For instance how can I use my *.domain.com SSL certs and NPM to route containers to a subdomain without exposing them? The main domain is exposed.
If you have wildcard certs, you just install them everywhere your services are running.
As far as redirects go, you just 302 redirect from one host to another.
Unless you’re asking about resolving hosts on your internal network and public ones differently, which is a lot more complicated than you probably want to deal with if you’re already kind of lost. Just setup a VPN to your internal network and be done with it. Otherwise setup a local DNS resolver to bridge your public DNS and local requests.
You can use the DNS verification method. Either using nsupdate with bind or what ever protocol your DNS provider and favorite ACME (certbot, acme, lego, etc) utility supports. As long as your DNS server is publically reachable that will work, even if the subdomain itself doesn’t exist publically.
I don’t really understand what you’re getting at. The answer to OPs question is to use letsencrypt like everyone else.
They literally didn’t mention LE at all.
SSL is not LetsEncrypt, if you didn’t know.
This is what I do as well. I have a public DNS record for my internal reverse proxy IP (no need to expose my public IP and associate it with my domain). I let NPM reach out to the DNS provider to complete verification challenge using an account token, NPM can then get a valid cert from Let’s Encrypt and nothing is exposed. All inbound traffic on 80/443 remains blocked as normal.
OP is asking for cases where you don’t want to allow the service (or reverse proxy) to be accessible via the web.
How we’ve done it recently:
- Put domain on cloudflare or another registrar that supports an API. Generate a token with the right privs.
- Use certbot with the cloudflare plugin, and that token, and generate whatever certs you need within that domain using the DNS01 method.
No need to have port 80 open to the world, no need for a reverse proxy, no need for NAT rules to point it to the right machine, no need to even have DNS set up for the hostname. All of that BS is removed.
The token proves your authentication and LetsEncrypt will generate the certs.
