update_route53_on_ec2_launch

update_R53_with_A_RS.sh

#!/bin/bash
# save this file as /root/update_route53.sh and run "bash /root/update_route53.sh" in the UserData
# Author: pahudnet@gmail.com 2016/08/10

publicIp=$(curl -s http://169.254.169.254/latest/meta-data/public-ipv4)
hostId='XXXXXXXXX'

cat > /tmp/update.json <<EOF
{
  "Changes": [
    {
      "Action": "UPSERT",
      "ResourceRecordSet": {
        "Name": "myhost.example.com",
        "Type": "A",
        "TTL": 60,
        "ResourceRecords": [
          {
            "Value": "${publicIp}"
          }        
        ]
      }
    }
  ]
}
EOF

aws route53 change-resource-record-sets --hosted-zone-id $hostId --change-batch file:////tmp/update.json

make sure the EC2 run as appropriate role with the following policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Stmt1470806437000",
            "Effect": "Allow",
            "Action": [
                "route53:ChangeResourceRecordSets"
            ],
            "Resource": [
                "arn:aws:route53:::hostedzone/<YOUR_ZONE_ID>"
            ]
        }
    ]
}