Dockers documentation is actually pretty good, I’d recommend taking a look at it because it’s written really well and can be used as a decent primer on learning to read documentation.

I would recommend learning docker / containerization. For your use case you likely won’t see a big benefit HOWEVER it is a good technology to know.

As far as the “why” you’d use it there are too many to list but for your use case the why I’d argue is “just so you know how to do it” and you’ll come up with your own why along the way.

Simplest why beyond “it’s a good technology to know” is that updating an app is as simple as pulling a new container and relaunching it.

How’s the Pi 3? I was considering the idea of getting one to avoid the crazy prices for newer models

Docker of one version of software that uses Linux containers to encapsulate software and that software's dependencies, while limiting that software's access to the underlying OS. It's chroot, but for more of the system. It can make running software that has a lot of moving parts and dependencies easier. It can also improve your security running that software.

For how-tos, watch one of the 875,936 YouTube tutorials, or read one of the 3 million text tutorials. Or ask ChatGPT, if you really need hand-holding.

Docker is amazing but not needed. You can compare it to a simpler VM. You can take a docker and run it on any machine. You have an environment that is separate from your host and you and the container can only access it via defined points (volumes and ports).

Imagine you need to run a 2nd Mumble Server. I never set on up but its often that a 2nd instance is not that easy. With docker its easy. The only difference is that you need to use different ports, when you have only one network access or you use a reverse proxy. You can create a 2nd instance to test stuff, without interrupting your productive system. Its a security benefit, because its isolated to some degree and you can remove one easily.

I started using it with MSSQL Server, because I hated how invasive it is on a windows machine, especially I just needed it temporarily to do stuff with it. I'm not a microsoft admin and I know that Servers from Microsoft are a different level. Docker allowed me to start and stop it and remove it very easily. After that I started using it for a lot of and brought my NAS on the next level.

Also one thing worth mentioning are Linux Containerx (LXC). They are in Proxmox but I have less knowledge. It feels more like a full VM than docker but uses less resources. This is the reason why containers in general are more popular. They are less resource hungry than a full VM but have some benefits than running everything on one machine. LXC feels more like a full system, than docker. With docker you rarely get into the system. You may execute some commands, like a create user command or a one time job but don't access it via a shell from the inside (its possible). LXC on the other hand, you use the shell.

Vs. LXD?

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

9 acronyms in this thread; the most compressed thread commented on today has 15 acronyms.

[Thread #592 for this sub, first seen 11th Mar 2024, 17:25] [FAQ] [Full list] [Contact] [Source code]

Recent video that explains Docker very well: https://www.youtube.com/watch?v=rIrNIzy6U_g

The thing with Docker is that people don't want to learn how to use Linux and are buying into an overhyped solution that makes their life easier without understanding the long term consequences. Most of the pro-Docker arguments go around security and that's mostly BS because 1) systemd can provide as much isolation a docker containers and 2) there are other container solutions that are at least as safe as Docker and nobody cares about them.

Companies such as Microsoft and GitHub are all about re-creating and reconfiguring the way people develop software so everyone will be hostage of their platforms. We see this in everything now Docker/DockerHub/Kubernetes and GitHub actions were the first sign of this cancer. We now have a generation that doesn’t understand the basic of their tech stack, about networking, about DNS, about how to deploy a simple thing into a server that doesn’t use some Docker BS or isn’t a 3rd party cloud xyz deploy-from-github service.

Before anyone comments that Docker isn’t totally proprietary and there’s Podman consider the following: It doesn’t really matter if there are truly open-source and open ecosystems of containerization technologies. In the end people/companies will pick the proprietary / closed option just because “it’s easier to use” or some other specific thing that will be good on the short term and very bad on the long term.

Docker may make development and deployment very easy and lowered the bar for newcomers have the dark side of being designed to reconfigure and envelope the way development gets done so someone can profit from it. That is sad and above all set dangerous precedents and creates generations of engineers and developers that don’t have truly open tools like we did. There's LOT of money into transitioning everyone to the "deploy-from-github-to-cloud-x-with-hooks" model so those companies will keep pushing for it.

Note that technologies such as Docker keep commoditizing development - it’s a negative feedback loop that never ends. Yes I say commoditizing development because if you look at it those techs only make it easier for the entry level developer and companies instead of hiring developers for their knowledge and ability to develop they’re just hiring “cheap monkeys” that are able to configure those technologies and cloud platforms to deliver something. At the end of the they the business of those cloud companies is transforming developer knowledge into products/services that companies can buy with a click.