this post was submitted on 13 Dec 2023
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Should I move to Docker? (lemmy.ca)
submitted 11 months ago by GreatBlueHeron@lemmy.ca to c/selfhosted@lemmy.world
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I'm a retired Unix admin. It was my job from the early '90s until the mid '10s. I've kept somewhat current ever since by running various machines at home. So far I've managed to avoid using Docker at home even though I have a decent understanding of how it works - I stopped being a sysadmin in the mid '10s, I still worked for a technology company and did plenty of "interesting" reading and training.

It seems that more and more stuff that I want to run at home is being delivered as Docker-first and I have to really go out of my way to find a non-Docker install.

I'm thinking it's no longer a fad and I should invest some time getting comfortable with it?

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[–] onlinepersona@programming.dev 6 points 11 months ago (34 children)

Why wouldn't you want to use containers? I'm curious. What do you use now? Ansible? Puppet? Chef?

[–] Dyskolos@lemmy.zip 0 points 11 months ago (30 children)

Not OP, but, seriously asking, why should I? I usually still use VMs for every app i need. Much more work I assume, but besides saving time (and some overhead and mayve performance) what would I gain from docker or other containers?

[–] MostlyGibberish@lemm.ee 7 points 11 months ago (1 children)

One of the things I like about containers is how central the IaC methodology is. There are certainly tools to codify VMs, but with Docker, right out of the gate, you'll be defining your containers through a Dockerfile, or docker-compose.yml, or whatever other orchestration platform. With a VM, I'm always tempted to just make on the fly config changes directly on the box, since it's so heavy to rebuild them, but with containers, I'm more driven to properly update the container definition and then rebuild the container. Because of that, you have an inherent backup that you can easily push to a remote git server or something similar. Maybe that's not as much of a benefit if you have a good system already, but containers make it easier imo.

[–] Dyskolos@lemmy.zip 1 points 11 months ago (1 children)

Actually only tried a docker container once tbh. Haven't put much time into it and was kinda forced to do. So, if I got you right, I do define the container with like nic-setup or ip or ram/cpu/usage and that's it? And the configuration of the app in the container? is that IN the container or applied "onto it" for easy rebuild-purpose? Right now I just have a ton of (big) backups of all VMs. If I screw up, I'm going back to this morning. Takes like 2 minutes tops. Would I even see a benefit of docker? besides saving much overhead of cours.

[–] felbane@lemmy.world 2 points 11 months ago* (last edited 11 months ago) (1 children)

You don't actually have to care about defining IP, cpu/ram reservations, etc. Your docker-compose file just defines the applications you want and a port mapping or two, and that's it.

Example:

***
version: "2.1"
services:
  adguardhome-sync:
    image: lscr.io/linuxserver/adguardhome-sync:latest
    container_name: adguardhome-sync
    environment:
      - CONFIGFILE=/config/adguardhome-sync.yaml
    volumes:
      - /path/to/my/configs/adguardhome-sync:/config
    ports:
      - 8080:8080
    restart:
      - unless-stopped

That's it, you run docker-compose up and the container starts, reads your config from your config folder, and exposes port 8080 to the rest of your network.

[–] Dyskolos@lemmy.zip 1 points 11 months ago (1 children)

Oh... But that means I need another server with a reverse-proxy to actually reach it by domain/ip? Luckily caddy already runs fine 😊

Thanks man!

[–] felbane@lemmy.world 2 points 11 months ago (1 children)

Most people set up a reverse proxy, yes, but it's not strictly necessary. You could certainly change the port mapping to 8080:443 and expose the application port directly that way, but then you'd obviously have to jump through some extra hoops for certificates, etc.

Caddy is a great solution (and there's even a container image for it 😉)

[–] Dyskolos@lemmy.zip 1 points 11 months ago

Lol...nah i somehow prefer at least caddy non-containerized. Many domains and ports, i think that would not work great in a container with the certificates (which i also need to manually copy regularly to some apps). But what do i know 😁

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