Question

Application service available through single domain using Nginx

I have an Ubuntu-20.04 server, and I am using this to deploy multiple docker containers and using reverse proxies to host them on Nginx.

I have 2 domains linked to my server (Single Public IP). Let’s name them domain1.com and domain2.com

Now I have 2 service running on docker, Postgres (port 5432) and MySQL (port 3306)

I set up reverse proxies to translate domain1.com to localhost:5432 and domain2.com to localhost:3306:

server {
  listen        80;
  server_name   domain1.com;

  location / {
    proxy_pass  http://localhost:5432;
  }
}

server {
  listen        80;
  server_name   domain2.com;

  location / {
    proxy_pass  http://localhost:3306;
  }
}

The thing that is bothering me here is that if I try to access domain1.com:3306, the connection works which I don’t want.

I want each domain to be accessible by the service assigned to them only.

For example a telnet to domain1.com:5432 should work but a telnet to domain1.com:3306 should fail. (I hope this makes sense here)

Can someone please help me achieve this?


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Hi @th3pl4gu33,

hmm, are those ports available to the public? My first thought, is to actually deny both these ports publically and make them accessible only internally.

If the above doesn’t work or if you want to make even a safer option, maybe you can create redirection rules. When the mentioned ports are accessed to redirect requests to your main websites. I think this one should be pretty straightforward as the first suggestion.

Regards, KFSys