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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).

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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 to c/[email protected]

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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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 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 2 points 1 year ago (1 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.

[–] [email protected] 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 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