this post was submitted on 10 Jan 2024
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Why docker (feddit.it)
submitted 10 months ago by [email protected] to c/[email protected]
70 comments fedilink hide all child comments
 

Hi! Question in the title.

I get that its super easy to setup. But its really worthwhile to have something that:

  • runs everything as root (not many well built images with proper useranagement it seems)
  • you cannot really know which stuff is in the images: you must trust who built it
  • lots of mess in the system (mounts, fake networks, rules...)

I always host on bare metal when I can, but sometimes (immich, I look at you!) Seems almost impossible.

I get docker in a work environment, but on self hosted? Is it really worth while? I would like to hear your opinions fellow hosters.

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[–] [email protected] 10 points 10 months ago (1 children)

To answer each question:

  • You can run rootless containers but, importantly, you don't need to run Docker as root. Should the unthinkable happen, and someone "breaks out" of docker jail, they'll only be running in the context of the user running the docker daemon on the physical host.
  • True but, in my experience, most docker images are open source and have git repos - you can freely download the repo, inspect the build files, and build your own. I do this for some images I feel I want 100% control of, and have my own local Docker repo server to hold them.
  • It's the opposite - you don't really need to care about docker networks, unless you have an explicit need to contain a given container's traffic to it's own local net, and bind mounts are just maps to physical folders/files on the host system, with the added benefit of mounting read-only where required.

I run containers on top of containers - Proxmox cluster, with a Linux container (CT) for each service. Most of those CTs are simply a Debian image I've created, running Docker and a couple of other bits. The services then sit inside Docker (usually) on each CT.

It's not messy at all. I use Portainer to manage all my Docker services, and Proxmox to manage the hosts themselves.

Why? I like to play.

Proxmox gives me full separation of each service - each one has its own CT. Think of that as me running dozens of Raspberry Pis, without the headache of managing all that hardware. Docker gives me complete portability and recoverability. I can move services around quite easily, and can update/rollback with ease.

Finally, the combination of the two gives me a huge advantage over bare metal for rapid prototyping.

Let's say there's a new contender that competes with Immich. I have Immich hosted on a CT, using Docker, and hiding behind Nginx Proxy Manager (also on a CT).

I can spin up a Proxmox CT from my own template, use my Ansible playbook to provision Docker and all the other bits, load it in my Portainer management platform, and spin up the latest and greatest Immich competitor, all within mere minutes. Like, literally 10 minutes max.

I have a play with the competitor for a bit. If I don't like it, I just delete the CT and move on. If I do, I can point my photos... hostname (via Nginx Proxy Manager) to the new service and start using it full-time. Importantly, I can still keep my original Immich CT in place - maybe shutdown, maybe not - just in case I discover something I don't like about the new kid on the block.

[–] [email protected] 2 points 10 months ago* (last edited 10 months ago) (1 children)

Should the unthinkable happen, and someone "breaks out" of docker jail, they'll only be running in the context of the user running the docker daemon on the physical host.

There is no daemon in rootless mode. Instead of a daemon running containers in client/server mode you have regular user processes running containers using fork/exec. Not running as root is part and parcel of this approach and it's a good thing, but the main motivator was not "what if someone breaks out of the container" (which doesn't necessarily mean they'd get all the privileges of the running user on the host and anyway it would require a kernel exploit, which is a pretty tall order). There are many benefits to making running containers as easy as running any kind of process on a Linux host. And it also enabled some cool new features like the ability to run only partial layers of a container, or nested containers.

[–] [email protected] 2 points 10 months ago

Yep, all true. I was oversimplifying in my explanation, but you're right. There's a lot more to it than what I wrote - I was more relating docker to what we used to do with chroot jails.