Selfhosted

Run everything in docker containers. Much easier to manage than virtual machines and lighter on resources.

User accounts are a reasonable isolation mechanism for reasonably trustworthy server software.

In any case I wouldn't host on a machine I use daily (i.e. a personal computer). Worst case is an attacker wiping your machine or encrypting everything and holding your data hostage. If that happened to one of my servers I'd just shrug and reimage.

If performance is paramount or you have a low resource device like a rPi then containers are fine. If you have something with decent processing power I say go the extra mile and setup a simple VM using Qemu. A few distros offer cloud images so you don't have to install from an ISO.

Using your home server as a VM host will put more load onto it. The idea of creating one VM per software (eg. Lemmy, a web server, and IRC bouncer, etc...) is a good idea in terms of "replaceability", because you can easily upgrade OS, or restore a service to an earlier point in time, or redistribute resources, etc... The main downside is that you'll add a big overhead to each service resource, as a VM require the full OS to boot. So if you run 5 services in 5 VM, the OS will consume 6 times more RAM, disk and CPU, on idling.

If you can afford that, then do it ! It makes for a better separation of concerns and is definitely easier to maintain on the long run.

Otherwise, you have two solutions. The first one is using containers. It's just like the previous method, except that it won't boot the full OS, and just start your service, using the already running kernel. Many self hosters use this method, so it's well documented and very likely that you'll find a container "package" for any service you might want to run. Note however that it adds another layer of complexity in terms of resource sharing (especially the networking part) that you'll have to understand in order to secure properly.

The last method is hosting your services directly on bare metal. This is the simplest method IMO, but it will get tricky when the software you need is not packaged for your distribution, as you'll need to handle the service script and upgrades manually. This is however the lightest method regarding resource usage, as there is absolutely no overhead to running a service. And depending on the OS you'll be using (in your case Ubuntu as it seems), you will benefit of a containerization like resource control thanks to systemd and cgroups (other mechanisms exists to control resources but this one's fine).

My personal preference goes to the last one (running on bare metal), but that's also because I run OpenBSD as my main OS, which is definitely well suited for this method. I also do not like the docker ecosystem as I think it trades too mhm security for usability (but that's a very personal take).

In any case, happy self hosting my friend !

You want so isolate the things you host from one another (security, making updates easier etc). So if you host just one thing you can do so on the host directly. If you host multiple services you may seek some separation method.

VMs is one method, but it wastes a lot of resources, especially RAM. A more elegant way is containers. Both the docker/podman route as well as the LXC way are quite polular.

I'm not sure there is a consensu here, it's a trade off in many dimensions: security, simplicity, performance, independence, ease of management etc.

Bare metal gives you best performance, good simplicity since there are the least moving parts and the least amount of code deployed. It is fairly easy to manage if you know your distro and service well. You might run into trouble if you want to run non packaged software and compile things on your own.

Containers are pretty efficient and simple to use because a lot of software comes pre-packaged (usually including a basic OS, w/o kernel). They are meant to only have one service per container, which can lead to quite some complexity in inter-connecting them. Security wise, they are less well isolated than VMs between each other and to the host. Operating on their persisted state can be very easy and lightweight. One drawback is that people often don't understand whats happening inside (cf. Reproducibility). The saying goes: As with smoothies, you immeadiately know if you like it (a container) but you don't know what's inside.

VMs are slightly less efficient but have a larger management overhead, ie. You need to configure and upgrade each OS (users, firewall rules etc) on its own, on the other hand you gain flexibility by being able to install different distros or having different versions around. You can also more easily manage the state of the machines (backups, snapshots etc). Security wise, VMs are pretty well isolated from each others and the hypervisor, often the configuration of the machines is the weak point (firewall, sshd or other services).

It does not hurt to create a VM or LXC for it. The overhead is not prohibitive. If things go astray, you can just kill the VM or LXC and restart from sketch. Though setup and management can be an issue as you have to install at least some software for VM management in your media PC.

One thing I think about is isolation. Do you want/need to strongly isolate the software and its data from the host operating system?

I feel like putting it in a VM is probably overkill. I just have everything running in Docker containers and it's pretty good like that.

Personally, I would prefer docker containers as I can move them to a new server or even create backups very easily.

I have my Docker stuff in a VM. Much more reliable than bare metal OS

Imho any form of containerization/virtualization is better than a dedicated machine, for server duties - if only for (in my case) easy backup and rollback in case of human error.

Going with Proxmox VMs atm, and slowly wrapping my head around LXC on a separate "playgound" Proxmox machine.

If you use a full VM you'll lose plenty of performance and I don't think it'll cope really well with domain names. If you really want to go the "keep everything separated" route use container software, like Docker. It'll use the same kernel as the host, so no weird networking rerouting/bridging etc.. I don't have any experience with containers, since I run all of my "homelab" bare metal on a Pi, and with this approach I never faced any issues. Containers could be useful if you were running something unorthodox like Gentoo and you need to run software that won't work on it, even if compiled to run, but it exist as a package on another distro. Then you can just spin up a container for that distro, install the software et voilà, you're ready to go. AFAIK there shouldn't be a package for lemmy on any distro, so just clone the source code and compile it, it should be fairly distro-agnostic. Maybe you could compile it in a container to keep your host clean of compile dependencies, but other than that, there's no real gain. I like to compile stuff, so having a shitload of dependencies already there is pretty handy for me, but for a production system, it's better to keep it clean.