kubernetes debug-node pod with selector

debug-node.sh

#!/bin/sh -xe

NODE=$(kubectl get nodes -o name |grep $1 | awk -F \/ '{print $2}')

cat << EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
 name: kube-support-$NODE
 namespace: kube-system
 labels:
   app: debug-$NODE
spec:
  terminationGracePeriodSeconds: 1
  containers:
    - name: debian
      image: debian:buster
      command:
      - /usr/bin/nsenter
      args:
      - --mount=/host/proc/1/ns/mnt
      - /bin/bash
      securityContext:
        allowPrivilegeEscalation: true
        capabilities:
          add:
            - ALL
        privileged: true
      stdin: true
      stdinOnce: true
      volumeMounts:
        - name: host
          mountPath: /host
  restartPolicy: Never
  hostIPC: true
  hostNetwork: true
  hostPID: true
  volumes:
    - name: host
      hostPath:
        path: /
        type: Directory
  nodeSelector:
    kubernetes.io/hostname: $NODE
  tolerations:
    - operator: "Exists"
EOF

POD=$(kubectl -n kube-system get po -l app=debug-$NODE  --no-headers -o custom-columns=":metadata.name")

kubectl -n kube-system wait --for condition=ready pod $POD
kubectl exec -ti -n kube-system $POD -- bash
kubectl delete -n kube-system pod $POD