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What's the deal with Docker? (lemmy.zip)

submitted 2 years ago by AlexPewMaster@lemmy.zip to c/selfhosted@lemmy.world

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I never understood how to use Docker, what makes it so special? I would really like to use it on my Rapsberry Pi 3 Model B+ to ease the setup process of selfhosting different things.

I'm currently running these things without Docker:

Mumble server with a Discord bridge and a music bot
Maubot, a plugin-based Matrix bot
FTP server
Two Discord Music bots

All of these things are running as systemd services in the background. Should I change this? A lot of the things I'm hosting offer Docker images.

It would also be great if someone could give me a quick-start guide for Docker. Thanks in advance!

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[–] matcha_addict@lemy.lol 33 points 2 years ago* (last edited 2 years ago)

This blog post explains it well:

https://cosmicbyt.es/posts/demistifying-containers-part-1/

Essentially, containers are means of creating environments in which you can run software, and those environments are:

isolated, which makes it a very controlled environment. Much harder to run into errors
reproducible: we have tools that reproduce the same container from an image file
easy to distribute: just have the container image.
little to no compromises on performance (at least on Linux)

It is essentially a way for you to run a program without having to worry how to set up the environment, why it didn't work as expected, what dependencies you're missing, etc.