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Should I move to Docker? (lemmy.ca)
submitted 11 months ago by [email protected] to c/[email protected]
20 comments fedilink hide all child comments
 

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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[–] [email protected] 0 points 11 months ago* (last edited 11 months ago) (1 children)

Hi, also used to be a sysadmin and I like things that are simple and work. I like Docker.

Besides what you already noticed (that most software can be found packaged for Docker) here are some other advantages:

  • It's much lighter on resources and efficient than virtual machines.
  • It provides a way to automate installs (docker compose) that's (much) easier to get started with than things like Ansible.
  • It provides a clear separation between configuration, runtime, and persistent data and forces you to get organized.
  • You can group related services.
  • You can control interdependencies, privileges, shared access to resources etc.
  • You can define simple or complex virtual networking topologies between containers as you like.
  • It adds extra security (for whatever that's worth to you).

A brief description of my own setup, for ideas, feel free to ask questions:

  • Router running OpenWRT + server in a regular PC.
  • Server is 32 MB of RAM (bit overkill for now, black Friday upgrade, ran with 4 GB for years), Intel CPU with embedded GPU, OS on M.2 SSD, 8 HDD bays in Linux software RAID (MD).
  • OS is Debian stable barebones, only Docker, SSH and NFS are installed on the host directly. Tip: use whatever Linux distro you know and like best.
  • Docker is installed from their own repository, not from Debian's.
  • Everything else runs from docker containers, including things like CUPS or Samba.
  • I define all containers with compose, and map all persistent data to host storage. This way if I lose a container or even the whole OS I just re-provision from compose definitions and pick up right where I left off. In fact destroying and recreating containers cleanly is common practice with docker.

Learning docker and compose is not very hard esp. if you were on the job.

If you have specific requirements eg. storage, exposing services over internet etc. please ask.

Note: don't start with Podman or rootless Docker, start with regular Docker. It will be 10x easier. You can transition to the others later if you want.

[–] [email protected] 1 points 7 months ago (1 children)

It seems like docker would be heavy on resources since it installs & runs everything (mysql, nginx, etc.) numerous times (once for each container), instead of once globally. Is that wrong?

[–] [email protected] 2 points 7 months ago

There's nothing stopping you from using a single instance of those and only adding databases and config. The configs that come with projects set them up individually because they need to offer full examples but those configs are only meant as a guideline.

Also keep in mind that the overhead of just running multiple instances isn't very big. The resources are consumed when you start having connections and using CPU and storing data and so on, and those are going to be the same no matter how many instances you have.