Create a domain name for the content delivery through CDN. Note that a CNAME must differ from your origin source.
Add a DNS record in your website administration panel for a CNAME before using it for integration. You can find the CNAME record for your DNS settings in the resource settings in the Setup Instructions tab. The record is similar for all your resources.
cdn.example.ru. CNAME uu-98566126.gcdn.co.
For working with HTTPS your SSL certificate must secure CNAME or be a wildcard. Read more on SSL certificates.
CNAME in gcdn.co zone
If you do not have access to the DNS records or prefer to work with our shared SSL certificate you can create a CNAME in gcdn.co zone.
It is a free feature that can be activated at your request via chat or email (firstname.lastname@example.org).
A free SSL-certificate is applied for the resource by default.
Note, that the CNAME type can't be changed after a CDN Resource creation. But you could add additional CNAME clicking on a plus after CNAME field. You will be able to change or delete additional CNAME.
Check the CNAME record
Run dig command in the console on your computer or use online services.
If the CNAME was added in a right way, you will see the record as follows:
cdn.site.ru 14399 IN CNAME uu-98566126.gcdn.co.
If you see other answers, check your DNS settings or contact your hosting provider support.
As soon as your CNAME is added to DNS panel and provisioned, you can use it to integrate your website with a CDN.