[pbs-devel] [PATCH v2 backup 02/27] add dns alias schema

[Thomas Lamprecht]

On 28.04.21 18:10, Dietmar Maurer wrote:
> Seems DNS names in general are totally unrestricted and
> may contain arbitrary binary data:
> 
> https://tools.ietf.org/html/rfc2181#section-11
> 
> Only host names and url are restricted.
> 
> ?!

FYI, from a off-list message from Wolfgang:

>> and why now only allow as first one?
> mostly because that's what we did in PVE and because using underscores
> anywhere else is silly ;-)
> it's used for scoping, there was even an RFC draft but it's expired and only
> marked as "best current practice" whatever that's worth:
> https://tools.ietf.org/id/draft-ietf-dnsop-attrleaf-07.html#rfc.section.1.1
> so basically: we used to not allow underscores, people do use leading
> underscores for scoping, and we use it particularly for ACME aliases...

There was some confusion with which ALIAS you meant, as there's a not really
used DNS record type named "ALIAS" too (which is unrelated to that one here).