README.md

Change the number of REPLICAS to make it easier or harder.

demo

$ bash game.sh
I have launched 2 Pods in a Replica Set, are you quicker eliminating
them than Kubernetes recreating them? Let's see!

To terminate a pod you need to write its ID as quick as you can. GO!

...

Try to terminate: 1521l
> a
Wrong ID!

Try to terminate: 1521l
> 1521l
Cool, you did it!

Try to terminate: 246rt
> 246rt
Cool, you did it!

You have win, congratulations!

TODO

• Wait for a proper cleanup.
• Wait for at least having one container running instead just sleeping.

game.sh

#!/bin/bash

NAME=thegame
REPLICAS=5

trap ctrl_c INT

function ctrl_c() {
  end
}

function start() {
  kubectl create namespace $NAME &> /dev/null
  kubectl run $NAME --replicas=$REPLICAS --image=alpine --namespace=$NAME --command -- sleep 1h &> /dev/null
  
  cat <<EOF
I have launched $REPLICAS Pods in a Replica Set, are you quicker eliminating
them than Kubernetes recreating them? Let's see!

To terminate a pod you need to write its ID as quick as you can. GO!

...

EOF

  sleep 5s # TODO: instead sleep wait for a pod to start running
}

function end() {
  kubectl delete namespace $NAME &> /dev/null
  exit 0
}

function print_id_message {
  ID=$(kubectl get pods --namespace=$NAME|\
    grep "Running"|\
    head -n1|\
    awk '{ print $1 }'|\
    awk -F- '{ print $NF }')
  
  if [ "$ID" == "" ]; then
    echo "You have win, congratulations!"
    end
  fi

  echo -n "Try to terminate: "
  echo $ID
}

start

while [ 1 ]; do
  print_id_message
  read -p "> " id

  kubectl delete --namespace=$NAME $(kubectl get pods --namespace=$NAME -o=name|egrep -e "-$id$") &> /dev/null
  if [[ "$?" == 0 ]]; then
    echo "Cool, you did it!"
  else
    echo "Wrong ID!"
  fi

  echo ""
done

end