在Route 53中，需向客户端提供何种IP地址以指向我方域名？

Hey there! Sounds like you're trying to set up white-labeled domains for your SaaS customers—totally doable, and I’ve walked through this setup plenty of times before. Let’s break down exactly how to make it work.

核心逻辑先搞懂 #

This boils down to a combo of CNAME domain mapping and Host Header recognition. When your customer points their domain to your hosting provider (Company B), the provider needs to check the "Host" tag in every incoming request to figure out which customer's site content to serve up.

具体实施步骤 #

• Step 1: Guide your customers to configure domain DNS
  Have your customers log into their domain registrar's backend and add a CNAME record. Their domain (e.g., client-business.com) should point to the access domain provided by your hosting service (e.g., saas-proxy-companyb.com). If they need the root domain (no www) to work too, some registrars support ALIAS records or allow root domain CNAMEs—just confirm with their provider.

• Step 2: Set up site recognition rules with Company B
  You’ll need to configure your hosting provider to map specific customer domains to their corresponding sites on your platform. In plain terms: tell the provider, "When a request comes in with the Host header client-business.com, send it to this customer's dedicated site folder/container on our platform."

  • If you’re using Nginx as a reverse proxy (common in many hosting setups), the config snippet would look something like this:

    server {
        listen 80;
        listen 443 ssl;
        server_name client-business.com www.client-business.com;
    
        # SSL cert config (use a wildcard or multi-domain cert for all customers)
        ssl_certificate /path/to/your/wildcard-cert.pem;
        ssl_certificate_key /path/to/your/wildcard-key.pem;
    
        location / {
            proxy_pass http://your-saas-platform/internal-client-site-id;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $remote_addr;
        }
    }
    

  • If your provider uses a visual control panel (like cPanel or Plesk), just look for "Add Domain Binding" or "Host Header Setup" options, then link the customer’s domain to their dedicated site directory.

• Step 3: Route requests internally in your SaaS platform
  Your platform needs to tie incoming domain requests to the right customer data. Here’s a quick flow for your backend:

  1. Grab the Host value from the incoming request
  2. Match it to a mapping in your database (domain → customer ID/site ID)
  3. Pull the customer’s custom site config, data, and themes, then serve up their unique page content

关键细节别忽略 #

• SSL Certificates: To make HTTPS work for all customer domains, use a wildcard SSL certificate or a multi-domain certificate (Let’s Encrypt offers free options for this). Most hosting providers can auto-renew these certs for all bound domains—confirm this with Company B upfront.
• DNS Propagation Time: Warn customers that after configuring DNS, it might take 10 minutes to 24 hours for changes to roll out globally due to DNS caching.
• Filing Requirements: If you’re using a Chinese hosting provider, customers will need to complete ICP filing for their domain before it can be bound to your platform. Make sure to communicate this early to avoid delays.

内容的提问来源于stack exchange，提问作者Anastasia Beaverhausen