Stop an AWS EC2 instance

ec2-stop-instance.sh

#!/bin/bash -eu
DEFAULT_REGION=ap-northeast-1
INSTANCE_ID=`curl -fsSL http://169.254.169.254/latest/meta-data/instance-id/`
if [ $? = 0 ]; then
  echo "instance-id:["$INSTANCE_ID"]"
else
  echo "An unexpected error occurred when trying to get instance-id."
  exit 1
fi

if ! type jq >/dev/null 2>&1; then
    echo 'jq command is not found. Please install jq.'
    exit 1
fi

INSTANCE_TYPE=`aws ec2 describe-instances --instance-ids $INSTANCE_ID --region $DEFAULT_REGION | jq -r '.Reservations[].Instances[].InstanceType'`
if [ $? = 0 ]; then
  echo "instance-type: [$INSTANCE_TYPE]"
else
  echo "An unexpected error occurred when trying to get instance-type. "
  echo "DEFAULT_REGION: $DEFAULT_REGION"
  exit 1
fi

INSTANCE_STATUS=`aws ec2 describe-instances --instance-ids $INSTANCE_ID --region $DEFAULT_REGION | jq -r '.Reservations[].Instances[].State.Name'`
echo "instance-status:["$INSTANCE_STATUS"]"

if [ -n "$INSTANCE_STATUS" ] && [ $INSTANCE_STATUS = 'running' ] ; then
    echo "ec2-instance stopping..."
    aws ec2 stop-instances --instance-ids $INSTANCE_ID --region $DEFAULT_REGION
else
    echo "Instance $INSTANCE_ID has already stopped."
fi