I’ve been running Proxmox as my main hypervisor for over five years, and one of the most common questions I see is whether someone should use Proxmox or Docker. The short answer is that they’re not really competing — they solve different problems. But understanding when to reach for each one makes a big difference in how your setup actually works.
What Proxmox Actually Does
Proxmox is a bare-metal hypervisor — you install it directly on your hardware, and it becomes the OS. From there, you can spin up KVM virtual machines and LXC containers, manage software-defined storage and networking, and if you have multiple nodes, build a high-availability cluster. I’m currently running Proxmox VE 9.1.2 on my two-node cluster and a couple of mini PCs as test devices, and it handles everything from Home Assistant, to a Windows 11 VM and even a pfSense router — all on the same box.
The web UI is genuinely good. Managing VMs, adjusting resources, setting up backups — it’s all accessible without touching the command line if you don’t want to. That said, Proxmox is infrastructure software. It’s designed to manage entire systems, not just run a single app.
What Docker Actually Does
Docker is not an operating system. It’s an application you install on top of an existing OS — Linux, a VM, a NAS, even a Raspberry Pi. I’ve used Docker as the primary way to run applications across nearly every setup I’ve had, from a Synology NAS to bare Ubuntu to a VM/LXC container inside Proxmox.
The advantage is that Docker containers are extremely lean. Each one runs in isolation, shares the host kernel, and uses minimal resources compared to a full VM. The container ecosystem is massive — whatever service you want to run, there’s almost certainly a pre-built image for it, and you’ll find tutorials everywhere.
One thing to keep in mind: Docker is a command-line tool by default. If you want a UI, you’ll need something like Portainer. I ran Portainer for a while before switching to Dockge for managing compose stacks, then switching back to Portainer — both work fine, it just depends on your preference.
Where Each One Makes Sense
Use Proxmox when: – You need to run full virtual machines — Windows 11, pfSense, a full Linux server with its own kernel – You want strong isolation between workloads (separate VMs vs. containers sharing a host) – You’re building a homelab and want one platform that handles everything: compute, storage, networking – You need features like GPU passthrough or live migration between nodes
Use Docker when: – You need to run a specific application or service and a container image exists for it – You already have a Linux machine running and don’t want to rebuild around a hypervisor – You care about resource efficiency — containers spin up fast and use far less RAM and CPU than VMs – You’re on lower-powered hardware like an Intel N100 mini PC or a Raspberry Pi.
Here’s the thing — when I consolidated my home lab down to a couple of low-power mini PCs running Proxmox as a test, my average power draw dropped from around 250W to roughly 45-50W for my Proxmox nodes. Docker containers running inside those LXC containers accounted for the majority of the actual services that I was using.
Running Docker Inside Proxmox
This is actually the setup I’d recommend for most people building a homelab from scratch: install Proxmox on your hardware, create a VM and run Docker inside that. You get the flexibility of Docker’s container ecosystem with Proxmox’s VM management, backup tools, and snapshot capabilities on top.
I’ve set this up on GMKTek mini PCs running Intel N100 processors — the performance is solid for running 10-20 containers alongside a couple of VMs.
The one caveat: if you’re trying to do advanced networking — like giving containers their own IP addresses on your LAN — it gets more involved. Docker Macvlan networks work, but the configuration takes more thought than a simple bridge setup.
The Actual Decision
There are really only two scenarios worth thinking about:
1. Do you need to run virtual machines?
If yes — whether that’s Windows 11, Home Assistant OS, pfSense, or anything else that requires its own kernel — you need a hypervisor. Proxmox is the best free option. If you want to compare it to alternatives, XCP-ng is worth a look too, but for most homelabs, Proxmox wins.
2. Do you just need to run containerized services?
If you already have a Linux box, NAS, or even a Raspberry Pi running, Docker is the faster path. I wouldn’t spin up a full Proxmox server just to run a handful of Docker containers — that’s more infrastructure than the job requires.
If you’re not sure which camp you’re in yet, I’d start with Proxmox. You can always run Docker inside it, and you won’t hit a ceiling when you eventually want a VM. If you need help getting started, installing Proxmox VE is straightforward, and the beginner-friendly mini PC options keep the cost manageable.
The right tool depends entirely on what you’re running — and most setups end up using both.
