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Redirect subdomains to another subdomain

If you want multiple subdomains pointing to the same subdomain or root domain, you can use Cloudflare to redirect the subdomains.

The domain or subdomain needs to be the default and already be configured. For a github page see Github Custom Domain to realize this.

In thie example the main subdomain is page.example.com and new redirected subdomains are pages.example.com and docs.example.com.

Steps

  1. Within cloudflare add a DNS Record for each subdomain you want to redirect. In this example, we add two A records for pages.example.com and docs.example.com pointing to the cloudflare ip 192.0.2.1 this allows cloudflare to add custom rules. 
    pages.example.com.  1   IN  A   192.0.2.1 ; cf_tags=cf-proxied:true
docs.example.com.   1   IN  A   192.0.2.1 ; cf_tags=cf-proxied:true
  2. In the cloudflare section for that domain goto Rules and add the following rule:
  3. Redirect Rules
  4. Custom filter expression
    • Field Hostname Operator wildcard Value pages.example.com
    • OR
    • Field Hostname Operator wildcard Value docs.example.com
  5. Then
    • Type Dynamic Expression concat("https://page.example.com", http.request.uri.path) Status code 301
    • Check Preserve query string
  6. Wait a few minutes for the DNS records and rule to propagate.
  7. Done! Now you can access your Webpage with your two new custom domain. pages.example.com and docs.example.com