gistfile1.nginxconf

server {
  server_name tracker.io;
  listen  80;

  root /home/joseph/taller/el-tracker;

  try_files $uri @nodejs;

  location @nodejs {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    # proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;

    proxy_pass  http://127.0.0.1:3000;
  }
}

De esse jeito me devolve

Cannot GET /

server {
  server_name tracker.io;
  listen  80;

  root /home/joseph/taller/el-tracker;

  try_files $uri @nodejs;

  location @nodejs {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;
    proxy_set_header X-NginX-Proxy true;

    proxy_pass  http://localhost:3000;
  }
}