run.sh

#!/bin/bash

cmd="$1"
nodes=$(k3s kubectl get nodes -o json | jq -r '.items[].metadata.labels["kubernetes.io/hostname"]' | sort)
while read node; do
  if [[ $node -eq "$HOSTNAME" ]]; then
    continue
  fi

  echo "> $node:";
  nodeSelector='"nodeSelector": { "kubernetes.io/hostname": "'$node'" },'
  podName=$USER-nsenter-$node
  k3s kubectl delete pod $podName 2>/dev/null
  k3s kubectl run --quiet $podName --restart=Never -it --rm --image overriden --overrides '
  {
    "spec": {
      "hostPID": true,
      "hostNetwork": true,
      '"${nodeSelector?}"'
      "tolerations": [{
          "operator": "Exists"
      }],
      "containers": [
        {
          "name": "nsenter",
          "image": "alexeiled/nsenter:2.34",
          "command": [
            "/nsenter", "--all", "--target=1", "--", "bash", "-c", "'${cmd}'"
          ],
          "securityContext": {
            "privileged": true
          }
        }
      ]
    }
  }'
  echo
done <<< $nodes