Serverless DDNS Updater

A Dynamic DNS updater service using Serverless framework.

Installation

Clone the repository

git clone https://github.com/Ennexa/serverless-ddns-updater

Install project dependencies

npm install

Copy the included file config.json.sample to config.json and add your dynamic host details. Change the default username and password. (The default username / password is admin and secret)

Password should be hashed with bcrypt. You can use an online service like https://bcrypt-generator.com/ for generating the hash.

Finally, activate the service

./node_modules/.bin/sls create_domain -s production
./node_modules/.bin/sls deploy -s production

It is highly recommended to secure your APIGateway endpoint using free SSL certificate from ACM.

Updating IP Address

The dynamic ip address can be updated by sending a GET request to the APIGateway endpoint

curl -s https://<username>:<password><endpoint_domain>/update?hostname=<dynamic_hostname>

You may also use the ddns-update client included with this project. The client can be configured using

• Command line arguments

  ddns-update -h <endpoint_domain> -u <username> -p <password> -s set <dynamic_hostname>
  

  See ./ddns-update --help for all available options

• Environment variables

  The client can also be configured by defining the following environment variables

  DDNS_USERNAME=<username>      # Username from config.json
  DDNS_PASSWORD=<pssword>       # Password from config.json
  DDNS_SERVER=<endpoint_domain> # DDNS server endpoint hostname from config.json
  DDNS_SECURE=1                 # Required only If you have enabled SSL in ApiGateway (highly recommended).
  

• Configuration file

  You man also create a persistent configuration by saving the above configuration variables to any of the following locations

  • ~/.ddns-update-rc
  • /usr/local/etc/ddns-update
  • /etc/ddns-update