update the IP of an A record using the EC2 metadata information.

gistfile1.txt

public_ipv4_address_of_server=$(curl http://169.254.169.254/latest/meta-data/public-ipv4 -s) && { cat > ./update_clickbuysmileArecord.json <<EOF
{
  "Comment": "update click buy smile domain with new A record IP",
  "Changes": [
    {
      "Action": "UPSERT",
      "ResourceRecordSet": {
        "Name": "your_domain_name.com",
        "Type": "A",
        "TTL": 60,
        "ResourceRecords": [
          {
            "Value": "$public_ipv4_address_of_server"
          }
        ]
      }
    }
  ]
}
EOF
} && aws route53 change-resource-record-sets --hosted-zone-id your_domain_name.com_host's_id --change-batch file://update_clickbuysmileArecord.json