oci-dyndns

Trivial Oracle Cloud DNS updater via HTTP API

This is a trivial dynamic DNS updater for Oracle Cloud: the idea is to deploy this to OKE and have a simple HTTPS API endpoint to register my home IP address as a DNS record in the DNS zone served by Oracle DNS.

Why?

• I want to be able to connect to my home server, and my home IP address changes frequently.
• Existing dynamic DNS services introduce an additional point of failure, I'd rather not add complexity where it's not needed.
• Oracle DNS does not support standard dynamic DNS protocols (RFC 2136, etc.).
• Calling curl in DHCP client hook or just as a cronjob is incredibly simple.
• I wanted to write something somewhat useful to get my feet wet with Go.

How?

Either build the executable manually, or use the provided container image. Two command-line parameters are supported:

Usage of ./oci-dyndns:
  -config string
    	Configuration file name (default "config.json")
  -listen string
    	Address and port to listen to (default ":8080")

The configuration file is expected to contain the following:

{
  "zone": "DNS zone to update",
  "host": "Host name to update, FQDN",
  "token": "HTTP authentication token -- has to be passed as token=value in the HTTP request",
  "oci": {
    "tenancy"              : "OCI user credentials that can update DNS records",
    "user"                 : "",
    "region"               : "",
    "fingerprint"          : "",
    "privateKey"           : ""
  }
}

API

Only one endpoint is available: POST /update. The only expected parameter is token. Example:

  curl -X POST 'https://my-domain/update?token=secretValue'