使用NGINX反向代理至localhost:3000

sudo apt-get install nginx

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

http {
        ...
        include /etc/nginx/sites-enabled/*;
        ...
}

sudo vim /etc/nginx/sites-available/your-domain.name

server {
    listen 80;
    listen [::]:80;
    index index.html;
    server_name your-domain.name;    # 若沒有domain的話，該行可以拿掉

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

sudo ln -sf /etc/nginx/sites-available/your-domain.name /etc/nginx/sites-enabled/your-domain.name

sudo nginx -t
sudo systemctl restart nginx