add ddns service

ddns/ddns.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# Get public IP address (there are many ways to do it, I picked this way)
+PUBLIC_IP=$(curl -4 ifconfig.me)
+# Update *.{{ fqdn }} and {{ fqdn }}
+cat /etc/ddns/record_template.json \
+  | jq '.Changes[0].ResourceRecordSet.ResourceRecords[0].Value = "'$PUBLIC_IP'"' \
+  | jq '.Changes[1].ResourceRecordSet.ResourceRecords[0].Value = "'$PUBLIC_IP'"' \
+   > /etc/ddns/record.json
+# aws cli to update a record
+aws route53 change-resource-record-sets --hosted-zone-id {{ hosted_zone_id }} --change-batch file:///etc/ddns/record.json