Exec into a node with kubectl

kubectl-exec-node.sh

#!/usr/bin/env bash

NODE=kind-control-plane
IMG="docker.io/library/alpine"
POD="nsenter-$(tr -dc a-z0-9 < /dev/urandom | head -c 6)"
OVERRIDE="{\"spec\":{\"nodeName\":\"$NODE\",\"hostPID\":true,\"containers\":[{\"securityContext\":{\"privileged\":true},\"image\":\"${IMG}\",\"name\":\"nsenter\",\"stdin\":true,\"stdinOnce\":true,\"tty\":true,\"command\":[\"nsenter\",\"--target\",\"1\",\"--mount\",\"--uts\",\"--ipc\",\"--net\",\"--pid\",\"--\",\"bash\",\"-l\"]}]}}"

kubectl run --rm \
    --image "${IMG}" \
    --overrides="${OVERRIDE}" \
    --generator=run-pod/v1 \
    -ti "${POD}" \
    -n default

Copy it and execute.

You can download it as follows:

curl -fsSL https://git.io/kubectl-exec-node

TODO LIST

• flags and minimal validation
  • node name
  • namespace
• check node exists
• check kubectl exists