Set up a temporary tunnel for a port to a container

tunnel_container.sh

function tunnel_container () {
  local container=$1
  local port=${2:-3306}
  local network=
  if [[ -z $container || $container == -h || $container == --help ]]; then
    echo 'USE: tunnel_container <container> [port]' >&2
    return
  elif ! network=$(docker container inspect -f '{{range $k, $v := .NetworkSettings.Networks}}{{$k}}{{break}}{{end}}' "$container") > /dev/null 2>&1; then
    echo "Container $container does not exist." >&2
    return
  elif [[ -z $network ]]; then
    echo "Could not find network for $container." >&2
    return
  fi
  echo "Connecting you to $container port $port on the $network network. Press ctrl-c when done..."
  docker run --rm --network="$network" -p "$port:$port" alpine/socat "TCP-LISTEN:$port,fork" "TCP:$container:$port"
}