server {
    listen 0.0.0.0:80;
    server_name yourapp.com;
    access_log /logs/yourapp_access.log;
    error_log /logs/yourapp_error.log;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header HOST $http_host;
        proxy_set_header X-NginX-Proxy true;

        proxy_pass http://[your_node_container_link_alias]:3000;
        proxy_redirect off;
    }
}