this post was submitted on 07 Aug 2023
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I think you're blowing this way out of proportion. It's literally not a substantial amount of extra overhead, it's minimal and for what one would provide in the long run it is worth mentioning.
Well by the sounds of it, he has multiple clients. So then we're talking multiple domains in a forest. Securing it all and doing it properly.
So it's a bit more than just running the domain setup wizard and joining the servers.
Why would there be more than a single domain and forest? Client size does not dictate the architecture and joining a client to the domain takes a few minutes manually. I don't see what you're getting at, sorry.
Edit: instead of being upset and downvoted, whoever disagrees can provide an argument. I'm all for discussing this, I've been doing it for a long time and enjoy different opinions.
He said 15 VM's running for clients. Now you would want to secure these clients from each other, restrict east to west movement. Adding them all on the same domain introduces security risk, reducing them risk and hiding clients from one and other in the same domain would take lots of effort. So just don't put yourself in that situation and use multiple domains one domain for each client.
Lol you can absolutely control E/W movement without needing multiple domains..
Worst case you use a red forest as the admin forest, but with an environment that small there are plenty of other things you can do without making it that complicated while providing similar protection.
Then you start getting things like Azure AD Sync etc. It's best practice one domain per client. Not trying to make one domain work for multiple different clients.
You don't need anything from Azure to do that. Authentication policy and silos are what enforces multi tenancy east west boundaries (among many, many other layers outside of the scope of this conversation).
But it looks like I misread what the "client" context was initially. So that's my bad. That does muddy the waters and would depend on what the agreements are between the companies and OP have. But this isn't a technical constraint rather a business and legal decision.