Send an SMS in case the ec2 instance is idle

idle_instance_notification.sh

#!/usr/bin/env bash

MIN_LOAD=1
ADMIN_NUMBERS=( "+49NUMBER1" "+49NUMBER2" )

if ! who | grep -q *; then
  echo "users logged in"
  exit 0
fi

LOAD=`uptime | awk '{print $NF}'`
WORKING=`echo "$LOAD>$MIN_LOAD" | bc `

if [[ $WORKING == 1 ]]; then
  echo "server is doing work"
  exit 0
fi

TWILIO_SID="YOUR TWILIO SID"
TWILIO_TOKEN="YOUR TWILIO TOKEN"
IP=`wget -qO- http://instance-data/latest/meta-data/public-ipv4`
MESSAGE="Hi, I'm idleing and no one is logged in. Cheers\n$IP"

for NUMBER in "${ADMIN_NUMBERS[@]}"
do
  RES=`curl -sfX POST "https://api.twilio.com/2010-04-01/Accounts/$TWILIO_SID/Messages.json" \
       --data-urlencode "To=$NUMBER" \
       --data-urlencode 'From=TWILIO' \
       --data-urlencode "Body=$MESSAGE" \
       -u $TWILIO_SID:$TWILIO_TOKEN`
  if [ $? -gt 0 ]; then
    echo "Failed to send SMS: $RES"
    exit 1
  fi
done