I know people in that predicament and they're, charitably, helpless little babies when you tell them to read two paragraphs of documentation on how to run one command in a Linux CLI.
Fundamentally nothing out there really caters to the needs of resellers. Your average resale company couldn't automate a backup job to save itself from bankruptcy if it doesn't come with a neat GUI, a 24/7 support contract, and preferably a Microsoft or oracle logo somewhere in the corner to inspire confidence.
Like I jest but there are Microsoft outfits and FOSS outfits and there is essentially zero professional overlap even though they both sell IT products/solutions. The disconnect is a mile wide. Which translates to wildly different business models where the FOSS people have been running shit in containers for 15 years while the Microsoft slaves are still licensing their monolithic solutions by the CPU Core and doing weird-ass shit like buy 4-core xeons because it's more economical with these archaic licensing models.
So sure Proxmox/Suse are certainly very happy with their sales number right now but anecdotally I'm not seeing the migration frenzy that one would expect under such intense price gouging. Broadcom correctly identified that it will take years for these super corporate structures to steer away from "the way we've always done things" and in the meantime that's untold millions in additional short-term profits.
Suse has been trying pretty hard with Harvester. KVM-based, VMs-as-k8s-pods which leverages all existing k8s tooling, as well as the same multi-cluster federation as RKE2.
Seems pretty great from afar, though it's very much under active development.
Most apps run best as a container, but for appliances and legacy apps they have Openshift virtualization which runs VMs in the cluster by running KVM inside of docker.
The open source tech there is called Kubevirt. All VMs are 1st class citizens in the kubernetes API, so it is actually easier to run than VMware/Proxmox if you already have a Kubernetes cluster and you're not doing complex stuff with qcow images or VM migrations.
I use both containers and VMs a lot with Kubernetes at work.
There’s Openshift Virtualization included, which is based on the upstream kubevirt project. You’re essentially running VMs in containers and managing them (mostly) like the other container workloads in the environment.
Interesting...I'm using proxmox at home but running my containers in a VM. Looks like there's an openshift community edition...I may have to check this out.
I'm not a sys admin by trade (networking), but my opinions at least have some weight where I work.
I imagine being redhat based, I could run FRR at the hypervisor level. For that matter being kubernetes I can use calico. Holy shit this could be awesome. I need to play.