Hi
Seeing as you intend to run several servers in a medium to large environment, I’d strongly suggest to use virtualization. This is 2022, servers directly installed on hardware are - at least in Europe / US - a thing of the past. I have about 30 clients, all use Proxmox as virtualizer and all systems run virtualized.
This gives you several advantages, among them:
- Instant snapshots (eg before a critical upgrade
- Live Backups of all systems (Windows, Linux, BSD, etc)
- Fast Migration between nodes or full High Availability.
- Hardware independence.
- VMs do not need to handle eg RAID, this is handled by Proxmox.
- Several more features…
A sample of using virtualisation - even for the Cloud!:
A friend of mine works in Germany, at a NOC (Network Operating Center) for the regional government. In 2010, they had about 60 servers there, all 19" Rack versions from HP.
Since a few years, they switched to 10 powerful servers running Proxmox, In this cluster, the 60 servers are still running, albeit all virtualised.
Much less work, far higher availability, less costs and energy usage (also cooling!), also much more stable. And a lot of savings!
One really BIG advantage is the option to create “neutral” VMs which can be allocated to a duty. Like MS-SQL. Create a clean Master. If any department needs a new SQL, or even just a server for testing, it can be cloned from the “master”, and be ready in a couple of minutes. Even using scripting, this would not be possible using real hardware underneath - it would take MUCH longer!
Mail-Concept / DKIM
DKIM is strongly dependent on correct setup of the mailserver, including DNS, IPs but also SPF, SMTP helo, and several other stuff…
For your concept, you would need at least several static IPs, all with correct name-lookups (Reverse DNS / PTR).
On a “normal” NethServer (eg: single domain) setting DKIM is fairly easy, the greatest challenge is often the DNS Interface of your DNS-Provider…
See here for more Info:
https://wiki.nethserver.org/doku.php?id=email_protection_resources
And don’t hesitate to ask questions if you’re stuck!
Our Motto here is:
The only dumb questions are those not asked!
My 2 cents
Andy