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domain-redirect

A very simple golang http server to redirect all subdomains it receives of a domain to a different domain

My reason for writing it: I have muscle memory that I refuse to get rid of for my existing internal LAN names. However, I am migrating my Kubernetes cluster pods to be exposed via Tailscale rather than directly on the LAN.

So I'm just going to have this service do a temporary redirect for my old domain to my *.ts.net domain until Tailscale yields and allows custom DNS records or I find a new solution after upgrading my Kubernetes cluster.

Usage

Set the following environment variables:

  • LISTEN_ADDR - optional; an ip:port string of what interface to listen on. By default, all interfaces on port 8080. Passed directly to http.ListenAndServe, so only takes one address (as of Go <1.26)
  • REDIRECT_DOMAIN - required; we cut off the last two domain labels and replace with it. Ex, setting example.com will redirect foo.bar.example.local to foo.bar.example.com