check_ec2_instance_status

#!/bin/bash

# This script will check specified instance status
# TODO Allow user to specified desired status

# Get script directory
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ] ; do SOURCE="$(readlink "$SOURCE")"; done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

# Load configuration
source ${DIR}/aws.cnf

if [ -z $1 ]
then
  echo "No instance specified"
  # Exit unknown status
  exit 3
fi
ec2_instance=$1

if [[ -z $2 && -z $EC2_REGION ]]
then
  EC2_REGION="eu-west-1"
else
  if [[ -z $EC2_REGION ]]
  then
    EC2_REGION=$2
  fi
fi

state=`${EC2_HOME}/bin/ec2-describe-instance-status -K ${EC2_PRIVATE_KEY} -C ${EC2_CERT} --region $EC2_REGION $ec2_instance | head -1 | awk '{ print $5 }'`

# Nagios status are
# 0 - All is ok
# 1 - Warning
# 2 - Error
# 3 - unknown
return_status=3

case $state in
  0)
    return_message="instance is pending (maybe starting)"
    return_status=3
    ;;
  16)
    return_message="instance is running"
    return_status=0
    ;;
  32)
    return_message="instance is shutting down !!"
    return_status=1
    ;;
  48)
    return_message="instance is terminated !!"
    return_status=2
    ;;
  64)
    return_message="instance is stopping !!"
    return_status=1
    ;;
  80)
    return_message="instance is stopped !!"
    return_status=2
    ;;
  272)
    return_message="instance is in an unknown state ..."
    return_status=3
    ;;
  *)
    return_message="unknown return code"
    return_status=3
    ;;
esac

echo $return_message
exit $return_status