Hello everyone,
TL;DR;
a fresh Fedora installation won't have /etc/subuid and /etc/subgid
Docker user namespace implementation require those files to be present - otherwise it fails
Docker user ns relies on two files /etc/{subuid,subgid} to be on the rootfs in order to
gather information about remapped root(s). AFAIK other distros ship those files (empty by default IIRC).
The only exception is Fedora (as also stated in their official docs at [1]).
Is there any particular issue|reason Fedora doesn't ship those two files?
[1] https://github.com/docker/docker/blob/master/docs/reference/commandline/daemon.md#starting-the-daemon-with-user-namespaces-enabled
Thx,
Antonio (runcom) Murdaca
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