AWS Userdata script to create/update route53 private hosted zone record for ec2 instance.

route53update.sh

# Update route53 record
localip=$(curl -fs http://169.254.169.254/latest/meta-data/local-ipv4)
hostedzoneid=$(aws route53 list-hosted-zones-by-name --dns-name ${Env}.${AWS::Region}.aws.example.com --query 'HostedZones[0].Id' | cut -d / -f 3 | tr -d '"')
file=/tmp/record.json
cat << EOF > $file
{
  "Comment": "Update the A record set",
  "Changes": [
    {
      "Action": "UPSERT",
      "ResourceRecordSet": {
        "Name": "jenkins.${Env}.${AWS::Region}.aws.example.com",
        "Type": "A",
        "TTL": 300,
        "ResourceRecords": [
          {
            "Value": "$localip"
          }
        ]
      }
    }
  ]
}
EOF

aws route53 change-resource-record-sets --hosted-zone-id $hostedzoneid --change-batch file://$file