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What is a custom domain?

A custom domain is a unique, branded domain name used for content delivery through a CDN. For example, if you have a website with the domain mywebsite.com, you create a CDN resource for static content delivery and specify a custom domain for it, such as cdn.mywebsite.com. This way, your static assets will be delivered to end users with URLs like cdn.mywebsite.com/sample.jpg. When specifying a custom domain, you can use any domain or subdomain for which you can edit the DNS records. For CNAME-based CDN resources, a third-level domain is typical, e.g. cdn.mywebsite.com. For CDN resources using DNS delegation to Gcore, a second-level domain is used, e.g. mywebsite.com.

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Set a custom domain (only for static CDN recources)

The instructions below describe how to set up a custom domain for CNAME-based CDN resources. For CDN resources using DNS delegation to Gcore, the custom domain is set via nameserver change at the domain registrar instead. See the CDN resource guide for details on both options. 1. When creating a CDN resource, enter your desired domain or subdomain name in the Custom domain section. Specify additional domains by clicking the + icon.
WarningYou can only add additional (multiple) custom domains if you are creating a CDN resource for static assets. If you are creating a CDN resource for the entire site, adding additional custom domains is not possible.
Custom domain
2. Copy the value cl-****.gcdn.co (which is unique for every account and the same for all custom domains of your account) from the Set up your DNS page. Click Confirm.
Copy the value
3. Go to your DNS provider’s website and create a CNAME record for the custom domain with the value in the previous step. The CNAME record should be specified as follows: 
cdn.mywebsite.com. cl-****.gcdn.co
Replace cl-****.gcdn.co with the value specific to your account. If you specified multiple custom domains in step 1, add CNAME records for all additional custom domains. Use the dig command in the terminal or an online dig tool to check the record. If the record was added correctly, you will receive a response similar to the one specified above. 4. Complete the CDN resource creation. You will see the following pop-up window when all configurations are completed:
Complete the CDN resource creation

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Check the DNS setup status

Our setup guide will verify that the configuration was completed successfully and identify any issues requiring resolution. 1. Open the settings of the CDN resource that you created. 2. Click Setup guide.
Setup guide
3. A checklist will open, displaying each step of the configuration process. A check mark indicates that the step was successful. If any stage lacks a check mark, click on the step and follow the instructions to complete the configuration. When you’re done, click Check DNS setup status.
Setup Status
If you see the message “DNS record hasn’t been set up”, check your Managed DNS settings for configuration errors.
check the DNS
If you see the message “DNS record has been successfully set up”, the configuration has been completed correctly.
completed correctly
To check the frontend of your integrated website, right-click on any static files and choose Inspect. This will show you the content delivery URL where your file is served.

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Specify additional domain (only for static CDN resources)

1. Go to the CDN resource list and click on the custom domain of the resource you want to configure.
CDN resource list
2. In the Custom domain section, click the plus sign (+) next to the Domain field and enter your desired domain name(s).
Custom domain
3. Click Save changes at the bottom of the page.
NoteAdd a CNAME record to your DNS following the instructions above for each additional domain.
Once the additional domains are set up, you can configure your website to deliver different types of static files from separate domains.