858c8a5faf/raw/8e01fb743d4f6563303b9fb163fcf9b63a6aa825/podping.yaml
kubectl get -n podping po

# check if any pod failure

podping.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: podping
  namespace: podping
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: podping
  namespace: podping
data:
  ping.sh: |
    #!/bin/sh
    set -e

    while true; do

      echo "My public ip is:"
      curl -sS @ifconfig.me
      echo ""
      echo ""

      rm -f .good

      kubectl get pods -l app=podping -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}' | while read -r line; do
          ip=$(echo $line | cut -d' ' -f2)
          name=$(echo $line | cut -d' ' -f1)
          echo "Processing $name ($ip)..."
          set +e
          nc -vz -w 1 $ip 80
          if [ ! $? -eq 0 ]; then
            exit 1
          fi
          set -e
          echo ""
          touch .good
      done

      if [ ! -f .good ]; then
        echo "no pods found"
        exit 1
      fi

      sleep 30

    done
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: podping
  namespace: podping
  labels:
    app: podping
spec:
  selector:
    matchLabels:
      app: podping
  template:
    metadata:
      labels:
        app: podping
    spec:
      # add cluster admin role to podping service account
      serviceAccountName: podping
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
      - name: test
        image: portainer/kubectl-shell
        command: ["/bin/sh", "/ping.sh"]
        volumeMounts:
        - name: ping
          mountPath: /ping.sh
          subPath: ping.sh
          readOnly: true
      volumes:
      - name: ping
        configMap:
          name: podping
          items:
          - key: ping.sh
            path: ping.sh
      
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: podping-cluster-admin
subjects:
- kind: ServiceAccount
  name: podping
  namespace: podping
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: podping
  namespace: podping