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CNAME Record Setter

This script scans for the DNS resolution of a specific A the returned IPs to sync with another A record on a google cloud DNS managed domain.

Configuration

The script is available as a docker file on docker hub.

  • CNAME_RECORD_SETTER_SET_RECORD - The record which should be set from the ip addresses of the observed record.
  • CNAME_RECORD_SETTER_OBSERVED_RECORD - The record which is observed to be set.
  • CNAME_RECORD_SETTER_PROJECT_ID - The project id on google cloud where the provided zone is in which holds the record to be updated.

Why?

We ran into the issue with a webflow site which should be hosted under the root domain. Whilst it is possible to set a CNAME on a root domain, this would make it not possible to resolv any sub domains, because the DNS standard states, a CNAME record to be the end of a DNS resolution. Thus, no sub domains would be checked.

Some DNS provides supply unofficial ANAME records with a similar functionality, providing a transparent proxy of the DNS resolution. This script implements this functionality by utilizing the Google Cloud DNS API.

License

This small script is licensed with the MIT license.

How to use

There is an example configuration file to run the application on Kubernetes. The docker image is also publicly available on docker hub. The stable tag refers to the latest build in the master branch. Otherwise all iamges are published with teh branch and the git commit id if a pin to a specific version is required.