tailscale2cloudflare

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):

• [x] Create A records based on Tailscale hostnames
• [ ] Update existing A records
• [x] Support subdomain suffixes
• [ ] Support multiple A records for a host

grep -F TODO to see the various complicated things that need to be done.

Note on hostnames, machine names

Per https://github.com/mark-ignacio/tailscale2cloudflare/issues/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.