Ran into an error with my Openshift configuration saying my route must conform to the DNS 952 subdomain conventions.
What are they?
2 Answers
According to Microsoft's article about naming conventions
For DNS host names:
DNS names can contain only alphabetical characters (A-Z), numeric characters (0-9), the minus sign (-), and the period (.). Period characters are allowed only when they are used to delimit the components of domain style names.
and the disallowed characters are:
DNS host names can't contain the following characters: comma (,), tilde (~), colon (:), exclamation point (!), at sign (@), number sign (#), dollar sign ($), percent (%), caret (^), ampersand (&), apostrophe ('), period (.), parentheses (()), braces ({}), underscore (_), and white space (blank)
So if you configure Openshift using a template.yml be sure to not have any extra braces (from parameters), or use any of the other illegal characters.
RFC 952 is simply at https://datatracker.ietf.org/doc/html/rfc952 but itself later revised by other RFCs.
The recent DNS Terminology RFC (8499) gives you the definition and links you need, have a look at https://datatracker.ietf.org/doc/html/rfc8499#section-2
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