Nginx: Forward all Subdomains

Question

My code doesn't work with second level tld's like domain.co.uk

Here is my conf:

  # add www.
  if ($host ~ ^(?!www)) {
   rewrite ^/(.*)$ http://www.$host/$1 permanent;
  }

  # remove subdomain
  if ($host ~ "^www\.(.*)\.(.*\.([a-z]{2,4}|[a-z]{2}\.[a-z]{2}))") {
   set $host_without_sub $2;
   rewrite ^/(.*)$ http://www.$host_without_sub/$1 permanent;
  }

score 2 · Answer 1 · answered May 25 '10 at 17:46

Your original configuration is not taking advantage of the nginx configuration. With a rewrite like that nginx will have to do extensive parsing on each request. If you are in an environment where performance and quick response time is essential then you'll want to use server blocks.

# Add www and redirect subdomains.
server {  
    listen      80;
    server_name domain.com *.domain.com;
    rewrite     ^ http://www.domain.com$request_uri permanent;
}

This way there is no complex parsing, Nginx uses a hash table for the server lookups and the rewrite uses the already parsed $request_uri variable.

I can not use server_name as I'm having thousands of domains with the same configuration. Or do you know a dynamic server_name filling? And I don't want to use sites-enabled/ as it is to complex to edit. Look at my question again. I've posted a working version. P.S. We did not found any performance differences with or without regex. — mgutt, May 27 '10 at 08:49

score 1 · Answer 2 · answered May 25 '10 at 17:27

1

I'm not sure why you have two versions. Here's what I have in my config. it removes www. from the start of any domain:

server {
    # omitting listen/server_name/access_log/error_log

    if ($host ~* www\.(.*)) {
        set $wwwless $1;
        rewrite ^(.*)$ $scheme://$wwwless$1 permanent;
    }

    # locations, other rules, etc
}

answered May 25 '10 at 17:27

Oli

1,791
17
27

"why you have two versions" Because you don't understand my question. They are completly different rewrites (add www, remove subdomains). – mgutt May 27 '10 at 08:43

score 0 · Accepted Answer · answered Oct 10 '20 at 11:59

This worked for me:

# rules
server {

    #general
    listen 80;

    # add www.
    if ($host ~ ^(?!www)) {
        rewrite ^/(.*)$ http://www.$host/$1 permanent;
    }

    # remove subdomain
    if ($host ~ "^www\.(.*?)\.(.{3,}\.([a-z]{2}\.[a-z]{2}|[a-z]{2,4}))$") {
        set $host_without_sub $2;
        rewrite ^/(.*)$ http://www.$host_without_sub/$1 permanent;
    }

Nginx: Forward all Subdomains

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