Docker vs VMs vs LXC: What to Use in a Homelab (2026)
Once your hypervisor is running, the next question is how to run each app: a full VM, a system container (LXC), or a Docker container? Picking right keeps your lab fast, tidy, and easy to back up. Here's the plain-English breakdown.
Virtual machines (VMs)
A VM emulates a whole computer with its own kernel and OS. It's the most isolated and most flexible option — run any OS (Windows, a different Linux, a firewall appliance) and pass through hardware. The cost: more RAM and disk per app, and slower to spin up. Use a VM for anything that needs a different OS, strong isolation, or hardware passthrough (e.g. TrueNAS, a router OS, a Windows box).
LXC (system containers)
LXC containers share the host kernel but feel like a lightweight Linux machine. They boot instantly and use a fraction of a VM's resources. Use LXC on Proxmox for persistent Linux services where you want efficiency and don't need a separate kernel — a database, a web app, or a Docker host.
Docker (application containers)
Docker packages a single app plus its dependencies into a portable image. It's the standard way to run self-hosted apps — there's a Docker image for almost everything (Jellyfin, Pi-hole, the *arr stack, Nextcloud). Updates and backups are dead simple with compose files. Use Docker for the bulk of your services.
The combo almost everyone lands on
Run Docker inside one VM or LXC dedicated to containers, alongside a few standalone VMs for the things that need them. So on a single mini PC running Proxmox you might have: one VM for TrueNAS, one LXC running Docker (hosting 15 apps via compose), and a small VM for anything exotic. Clean, efficient, and easy to back up.
A few rules of thumb
- Default to Docker for apps; reach for a VM only when you need isolation, another OS, or passthrough.
- Keep app data on a mounted volume (ideally your NAS), not inside the container — so updates and restores are painless.
- More containers = more RAM; it's the first thing you'll run out of.
Bottom line
VMs for isolation and other OSes, LXC for efficient Linux services, Docker for everything else — and most homelabs use all three. New to it all? The Homelab Starter Blueprint lays out exactly which to use for your first services.
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