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I'm using Centos with Nginx and Puma. I would like to redirect all subdomains to my main root domain, so I was following the instructions here -- https://stackoverflow.com/questions/26801479/nginx-redirect-all-subdomains-to-main-domain . However I can't get it to work. Below is my configuration

upstream projecta { server unix:///home/rails/projecta_production/shared/sockets/puma.sock; } server { listen 80; server_name mydomein.com; return 301 http://mydomein.com$request_uri; root /home/rails/projecta_production/public; # I assume your app is located at this location location / { proxy_pass http://projecta; # match the name of upstream directive which is defined above proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } location ~* ^/assets/ { # Per RFC2616 - 1 year maximum expiry expires 1y; add_header Cache-Control public; # Some browsers still send conditional-GET requests if there's a # Last-Modified header or an ETag header even if they haven't # reached the expiry date sent in the Expires header. add_header Last-Modified ""; add_header ETag ""; break; } }

If I exclude the "return 301 http://mydomein.com$request_uri;" line then my site will work on the root domain ,but not on any of the sub-domains (e.g. viewing a subdomain will yield the default Nginx index page). How do I redirect all sub-domains to my main domain and preserve my Rails/Puma configuration?

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You are currently listening on the apex domain vhost for the redirect. What you need to do is have a separate vhost listener that redirects to the apex. This is an example of a wildcard listener redirecting to the apex domain definition:

upstream projecta { server unix:///home/rails/projecta_production/shared/sockets/puma.sock; } # Listener for all subdomains server { listen 80; server_name *.mydomein.com; # If you want to redirect all requests, not just subdomains, use below config instead. # server_name _; return 301 http://mydomein.com$request_uri; } # Listener for Apex Domain server { listen 80; server_name mydomein.com; root /home/rails/projecta_production/public; # I assume your app is located at this location location / { proxy_pass http://projecta; # match the name of upstream directive which is defined above proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } location ~* ^/assets/ { # Per RFC2616 - 1 year maximum expiry expires 1y; add_header Cache-Control public; # Some browsers still send conditional-GET requests if there's a # Last-Modified header or an ETag header even if they haven't # reached the expiry date sent in the Expires header. add_header Last-Modified ""; add_header ETag ""; break; } }
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