Serving two sites from one server with Nginx

Question

I have a Rails app up and running on my server and now I'd like to add another one.

I want Nginx to check what the request is for and split traffic based on domain name

Both sites have their own nginx.conf symlinked into sites-enabled, but I get an error starting nginx Starting nginx: nginx: [emerg] duplicate listen options for 0.0.0.0:80 in /etc/nginx/sites-enabled/bubbles:6

They are both listening on 80 but for different things.

Site #1

upstream blog_unicorn {   server unix:/tmp/unicorn.blog.sock fail_timeout=0; }  server {   listen 80 default deferred;   server_name walrus.com www.walrus.com;   root /home/deployer/apps/blog/current/public;    location ^~ /assets/ {     gzip_static on;     expires max;     add_header Cache-Control public;   }    try_files $uri/index.html $uri @blog_unicorn;   location @blog_unicorn {     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;     proxy_set_header Host $http_host;     proxy_redirect off;     proxy_pass http://blog_unicorn;   }    error_page 500 502 503 504 /500.html;   client_max_body_size 4G;   keepalive_timeout 10; } 

Site two:

upstream bubbles_unicorn {   server unix:/tmp/unicorn.bubbles.sock fail_timeout=0; }  server {   listen 80 default deferred;   server_name bubbles.com www.bubbles.com;   root /home/deployer/apps/bubbles/current/public;    location ^~ /assets/ {     gzip_static on;     expires max;     add_header Cache-Control public;   }    try_files $uri/index.html $uri @bubbles_unicorn;   location @bubbles_unicorn {     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;     proxy_set_header Host $http_host;     proxy_redirect off;     proxy_pass http://bubbles_unicorn;   }    error_page 500 502 503 504 /500.html;   client_max_body_size 4G;   keepalive_timeout 10; } 

Answer 1

The documentation says:

The default_server parameter, if present, will cause the server to become the default server for the specified address:port pair.

It's also obvious, there can be only one default server.

And it is also says:

A listen directive can have several additional parameters specific to socket-related system calls. They can be specified in any listen directive, but only once for the given address:port pair.

So, you should remove default and deferred from one of the listen 80 directives. And same applies to ipv6only=on directive as well.