Cloudflare Developers•2mo ago

Nginx Streams

I'm pretty new to Nginx and managing subdomains etc. and this doesn't exactly have something to do with Cloudflare but I'm not sure where else to ask. This is my config for trying to setup minecraft servers:

stream {
  map $ssl_preread_server_name $target {
        alpha   192.168.178.2:27000; # I wasn't sure if I should reference the subdomain or the full name `alpha.example.com` but either way this didn't work.
        beta    192.168.178.2:27001;
        gamma   192.168.178.2:27002;
        delta   192.168.178.2:27003;
        epsilon 192.168.178.2:27004;

        default 192.168.178.2:27000;
  }

    server {
        listen 25565;
        listen [::]:25565;

        ssl_preread on;
        proxy_connect_timeout 1s;
        proxy_timeout 3;

        proxy_pass $target;
  }
}

stream {
  map $ssl_preread_server_name $target {
        alpha   192.168.178.2:27000; # I wasn't sure if I should reference the subdomain or the full name `alpha.example.com` but either way this didn't work.
        beta    192.168.178.2:27001;
        gamma   192.168.178.2:27002;
        delta   192.168.178.2:27003;
        epsilon 192.168.178.2:27004;

        default 192.168.178.2:27000;
  }

    server {
        listen 25565;
        listen [::]:25565;

        ssl_preread on;
        proxy_connect_timeout 1s;
        proxy_timeout 3;

        proxy_pass $target;
  }
}

My idea is to have n amound of CNAMEs and SRV records that all listen at 25565 (minecrafts default port) and forward to their respective subdomain on my server. that server then listens on said port 25565 and should forward it to the specific minecraft server depending on the subdomain. e.g.: alpha.example.com > 192.168.178.2:27000 beta.example.com > 192.168.178.2:27001 ... other.example.com > 192.168.178.2:27000 (default should either be the first one or no connection at all) currently everything coming in at 25565 resolves to the default being 192.168.178.2:27000 which isn't great. my motivation being that I had a setup before where the client would have to specify different ports if it wasn't the default one like beta.example.com:25566 which I'd like to avoid. Anyone have an idea how i could implement this/ where i could find more information on this topic? Thanks in advance

29 Replies

マオOP•2mo ago

On another note, I was also thinking of reusing the CNAME records by creating new SRV records but for different ports, so that i can reuse names like alpha.example.com but listening on some port 12345 which I would then resolve similarly to minecraft to some other game server like ARK, but first id like to get it to work for minecraft. Is this possible though?

Laudian•2mo ago

If you create the correct SRV record, clients don't need to enter the port. I don't see how what you've explained above would work.

マオOP•2mo ago

How would a correct SRV record look like?

Laudian•2mo ago

It would have the correct port

マオOP•2mo ago

currently I have something like _minecraft._tcp.alpha.example.com On port 25565 targeting alpha.example.com

Laudian•2mo ago

The SRV record tells minecraft what port the server on alpha is using

マオOP•2mo ago

The port I enter in the SRV record is the one the server is using and not what the client will use to connect?

Laudian•2mo ago

both are the same?

マオOP•2mo ago

Hmm no because I have for example alpha running on 27000 beta on 27001 etc

Laudian•2mo ago

Yes?

マオOP•2mo ago

But the user will always be incoming on 25565 So how do I link them correctly

Laudian•2mo ago

no why will the user connect to 25565?

マオOP•2mo ago

because they just input the address without specifying the port, so they use the standard port of 25565

Laudian•2mo ago

マオOP•2mo ago

At least that’s what I’m hoping to achieve

Laudian•2mo ago

thath's why you have an srv record to tell minecraft which port to use

マオOP•2mo ago

Hmm ok so I change the SRV to port 27000 for example Then the user goes to alpha.example.com, without specifying the port, and my server is listening at 27000 Would this work?

Laudian•2mo ago

yes

マオOP•2mo ago

Interesting, didn’t know SRVs worked like that Btw I called it _minecraft._tcp.alpha because I saw others do it, is that just a naming convention/ preference or is the name important?

Laudian•2mo ago

for sub.example.com, minecraft checks for an srv on _minecraft._tcp.sub.example.com

マオOP•2mo ago

Just to make sure, there’s no way I can route on my reverse proxy instead, routing depending on subdomain, I’d prefer only opening one port on my router if possible

Laudian•2mo ago

no not without plugins because you don't know what subdomain someone used to connect

マオOP•2mo ago

unfortunate how feasible is installing/ using the plugins? though imma first try it with the SRV records real quick

Laudian•2mo ago

installing? I doubt on that does exactly this exists, so you'd need to program it first.

マオOP•2mo ago

ah lol yeah ok fair enough wow that actually worked with the SRVs, thank you! now if i wanted to reuse the CNAME alpha.example.com id just need to create a new SRV on a different port and link that to some different game server, right?

Laudian•2mo ago

or change the old srv^^

マオOP•2mo ago

would both at the same time work? 👀 alpha.example.com in minecraft would go to the minecraft server and the same address would go to for example an ark server if i have two SRVs setup? because if so thatd be pretty neat

Laudian•2mo ago

yes But I believe Ark doesn't support SRV records? You can use the same subdomain for every game that supports srv records, but only one game that doesn't

マオOP•2mo ago

ah fair, i didnt check if ark does but that makes sense thanks so much for the help! you probably saved me hours if not days of trying to get this to work ^^;

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