Explain Like I'm Five

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ELI5: Docker containers (feddit.org)

submitted 1 week ago by [email protected] to c/explainlikeimfive

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I can't seem to wrap my head around (Docker) containers and especially their maintenance.
As I understand it, containers contain a stripped-down OS that shares some resources with the host?
Or is it more like a closed-off part of the file system?

Anyway, when I have several containers running on a host system,
Do I need to keep them all updated separately? If so, how?
Or is it enough to update the host system, and not worry about the containers?

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[–] [email protected] 5 points 1 week ago* (last edited 1 week ago) (4 children)

I also dont get how to update docker containers and where to save config files. The idea is that the containers are stateless so they can be recreated whenever you like.

But there are no automatic updates?? You need a random "watchtower" container that does that.

Also, they are supposed to give easy security, buf NGINX runs as root? There is a rootless variant

[–] roofuskit 5 points 1 week ago

No automatic updates is a feature not a bug.

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