如何将主域名与子域名分别指向不同的主机服务商？

Hey there, great news—this is totally doable without moving either of your sites, which aligns perfectly with your CEO's request. Let's walk through the step-by-step process:

1. Update DNS Records (Managed by Your Member Services Company) #

Since your domain is currently hosted with the member services firm, you'll need to adjust the DNS settings in their control panel:

• Point www.example.com to Provider X's staging site:
  • If Provider X gave you a static IP for the staging site, create an A Record where www points to that IP address.
  • If they provided a staging subdomain (like staging.providerx.com), create a CNAME Record where www maps to that staging domain.
• Point members.example.com to your existing member site:
  • Create a new A/CNAME record for members that points to the same IP/domain your original www.example.com was using (the member services host).
• Pro tip: Temporarily set the DNS TTL (Time to Live) to a low value (like 300 seconds / 5 minutes) so changes propagate faster. You can set it back to the default (usually 86400 seconds) once everything is working.

2. Configure Domain Bindings on Both Hosts #

Next, you need to make sure each host recognizes the new domain assignments:

• Provider X (Staging Site):
  • Log into their hosting control panel and update the site's domain binding to include www.example.com.
  • If you have access to the server config (e.g., Nginx/Apache), update the server_name (Nginx) or ServerName/ServerAlias (Apache) to explicitly include www.example.com so the server knows to route requests to the staging site.
• Member Services Company (Existing Site):
  • Ask their support team (or use their control panel) to add members.example.com as an additional domain binding for your existing site.
  • Ensure their server config is updated to accept requests for members.example.com and route them to your original member site content.

3. Verify SSL Certificates (Critical for HTTPS) #

Don't forget about SSL—users will get browser warnings if this is missed:

• For www.example.com: You'll need to request a new SSL certificate from Provider X (most hosts offer free Let's Encrypt certificates via their control panel) since the old certificate was tied to the member services host.
• For members.example.com: You can either re-use the existing SSL certificate (if it's a wildcard certificate for *.example.com) or request a new one for the subdomain through the member services company.

4. Test Everything Thoroughly #

• Use command-line tools like dig www.example.com or nslookup members.example.com to confirm DNS records are pointing to the correct IPs.
• Clear your browser cache (or use incognito mode) to test both domains:
  • www.example.com should load the staging site from Provider X.
  • members.example.com should load your original member site.
• Wait a few hours to ensure global DNS propagation is complete (even with low TTL, some ISPs cache longer).

内容的提问来源于stack exchange，提问作者Gigi