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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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How bad/terrible is this docker image? (Click here to see it.) (hub.docker.com)

submitted 1 year ago by GustavoM@lemmy.world to c/linux@lemmy.ml

9 comments fedilink hide all child comments

Title. Just wondering if I did something bad/terrible with it. Link is @ title. Check the image tag @ its repo to see how it was built. And before someone asks... the Docker lemmy community is really dead so I had to resort to you guys. Sorry, I guess.

And thanks in advance.

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[–] GustavoM@lemmy.world 2 points 1 year ago* (last edited 1 year ago) (4 children)

copying in key elements from the host machine

Not from the host machine, but from the official nginx image ( nginx:mainline-alpine3.18-slim ). And what it (basically) does is separate the essential commands/files inside a scratch image and gives every command a custom username tag.

Still, I appreciate your input.

[–] lidstah@lemmy.sdf.org 2 points 1 year ago* (last edited 1 year ago) (3 children)

A bit late but you might want to have a look at docker multi-stage build documentation which does exactly what you did (start from a base image then copying stuff from it to your own image), something like that:

FROM someimage:sometag AS build
[do stuff]
FROM minimalimage:someothertag
COPY --from=build /some/file /some/other/file
[and so on]
USER somebody
CMD ["/path/somecommand"]

Which will simplify building new images against newer "build" image newer tags easier.

btw, you were quite creative on this one! You also might want to have a look at the distroless image, the goal being to only have the bare minimum to run your application in the image: your executable and its runtime dependencies.

[–] GustavoM@lemmy.world 2 points 1 year ago (2 children)

Now you've confused me a little bit -- is there any difference between a scratch and a distroless image? Aren't they (technically) the same thing?

That aside, thank you for your input and compliment.

[–] lidstah@lemmy.sdf.org 2 points 1 year ago (1 children)

You're welcome! scratch and distroless are indeed basically the same thing, scratch being the 'official' docker minimal image while distroless is from google - as I'm more a Kubernetes user (at home and at work) than a Docker user, I tend to think about distroless first :) - my apologies if my comment was a bit confusing on this matter.

By the way, have fun experimenting with docker (or podman), it's interesting, widely used both in selfhosting and professional environments, and it's a great learning experience - and a good way to pass time during these long winter evenings :)

[–] GustavoM@lemmy.world 2 points 1 year ago

Oh, I see. Thanks for clarifying. And I've got to admit that "dockerizing" everything is a fun process indeed. :P