Proxmox gives you two ways to run things — full virtual machines and light LXC containers — and picking the right one per job is how a small host ends up running many services instead of struggling with two. The difference, the honest limits of each, and the simple rule experienced home labs settle on.
New Proxmox users often make everything a VM 'because that is what virtualisation means', then wonder why 16 GB of RAM vanished into three sleepy Linux servers. Containers exist precisely for those jobs. But containers have real boundaries too — one of them is absolute. Here is the full picture, in plain terms.
A virtual machine is a whole simulated computer: it runs its own kernel and its own operating system, exactly like a separate PC. An LXC container is a fenced-off room inside the Proxmox host itself: it shares the host's Linux kernel and runs only user-space on top. Everything else — size, speed, limits, safety — flows from that single difference.
For the classic home and office services, containers are the better tool and it is not close. A file-sharing helper, a Pi-hole style DNS filter, a media server, a download box, a monitoring agent — each runs happily in a container with 256 MB to 1 GB of RAM and starts in two seconds. Containers sip resources because there is no second kernel and no simulated hardware. They also make experimentation cheap: snapshot one, break it, roll back. Proxmox even offers ready container templates for common Linux distributions, so a new container is often running before a VM has finished booting its installer.
When you create a container, Proxmox asks whether it should be unprivileged. Choose unprivileged unless a guide for your specific software truly requires otherwise: in an unprivileged container, 'root' inside is mapped to an unprivileged user on the host, so even a full compromise of the container starts with far less power over the host. Some things — certain network shares and device access — are simpler in a privileged container, which is a convenience trade, not a free upgrade. Know which you picked and why.
Default to a container for every Linux service, and a VM for every full operating system, every Windows need, and every risky experiment. That mix is how a modest 16 GB host ends up running eight useful things instead of two: the containers carry the daily services for loose change, and the RAM you saved is what lets the one or two real VMs run properly. Choosing per workload, instead of picking a tribe, is the whole skill.
See the full Proxmox installation and first VM creation, live and step by step.
▶️ Watch Full VideoNot directly — they are different technologies, not two sizes of the same thing. The practical path is to build a fresh container for the service and migrate its data and configuration across. It is an hour of work, which is why choosing correctly at the start is worth a minute of thought.
A VM has the stronger boundary: its own kernel and simulated hardware. An unprivileged container is still well isolated for ordinary services, but it shares the host kernel, so the cautious pattern is: trusted Linux services in containers, untrusted code and experiments in VMs.
Far more than VMs, because each can live on a few hundred megabytes of RAM. The real limits become disk space and your own ability to remember what each one does. Keep a list — future you says thank you.