1-output.txt

$ kubessh node.info/external.ipaddress 192.168.2.2
If you don't see a command prompt, try pressing enter.
[root@k8s-worker-ad1-0 /]# exit

$ kubectl get pods
NAME                     READY     STATUS    RESTARTS   AGE
kubessh-tjfontai-15628   1/1       Running   0          7s

2-kubessh.sh

function kubessh() {
    ###
    ### Usage: kubessh <label> <selector>
    ### Example: kubessh node.info/external.ipaddress 192.168.2.2
    ###
    ### You'll need to have permission to run privileged containers, as well as
    ### grab the host's PID namespsace
    ###
    ### You will have entered the twighlight zone, where portions of your env
    ### will be from a different namespace, so certain things will fail in
    ### interestingly subtle ways. For instance, yum will attempt to ioctl your
    ### pts, you can work around this with either redirecting input or output
    ### depending on the failure.

    LABEL=$1
    VALUE=$2

    POD_NAME="kubessh-${USER}-$$"

    # Apparently, certain fields are not PATCHd when overriding, so you must
    # specify the stdin and tty pieces, otherwise they'll get lost
    OVERRIDE=$(cat <<-END
    {
      "spec": {
        "containers": [{
          "image": "busybox",
          "name":"${POD_NAME}",
          "command": ["nsenter", "-t", "1", "-m", "-u", "-i", "-n", "--", "bash"],
          "stdin":true,
          "stdinOnce":true,
          "tty":true,
          "securityContext":{"privileged":true}}],
        "hostPID": true,
        "nodeSelector": { "${LABEL}": "${VALUE}" }
      }
    }
END
    )
    kubectl run ${POD_NAME} -i -t --rm --image=busybox --restart=Never  --overrides="$OVERRIDE"
}