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

submitted 8 months ago by [email protected] to c/[email protected]

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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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[–] [email protected] 5 points 8 months ago (8 children)

I've used Docker a fair bit over the years because it's a simple line of code I can copy/paste to get a simple web server running.

I ran Home Assistant Supervised in Docker for many years. It was a few lines of code and then I basically had Home Assistant OS running on my Pi without it taking over the whole Pi, meaning I could run other things on it too.

That ended when HA just died one day and I had no clue how to get it running again. I spent a day trying, then just installed HA OS on the Pi instead.

Anyway I now have a Dell Optiplex and Proxmox and I've gone back to Docker. Why? Well I discovered that I could make a Linux VM and install Docker on it, then add the Docker code to install a Portainer client to it, then make that into a template.

Meaning I can clone that template and type the IP address into Portainer and now I have full access to that Docker instance from my original Portainer container. That means I can bang a Docker Compose file into the "Stack" and press go, then tinker with the thing I wanna tinker with. If I get it working it can stay, if I don't then I just delete the VM and I've lost nothing.

Portainer has made Docker way more accessible for me. I love a webui

[–] [email protected] 2 points 8 months ago

I use proxmox to run debian VMs to run docker compose "stacks".
Some VMs are dedicated to an entire servicecs docker compose stack.
Some VMs are for a docker compose of a bunch of different services.
Some services are run across multiple nodes with HA VIPs and all that jazz for "guaranteed" uptime.
I see the guest VM as a collection, but there is only ever 1 compose file per host.
Has a bit of overhead, but makes it really easy to reason about, separate VLANs and firewall rules etc

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