multiple rails apps on nginx and unicorn

Question

I successfully setup a rails site using the Screencast 335 deploy to a VPS tutorial. Now I want to add another rails app on a new domain but I am confused about the steps required.

In the above setup, there are no changes to sites-available or /etc/nginx/nginx.conf. The only configuration is in unicorn.rb, unicorn_init.sh and nginx.conf in my apps config directory. The nginx.conf file looks like this:-

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

In my Capistrano recipe I have this line

sudo "ln -nfs #{current_path}/config/nginx.conf /etc/nginx/sites-enabled/#{application}"

Is adding a second domain merely a matter of removing default deferred after listen and un-commenting the server_name section then repeating this config file with a different upstream socket name and server name for the second app? Will that work or do I need to transfer this file to sites-available and create a symbolic link to sites-enabled?

Answer 1

In unicorn.rb:

application 1:

root = "/var/www/application_1/current"
working_directory root
pid "#{root}/tmp/pids/unicorn-app1.pid"
listen "/tmp/unicorn.app1.sock"

application 2:

root = "/var/www/application_2/current"
working_directory root
pid "#{root}/tmp/pids/unicorn-app2.pid"
listen "/tmp/unicorn.app2.sock"

In nginx.conf:

application 1:

upstream app1_server {
  server unix:/tmp/unicorn.app1.sock fail_timeout=0;
}

server {
  listen 80;
  server_name my_app_1.com www.my_app_1.com;
  root /var/www/app1/current/public;

  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  try_files $uri/index.html $uri @app1_server;
  location @app1_server {
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
  proxy_redirect off;
  proxy_pass http://app1_server;
 }

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
}

application 2:

upstream app2_server {
  # point to app2 sock
  server unix:/tmp/unicorn.app2.sock fail_timeout=0;
}

server {
  listen 80;
  server_name my_app_2.com www.my_app_2.com;
  root /var/www/app2/current/public;

  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  }

  try_files $uri/index.html $uri @app2_server;
  location @app2_server {
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
  proxy_redirect off;
  proxy_pass http://app2_server;
 }

  error_page 500 502 503 504 /500.html;
  client_max_body_size 4G;
  keepalive_timeout 10;
}