Another reason to love Linux (beehaw.org)

submitted 2 days ago by [email protected] to c/[email protected]

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Application optimization reduces disk usage and reclaims space. 🙂

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[-] [email protected] 1 points 1 day ago* (last edited 1 day ago)

Hold up, nix added containerization? How did I miss that? I will have another look now!

Also, you're right. For small quick scripts docker can be a hassle. Nowadays though I add building a docker image as part of my project's build/compilation process. The main reason I do this is so that I can work with whatever machine I happen to be on, then just copy paste the app to whatever machine I want it on. No extra config or even a look at the environment required. Just install docker and forget about the rest

update: installing docker on nixos (on a vm) with a nix package failed, not sure why. Perhaps some dependencies were no longer available?

update: nix is is available as a docker image. I'm running it now, we shall see how it goes

[-] [email protected] 1 points 22 hours ago* (last edited 22 hours ago)

Hold up, nix added containerization? How did I miss that? I will have another look now!

Nix is containerization. Here is firing up a temporary little container with a new python version and then throwing it away once I'm done with it (although you can also do this with more complicated setups, this is just showing doing it with one thing only):

[hap@glimmer:/proc/69235/fd]$ python --version
Python 3.12.8

[hap@glimmer:/proc/69235/fd]$ nix-shell -p python39
this path will be fetched (27.46 MiB download, 80.28 MiB unpacked):
  /nix/store/jrq27pp6plnpx0iyvr04f4apghwc57sz-python3-3.9.21
copying path '/nix/store/jrq27pp6plnpx0iyvr04f4apghwc57sz-python3-3.9.21' from 'https://cache.nixos.org/'...

[nix-shell:~]$ python --version
Python 3.9.21

[nix-shell:~]$ exit
exit

[hap@glimmer:/proc/69235/fd]$ python --version
Python 3.12.8

The whole "system" you get when moving from Nix to NixOS is basically just a composition of a whole bunch of individual packages like python39 was, in one big container that is "the system." But you can also fire up temporary containers trivially for particular things. I have a couple of tools with source in ~/src which, whenever I change the source, nix-os rebuild will automatically fire up a little container to rebuild them in (with their build dependencies which don't have to be around cluttering up my main system). If it works, it'll deploy the completed product into my main system image for me, but if it doesn't then nothing will have changed (and either way it throws away the container it used to attempt the build in).

Each config change spawns a new container for the main system OS image ("generation"), but you can roll back to one of the earlier generations (which are, from a functional perspective, still around) if you want or if you broke something.

And so on. It's very nice.

[-] [email protected] 1 points 11 hours ago

Aw, meh. From what I saw it's more like a jail, there's no imaging the containers

[-] [email protected] 1 points 1 hour ago

Yes because that is a wrong and clunky way to do it lol.

If you really wanted to, you could use dockerTools.BuildImage to create an "imaged" version of the container you made, or you could send around the flake.nix and flake.lock files exactly as someone would send around Dockerfiles. That stuff is usually just not necessary though, because it's replaced with just a better approach (for the average-end-user case where you don't need large numbers of Docker containers that you can deploy quickly at scale) that accomplishes the same thing.

I feel like I'm not going to convince you of this though. Have fun with Docker, I guess.

this post was submitted on 19 Jun 2025

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