Set up a partial (CNAME) zone to work with subdomain

[ernesto1]

Hello, Im trying to setup just a subdomain to work with Cloudflare.
I was told by CF support that I can only do it with the business account (or enterprise) via setting up a partial zone, so I already have the business account and begun working with the instructions on this link: https://developers.cloudflare.com/dns/zone-setups/partial-setup/setup/

But since Im not an expert on this DNS zones configuration perhaps someone here can guide me on how to set it up.

I did create the txt record for verifying the ownership: cloudflare-verify.mydomain.com (was done and accepted by CF)

On the Cloudflare DNS Manager I’ve created this record:
|A| subdomain.mydomain.com | ip-address, it is the only one proxied.

As per the instructions link now I must delete / créate a A record on the server DNS zones.

I think I should delete the current one for the subdomain, it is a A record, subdomain-name | ip-address and créate a new one: A | subdomain.mydomain.cdn.cloudflare.net | I dont know if the IP address should be included. If anything goes as I´ve written.

This is how it should be configured?

Thank you in advance for your suggestions.

[sandro]

Am I right to understand you already enabled the CNAME setup for your domain?

In that case you would just need to add the record to Cloudflare and should then have a hostname host.domain.cdn.cloudflare.net which you can use for a new CNAME record at your authoritative nameservers.

What’s the actual hostname in question?

[sandro]

But the link you posted really has all the required steps. Just follow them and the setup should work. And no, you won’t need IP addresses, that’s the idea of a CNAME setup.

[ernesto1]

Hello Sandro, thank you for your reply

Here is what I got so far, this is in Cloudflare DNS manager

https://justpaste.it/258d5

I think I should delete this record on the server side (the one with the red square)

https://justpaste.it/45y9e

and create (server side) a new record A with value: catalogos.impuls.cdn.cloudflare.net, the instructions say A or CNAME, is it ok with A?

What I want to achieve is that only what it is under catálogos.impuls.com.mx is proxied via Cloudflare, leaving the main domain untouched.

I want to be sure that the steps are properly configured so I dont leave the service off line while I return to the original config and try again.

Thank you !

[sandro]

All right, the Cloudflare hostname is online

catalogos.impuls.com.mx.cdn.cloudflare.net

However, the configuration on your authoritative nameserver does not seem to be correct.

You’d need a catalogos CNAME record which points to the mentioned hostname, but you don’t have that - DNS Checker - DNS Check Propagation Tool

Drop the A record and set up mentioned CNAME record instead.

[ernesto1]

Yes, the récord on the server is not yet created so on that side must delete the current subdomain récord and create a CNAME récord with value catalogos.impuls.com.mx.cdn.cloudflare.net

Should be this way? thank you

[sandro]

Precisely as I mentioned before.

[ernesto1]

Thank you Sandro, the récord will be added tomorrow early morning, as this: JustPaste.it - Share Text & Images the Easy Way
I’ll let you know how it went.

Thanx

[ernesto1]

Hello sandro, good day, the changes were made, the link you provided yesterday (DNS Checker - DNS Check Propagation Tool) shows that the cname record is resolving and propagating, in the meantime I not error when loading the site, and when loading catalogos.impuls.com.mx.cdn.cloudflare.net I also see a page error, Im guessing is because of the same. ( Error 1001 Ray ID: 729a5bcc1ea12ee9 • 2022-07-12 14:09:46 UTC ## DNS resolution error)

[sandro]

Hi Ernesto, yeah, seems to work now.

[ernesto1]

Thank you so much for your assistance.