A tiny utility to run periodically that updates DNS entries for your Tailscale devices in a Cloudflare zone. It's currently being used to keep a globally-distributed K3S cluster running.
It can(not):
- Create A records based on Tailscale hostnames
- Update existing A records
- Support subdomain suffixes
- Support multiple A records for a host
grep -F TODO to see the various complicated things that need to be done.
Per #2, it's possible to have a device hostname that isn't a valid DNS name.
As of 07/18/2022, tailscale2cloudflare has switched to using machine names, which parallels Tailscale's MagicDNS implementation. To retain the old behavior of using hostnames, use the --sync-hostnames flag or set SYNC_HOSTNAMES=1.