Quick check domain address and ec2 public ip.

route53-ec2-ip-match.sh

#!/bin/bash
# ============================================================
#  Author: Chu-Siang Lai / chusiang (at) drx.tw
#  Filename: route53-ec2-ip-match.sh
#  Modified: 2016-11-14 15:31
#  Description: Quick check domain address and ec2 public ip.
#
#   - It's need install the `jq` package.
#
#  Reference: 
#
#   1. describe-instances — AWS CLI 1.11.14 Command Reference
#    - http://docs.aws.amazon.com/cli/latest/reference/ec2/describe-instances.html
#   2. list-resource-record-sets — AWS CLI 1.11.14 Command Reference
#    - http://docs.aws.amazon.com/cli/latest/reference/route53/list-resource-record-sets.html
#   3. 玩具烏托邦: json 轉檔萬用瑞士刀 jq
#    - http://newtoypia.blogspot.tw/2015/03/json-jq.html
#
# =========================================================== 

## Route 53
#
HOSTED_ZONE_ID="<Your Hosted Zone ID>"

# example: note.drx.tw.
DOMAIN_NAME="<Your Domain Name>"

# Get DOMAIN_ADDRESS with awscli.
DOMAIN_ADDRESS=$(aws route53 list-resource-record-sets --hosted-zone-id $HOSTED_ZONE_ID --query "ResourceRecordSets[?Name == '$DOMAIN_NAME']" | jq "map( .ResourceRecords[].Value)")

## EC2
#
INSTANCE_NAME="<Your Instance Name>"

# Get EC2_PUBLIC_IP with awscli.
EC2_PUBLIC_IP=$(aws ec2 describe-instances --filters "Name=tag:Name,Values=$INSTANCE_NAME" --query "Reservations[].Instances[].PublicIpAddress" | jq .)

## Main
#
if [ "$EC2_PUBLIC_IP" == "$DOMAIN_ADDRESS" ]; then
  # filter the char of '"'.
  IP_ADDRESS=`echo $EC2_PUBLIC_IP | awk -F '\"' '{ print $2 }'`

  echo "[ok] The 'DNS Record' and 'EC2 Public IP Address' has be matched."
  echo
  echo "- Domain name: $DOMAIN_NAME"
  echo "- IP Address: $IP_ADDRESS"
else
  echo "[warn] It's not matched."
  echo
  echo "EC2_PUBLIC_IP = $EC2_PUBLIC_IP"
  echo "DOMAIN_ADDRESS = $DOMAIN_ADDRESS"
fi