FR: Read /etc/docker/config.json in addition to ~/.docker/config.json

[ChristianTackeGSI]

As a sysadmin, I would like to set some options globally for all users.

So it would be good, if the logic reading ~/.docker/config.json would also read /etc/docker/config.json and merge the results.

When it comes to precedences, I think, the user's config should override the system config.

My major use case are proxies (see #93). Asking every user to configure them by hand is not optimal.

[thaJeztah]

Thanks for your proposal. I agree that the configuration should be more "modular", so allow setting (system-wide) defaults, but also allowing overrides (per user and/or even per project (I proposed a .docker directory in some conversations that could be included in your project and could contain (all) docker-related files) or context; see #1621)

We'll likely have to consider following https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html (for Linux at least; macOS and Windows t.b.d. on paths/priority)

[ChristianTackeGSI]

+1 for XDG Base Dir in general! (uncluttering $HOME)

Following XDG Basedir fully would introduce something like /etc/xdg/docker/, while we already have /etc/docker/ (for daemon.json and key.json). So maybe the search path for config.json should include both?

[RobertIndie]

But how do we handle the case of changing and saving configuration files? Like using docker context use, docker context rm, docker login or docker logout.

[ChristianTackeGSI]

docker login writes to the user's local ~/.docker/config.json. (Or in XDG world to ~/.config/docker/config.json)

The files in /etc/ should be read before the user's ones, so that the settings of the user overrides the system's one.
The idea is, that the system administrator wants to set sane defaults for things.

[RobertIndie]

I'm interested to work on this.

[fede843]

Is there any update on this one?

[darkhelmet]

I just fought with this for a few hours today because I thought "obviously I should be able to configure a global /etc/docker/config.json"