Linux containers in 500 lines of code (2016) | Hacker News Reader

Linux containers in 500 lines of code (2016)

blog.lizzie.io

250 pointsgraderjs27 comments

slightly related: docker clone in 120 lines of bash - https://github.com/p8952/bocker/blob/master/bocker

This is so clever. I love the use of comments and parsing the source file for those comments as a way of displaying help.

is Docker married to btrfs?

Docker defaults to overlay2, but supports btrfs and others: https://docs.docker.com/storage/storagedriver/select-storage...

"Bocker" uses btrfs only.

I wish Docker had been kept as simple as possible. A Bocker that uses overlay2 could potentially be a Docker-like MVP.

I think they're going for the minimal line count by in lining the docstrings. In some of my own scripts, I've lifted an idea that I saw in the wild where your Usage header and function docstrings are just prefixed with '#/', a more aesthetic and equally unlikely string (which also looks good in blocks, so it could even be restricted to newlines that just are comments, letting the line count breath a but and removing any worry of accidentally using that sequence in code). Our help function would then just 'grep w/e $BASH_SOURCE | cut w/e'.

It's not really a clone, it's a tiny subset of Docker daemon functionality. It's missing huge things like building images from Dockerfiles, pushing to registries, networks, volumes, port forwarding, integration w/ containerd, health checking, event bus, and on and on.

My dreams of one day reading a full clone of docker in 120 lines or less are shattered. Maybe next time.

How does three lines of Perl sound?

Like a piano falling down the stairs.

Previous discussion (Feb 2020): https://news.ycombinator.com/item?id=22232705

A good presentation along similar lines, incidentally by another Liz:

https://youtu.be/8fi7uSYlOdc

Cool, can we support Container Runtime Interface (CRI) with few more lines of code?

This will be a fun read, thanks!

If you'd prefer to see the same ideas in video form, Liz Rice gave a pretty good prsentation on this same topic in 2018: https://www.youtube.com/watch?v=8fi7uSYlOdc

I have to freshen up my C skills. I found this interesting to upvoting so I can pick your brain later :)

You can "favorite" posts also.

I love org mode documents as much as the next guy, but they really need better css for mobile on html export

Honestly thats something that I feel like is both lacking documentation and good, ready to use css templates. Had a bit of a pain a while ago making a stylesheet for my org exports

Have you tried water.css? It’s very nice https://watercss.kognise.dev/

I wish the web had more simple CSS like this.

I use it for some of my personal sites. Partly because I’m not incredibly good at typography/layout and partly to save time.

Makes me feel like there’s a potential for a CSS Zen Garden spin off: a collection of small CSS files that make basic HTML look nice. No classes, just styling on raw elements.

Indeed. That would be really awesome.

Oh, I discovered this too! I think it's called classless CSS and is actually a thing.

Here's a repo: https://github.com/dbohdan/classless-css

Would actually look better with no CSS at all

Might benefit from a (2016) tag. Date gotten from the homepage: https://blog.lizzie.io/

Oops, thought I'd added that. Thanks. Fixed.

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