cap_docker_packet_in_k8s.sh

  function e() {
      set -eu
      ns=${2-"default"}
      pod=`kubectl -n $ns describe pod $1 | grep -A10 "^Containers:" | grep -Eo 'docker://.*$' | head -n 1 | sed 's/docker:\/\/\(.*\)$/\1/'`
      pid=`docker inspect -f {{.State.Pid}} $pod`
      echo "entering pod netns for $ns/$1"
      cmd="nsenter -n --target $pid"
      echo $cmd
      $cmd
  }