Get a shell to a Kubernetes node with root capabilities

kubeshell

#!/bin/sh

# https://alexei-led.github.io/post/k8s_node_shell/

if [ -z "${1}" ]; then
echo "ERROR No kubernetes node supplied.
Script needs a node name as first argument!

Find node names with:
$ kubectl get node
"
exit 1
fi

set -x

node=${1}
nodeName=$(kubectl get node ${node} -o template --template='{{index .metadata.labels "kubernetes.io/hostname"}}')
nodeSelector='"nodeSelector": { "kubernetes.io/hostname": "'${nodeName:?}'" },'
podName=${USER}-nsenter-${node}

kubectl run ${podName:?} --restart=Never -it --rm --image overriden --overrides '
{
  "spec": {
    "hostPID": true,
    "hostNetwork": true,
    '"${nodeSelector?}"'
    "tolerations": [{
        "operator": "Exists"
    }],
    "containers": [
      {
        "name": "nsenter",
        "image": "alexeiled/nsenter:2.34",
        "command": [
          "/nsenter", "--all", "--target=1", "--", "su", "-"
        ],
        "stdin": true,
        "tty": true,
        "securityContext": {
          "privileged": true
        }
      }
    ]
  }
}' --attach "$@"