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.
Split DNS on your LAN?
Only records permitted to be access on your LAN are responded by a local DNS server. While public DNS still available for your public facing services.
Your wildcard cert will work for both situations as the browser only cares the sni matches the Url in your address bar.
I have that setup, my domain is hosted by OVh and they have an API that you can use to get a wildcard certificate with.
At home I run pihole and that has some sites in as local IPs, but if you look the same site up from OVH you would get an internet IP
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.
This is specifically info about LetsEncrypt, not general SSL.
Yes my answer is for use with Let’s Encrypt.
OP is asking for cases where you don’t want to allow the service (or reverse proxy) to be accessible via the web.
As I understand it, OP just wants to hide (=remove) the subdomains from the public URLs.
They do not. See my other reply about DNS verification.
Your response clearly states publicly accessible DNS. A CA does not require anything public for local SSL and can work in conjunction with whatever service they want for that which is public.
Fair, I don’t know why I read OPs post as asking for let’s encrypt certs. Internal CA is indeed an option.
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.
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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.
