rails nginx puma duplicate upstream "puma" in /etc/nginx/sites-enabled

Question

I've set up my server for this tutorial (https://coderwall.com/p/ttrhow/deploying-rails-app-using-nginx-puma-and-capistrano-3)

When I used one project, all works, but when I added another project to this VPS, I have error [emerg] 20737#0: duplicate upstream "puma" in /etc/nginx/sites-enabled/vsejalreg:1

My nginx's configure

upstream puma {
  server unix:///home/deployer/apps/vsejalreg/shared/tmp/sockets/vsejalreg-puma.sock;
}

server {
  listen 80;
  server_name wjreg.rubyserv.ru www.wjreg.rubyserv.ru;

  root /home/deployer/apps/vsejalreg/current/public;
  access_log /home/deployer/apps/vsejalreg/current/log/nginx.access.log;
  error_log /home/deployer/apps/vsejalreg/current/log/nginx.error.log info;

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

  try_files $uri/index.html $uri @puma;
  location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://puma;
  }

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

And

upstream puma {
  server unix:///home/deployer/apps/register/shared/tmp/sockets/register-puma.sock;
}

server {
  listen 80;
  server_name ws.rubyserv.ru www.ws.rubyserv.ru;

  root /home/deployer/apps/register/current/public;
  access_log /home/deployer/apps/register/current/log/nginx.access.log;
  error_log /home/deployer/apps/register/current/log/nginx.error.log info;

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

  try_files $uri/index.html $uri @puma;
  location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://puma;
  }

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

When I add nginx configure one by one - all work!

How fix this bag or puma not working with many project?

Thx!

Answer 1

Please note, that you need to change this part aswell:

location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://puma;
  }

Else you will run into errors such as this - nginx: [emerg] host not found in upstream "puma" in /etc/nginx/sites-enabled/furnitureapp:25

So, if you rename your upstream to

upstream puma_register

You need to rename your proxy_pass as well to

location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;

    proxy_pass http://puma_register; <------ Change here
  }