autokuttle

#!/usr/bin/env bash
# Inspired by: https://github.com/kayrus/kuttle
# Usage:
#
#   sshuttle -v -r 'none' -e /path/to/this_script 172.20.0.0/16
#

set -e

VERSION=0.1
if [ "$1" == "--version" ] ; then
  echo "Version: $VERSION"
  exit
fi

NAME=$(basename $0)
DEPLOYMENT="deployment/$NAME"

# skip until python command
# https://github.com/sshuttle/sshuttle/blob/45f8cce2f892749a0971f0d1e299dcdc32f88afe/sshuttle/ssh.py#L141
while [ $# -gt 0 ] ; do
  arg=$1
  shift
  if [ "$arg" == "--" ] ; then
    break
  fi
done

if [ $# -lt 1 ] ; then
  printf "Missing command to exec in pod!\n"
  exit 1
fi

if [ -z "$(kubectl get -n default $DEPLOYMENT -o name --ignore-not-found)" ] ; then
  kubectl create -n default --save-config -f - >/dev/null <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: $NAME
    creator: $(whoami)
  name: $NAME
spec:
  replicas: 1
  selector:
    matchLabels:
      app: $NAME
  template:
    metadata:
      labels:
        app: $NAME
    spec:
      containers:
      - image: python:3-alpine
        name: python
        command: ["sh"]
        args: ["-c", "exec tail -f /dev/null"]
EOF
fi

kubectl wait po -l app=$NAME -n default --for condition=Ready --timeout 30s >/dev/null

eval exec kubectl exec --namespace=default -i $DEPLOYMENT -- "$@"

Make sure it's executable and then run:

sshuttle -v -r 'none' -e /path/to/autokuttle 192.168.0.0/16

Where 192.168.0.0/16 is the network you want to tunnel through sshuttle.