Hello,

You are exactly correct, NGINX is caching the DNS for the private domain.

And indeed the IPs for the private domains will change every time you redeploy the given service.

There is no way to have static IPs for the private network, so you have a few options -

- Use Caddy, Caddy will do a DNS lookup for every request.

- Configure NGINX to re-resolve every 1s -

server {
  listen 8080;
  server_name localhost;

  resolver [fd12::10] ipv6=on valid=1s; // Internal DNS server
  set $proxy_pass_url http://api.railway.internal:8080;

  location / {
    proxy_pass $proxy_pass_url;
  }
}

Thanks for confirming my suspicions brody, Caddy was already on our list to evaluate so so we'll give that a try.

Awsome, let me know how it goes!

We got it setup and Caddy works great, thanks for the suggestion

That's great, I'm happy to hear it!, please let me know if you need anything else.