Setting NS for Subdomain to Another Hosted Zone with Same Apex Domain

Suppose I own example.com.

I delegate the subdomain www.example.com to a particular set of NS that is say a Route53 Hosted Zone. The rest of the example.com zone is not on R53 and contains important information for other subdomain/records. You can consider this Zone 1, and you can consider the new R53 Hosted Zone as Zone 2.

I want to have www.example.com CNAMEd to a particular endpoint, say a cloudfront distribution. Since I can’t CNAME the apex domain, instead hosted zone 2 is created in R53 with the original apex domain: example.com. Then, inside that hosted zone, there is a record for the subdomain www.example.com with the CNAME to xxx.cloudfront.net.

I can’t directly configure www.example.com with the CNAME in hosted zone 1 for various reasons, including that the CNAME is always changing and the person controlling the CNAME only has control over zone 2.

So the full chain looks like this: User types in www.example.com, they get NS hosted 1 records. In that zone, the record for www.example.com points to Hosted zone 2 records. In this zone (which was created with apex example.com) the record for www.example.com is a CNAME to the proper endpoint.

My question: will any DNS resolvers mistakenly cache the NS from the second zone as apex domain records? Obviously, I want those NS accessed only for the www.example.com records. If example.com NS records are mistakenly thought of as in hosted zone 2, there can be a lot of issues.

If this is the case, is there any way to make sure to DNS resolvers that the apex domain nameservers are zone 1, and zone 2 records are ONLY for www.example.com, even though they were created with the example.com apex domain?

I understand that there are other ways to do this (CNAME to separate domain, etc) but for logistical purposes (for now) I am only interested in setting the NS directly for the www subdomain.

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Is it safe to disable the bare/naked/root domain example.com and use www.example.com only?

This is Making a DNS setup for 20+ domains hosted on the same IP-address more manageable continued.

We’re already using the www version as primary. Each www is a CNAME to @, and it’s @ resolves to an IP address.

For convenience, I consider resolving each www to a common, shared CNAME, and dropping @ altogether because the it can’t be a CNAME.

Provided the website doesn’t link to example.com anywhere internally, is it a good idea to only keep www.example.com. I figured if someone types example.com and it does not exist, the browser will auto-try www.example.com, right?

Alternative to Qubes OS network domain for a server

I know that Qubes Os is not suitable for a server use, but some of its features are quite interesting for that. In fact, all the network drivers are contained in a VM that run a different Linux based system and the connections from the “main OS” to the network are made through TCP/IP with that VM. Moreover, network drivers have been moved out from the main OS kernel. That allows to prevent the use of a potential bug in the network driver.

How can I reproduce the same configuration ? I thought about using Xen with a virtual network, but I would like to know if somebody already made it.