Am not getting the domainNameLabel correct

Hope it's okay to post a general question here that is not really an issue, but more my lack of understanding on what is being expected. I'm following this post on the Dell site (https://community.emc.com/docs/DOC-80070) to prepare and run this template. The writer said that the value for the Domain Name Label parameter in the setup script must be used as the CN in the SSL certificate that is created. In his example he has this value as "CN=cseregistry.rack04.cloudapp.azs.mhclabs.com". So in my setup script (and in my certificate) I used the value of "csregistry.local.cloudapp.azurestack.external", as this seemed comparable for my Azure Stack SDK environment. But when I run the deploy script, the deployment fails, complaining that "The domain name label csregistry.local.cloudapp.azurestack.external is invalid. It must conform to the following regular expression:
^[a-z][a-z0-9-]{1,61}[a-z0-9]$." Obviously I am misunderstanding something. Can anyone set me straight on this?

从报告中引用的 setup script 和 deploy script 开始，然后将它们对 Domain Name Label 的处理与链接的 Dell 指南进行比较。记录参数预期使用的值，以及它与 SSL 证书 CN 的关系；当 deployment 要求明确无歧义时，该 issue 即完成。

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