bug#55358: docker containers stopped when doing guix install or guix shell

[Remco van 't Veer]

Hi Maxim and Zimoun,

2023/02/09 13:26, Remco van 't Veer:

> I think I know what is causing the issue.  Both the "standard" mysql and
> postgres containers use user-id 999 to run the database service (this
> seems like a common practice because the redis container is configured
> similarly).  That user-id is also configured as guixbuilder01 so I guess
> the guix daemon is killing those when processes when it finishes doing
> builds.

I found a solution / workaround for this problem by using
"userns-remap".  This feature allows the remapping of uids and guids to
different ranges.  I tried it by hacking the required files into my
etc-directory and it works; guix no long kills my database containers.

I'd like to add this feature to docker-service-type having a new
configuration option named enable-userns-remap? which introduces a new
user and group (both named dockremap) to do the remapping by adding some
configurable number to the uids and guids of the running container.  In
/etc/subuid and /etc/subgid it would look like:

  dockremap:100000:65536

See https://docs.docker.com/engine/security/userns-remap/ for
documentation about this.

WDYT?

Cheers,
Remco


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https://debbugs.gnu.org/cgi/bugreport.cgi?bug=55358