How do I do CNAME setup?

CNAME setup is a manual process available to paid Cloudflare plans only at the Business or Enterprise level. With CNAME setup, authoritative DNS remains elsewhere, and one or more subdomains are delegated to use Cloudflare using CNAME DNS record(s). You do not need to use this if you've already changed nameservers to Cloudflare and want us to be your authoritative DNS provider.

Note: If you want to add a CNAME record to Cloudflare, that is free on all plans and it is different from a CNAME setup. For more information on setting up a CNAME record, see: 

 

Interested in CNAME setup?

First, submit a ticket with the domain you would like to set up via CNAME.

Use the subject line "CNAME setup <domain>" for faster review.

Remember, this is for Business and Enterprise plans only and shouldn't be confused with setting up a CNAME record.

Allowing a CNAME setup is entirely at the discretion of Cloudflare. We're always curious to learn how we can improve our DNS to meet your needs.

CNAME setup process

If approved for CNAME setup - per our review process and policies - the process is as follows:

  1. Create a Cloudflare account and add your website, following the standard process.

  2. Verify your DNS records on Cloudflare for accuracy. Cloudflare will need records to resolve to your origin server corresponding to the subdomains that are being routed into Cloudflare (like www, for instance).
  3. STOP at Step 4 of the setup, where the website instructions ask you to change your nameservers. Do not change your nameservers.

  4. Create a Cloudflare Support ticket citing the domain name to be converted to the CNAME setup. Remember the Business and Enterprise plans offer custom cert upload but we'll also provide a Cloudflare-issued Universal SSL certificate. This certificate will be deployed once your domain is activated and proper DCV records have been added to your authoritative DNS provider. These DCVs can be fetched from our API.

  5. unique TXT record will be shown in the Overview section of your Cloudflare Dashboard as well as provided to you by your Cloudflare contact.

  6. Add the TXT record to your authoritative DNS on the root record, with the subdomain host cloudflare-verify.example.com (replace example.com, of course). The TXT record value will be a number (e.g. 856172357-3825555). Leave this TXT record in place for as long as you want the domain to be active on Cloudflare.

  7. Cloudflare will verify the presence of the TXT record automatically and email you confirmation of completion. (This may take a few hours.)

  8. Add CNAME(s) to your authoritative DNS provider following the format provided (more detail below).

  9. You're done!

 

Important notes

All requests accelerated and protected by Cloudflare will come from the Cloudflare IP addresses. Please make sure to whitelist all Cloudflare's IPs. If you throttle or rate-limit these requests, your website will appear to be offline.

To see the original visitor IP address, we recommend installing mod_cloudflare to pull the original visitor IP address from the HTTP headers included with every request.

In Step 2 of adding your website, toggle the clouds to orange for the subdomain(s) you want Cloudflare enabled for. For the other subdomains, mark them as gray.

Limitations of CNAME setup

Domains using CNAME setup have two limitations:

  1. The DDOS protection for attacks against DNS infrastructure is only available for the delegated records.

  2. Cloudflare's security and acceleration benefits are only available on delegated subdomains, such as www.example.com. The root domain, such as example.com, cannot be protected or accelerated via Cloudflare. This is due to DNS RFCs.

To send root domain traffic to Cloudflare, you may add a redirect on your webserver (.htaccess file or similar) to forward traffic to the subdomains proxied by Cloudflare.

CNAME format

When you reach Step 7 above, after verification of your TXT record is complete, use these formats.

The edit to the CNAME on your authoritative DNS editor (not in Cloudflare's DNS settings) is to append .cdn.cloudflare.net to the entire hostname. The format of the CNAME record will be like this:

www.domain.com CNAME www.domain.com.cdn.cloudflare.net

You can add one or as many CNAMEs as you like to your authoritative DNS. Make sure there is a corresponding record in the Cloudflare DNS Settings that is marked with an orange cloud. Make sure the record(s) you want are enabled by toggling the clouds to orange. Replace EXAMPLE.COM with your domain in the URLs below.

https://www.cloudflare.com/a/dns/example.com

The logical flow of a CNAME lookup is shown in the diagram below:

cname.png

 

Cloudflare Settings

Decide on your Cloudflare Settings. The defaults are fine, but you can start to get a feel for the options. Replace EXAMPLE.COM with your domain in the URL below.

https://www.cloudflare.com/a/overview/example.com

More on SSL

If you need the Cloudflare-issued SSL with CNAME setup, you must always have CNAME verification records in place to verify the domain. You can use this Cloudflare API call to obtain SSL verification CNAME records to trigger the certificate to be issued.

You may also upload your custom SSL certificate as a Business or Enterprise customer.

Turning off Cloudflare

Once the record is live, you'll have two ways to disable Cloudflare:

1) On the Cloudflare DNS Settings page, disable the proxy (toggle the cloud to grey). You'll still use Cloudflare DNS for that record. If your authoritative DNS doesn't change, but it will be DNS only, you will receive no security or acceleration benefits from using Cloudflare.

2) Remove the CNAME record pointing to Cloudflare from your authoritative DNS.

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