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Don McCurdy
Asked: 2016-04-18 18:22:36 +0800 CST

In Nginx, map specific subdomains to ports, redirect all others

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I'm trying to accomplish three things:

  1. Map traffic, by subdomain, to one of several applications on different ports.
  2. If subdomain isn't recognized, redirect to www.
  3. Require HTTPS on all subdomains.

My nginx configuration so far is:

map $subdomain $subdomain_port {
  default    8000;
  www        8000;
  subdomain1 8001;
  subdomain2 8002;
  subdomain3 8003;
}

server {
    listen 80;
    listen [::]:80;
    server_name _;
    return 301 https://$host$request_uri;
}

server {
    listen              443 ssl;
    server_name         ~^(?P<subdomain>.+?)\.mydomain\.com$;

    ssl_certificate     <cert>;
    ssl_certificate_key <key>;

    location / {
      # ... various proxy headers, then ...
      proxy_pass http://127.0.0.1:$subdomain_port;
      proxy_redirect off;
    }
}

This almost works (it accomplishes #1 and #3), but instead of redirecting foo.mydomain.com to www.mydomain.com, it just serves the www content without redirecting. I'm not sure how to redirect un-mapped subdomains without splitting the whole thing into separate server blocks, which I'd really rather not do.

Is there a way to redirect all subdomains not explicitly mentioned in the map to www?

subdomain redirect nginx wildcard-subdomain

3 Answers

  1. Just implement a default server. Here's mine

    server {
  listen      80 default_server;
  server_name _;
  return 302 https://www.example.com;
}

    You can do whatever action you want.

    • 1

  2. Just to say that on AWS, I needed to add an A record "*.staging.mydomain.com" in Route53 pointing to the same EC2 instance IP (like the record for "staging.mydomain.com")

    • 1

  3. The following works for me...

    1. Let the default port be different from port for www.
    2. Let Nginx listen in the default port and redirect all traffic to www.

    Here is the change in Nginx config to make it work...

    map $subdomain $subdomain_port {
  default    8888;
  www        8000;
  subdomain1 8001;
  subdomain2 8002;
  subdomain3 8003;
}

server {
    listen 8888;
    server_name _;
    return 301 https://www.domainname.com/$request_uri;
}

# other configs remain the same

    I used 8888 as the default port. Any unused port should work.

    • 0