how to start puma with unix socket

Question

I have followed this link to configure nginx with puma but when I start the server with
bundle exec puma -e development -b unix:///var/run/my_app.sock
it throws Permission denied - "/var/run/my_app.sock" (Errno::EACCES) error.

but when I start the server with bundle exec puma -e development
it is started with tcp://0.0.0.0:9292

my_app.sock file does not exist in /var/run/

how do I start the server with unix socket and access the application through the domain name given in the my_app.conf file.

Can you please anyone help me?.

Answer 1

To start puma with socket binding just use /tmp directory:

bundle exec puma -e development -b unix:///tmp/my_app.sock

To access application through domain name you should use something like nginx and do configuration for it.

To install nginx in Ubuntu just run next command:

sudo apt-get install nginx

Run sudo nano /etc/nginx/sites-available/my_app.conf and place configuration below into this file (Ctrl + X, Y - to save changes):

upstream my_app {
  server              unix:///tmp/my_app.sock;
}

server {
  listen              *:80;
  server_name         my_app.com;

  access_log          /var/log/nginx/my_app-access.log;

  location /favicon.ico {
    root              /var/www/my_app/public/assets/favicon.ico;
    gzip_static       on;
    expires           max;
    add_header        Cache-Control public;
  }

  location / {
    root              /var/www/my_app/public;
    try_files         $uri @app;
    gzip_static       on;
    expires           max;
    add_header        Cache-Control public;
  }

  location @app {
    proxy_pass        http://my_app;
    proxy_set_header  X-Real-IP  $remote_addr;
    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header  X-Forwarded-Proto http;
    proxy_set_header  Host $http_host;
    proxy_redirect    off;
    proxy_next_upstream error timeout invalid_header http_502;
  }   
}

You should change /var/www/my_app and my_app.com to appropriate values.

Add symlink into enabled sites sudo ln -fns /etc/nginx/sites-available/my_app.conf /etc/nginx/sites-enabled/

Restart nginx: sudo service nginx restart.

Link your domain name to server IP (via hosts-file or DNS-provider).