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Dynamic DNS

Accessing a local network remotely with a domain, while having a dynamic IP address.
This method doesn't change DNS records on the domain, it works with IP caching.

Why not using a service like noip.com?
With a free membership, you'll receive a monthly email requiring multiple steps of confirmation to continue using the service. After a while doing this, this process can become annoying.

Requirements

  • Docker on a local machine
  • A domain that points to a webhosting (PHP/MySQL)

Setup webhosting

  1. Setup your domain to point to your webhosting (eg. foo.example.com)
  2. Create a database with following table 
    CREATE TABLE `ips` (
   `ip` VARCHAR(15) NOT NULL,
   `date_time` DATETIME NOT NULL
)
  3. Copy webhosting/index.php to the webroot. Replace database values in $databaseConfig.

Setup local machine

  1. Clone this project
  2. Build the docker container: Run docker build --tag dynamic-dns .
  3. Create a daily cron job for following command (this caches the dynamic IP)
    docker run -e DATABASE_HOST=xx -e DATABASE_USERNAME=xx -e DATABASE_PASSWORD=xx -e DATABASE_NAME=xx dynamic-dns