Make sure you have the following installed before starting:

• nodejs
• npm
• serverless

git clone https://github.com/jmb12686/serverless-ddns
cd serverless-ddns
npm install

Modify the following configuration parameters in config.json:

apiDomainName - URL to host on API Gateway. Must have matching AWS Certificate Manager and own domain in Route53

ddnsHostName - Domain name, owned in Route 53, that you want to keep updated with a dynamic IP.

notificationTopicARN - TopicARN, in SNS, that you wish to receive notifications on. Notifications are sent upon a successful DDNS update or failed attempt.

First, create the custom domain in API Gateway and route53 (corresponds to the apiDomainName config variable):

serverless create_domain

Now, deploy the serverless stack:

serverless deploy

NOTE: Use --stage prod to deploy to prod

Usage instructions for interacting with the ddns API

Fetch current caller IP, similar to 'what's my ip':

$ curl https://apiDomainName

POST 'homeIp' JSON to API endpoint with AWS IAM Signature. User api user is created upon stack deployment. Use aws-authenticated-curl-utility to properly sign authenticated requests

$ post_it.sh -credentials <aws_access_key>:<aws_secret_key> -url <api_url> -region us-east-1 -service execute-api -body "'{\"homeIp\":\"$ip\"}'"

1. Eliminate topicARN requirement, and instead send to arbitrary email and/or SMS