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NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON |
SUBUID(5) File Formats and Conversions SUBUID(5)
subuid - the subordinate uid file
Each line in /etc/subuid contains a user name and a range of
subordinate user ids that user is allowed to use. This is specified
with three fields delimited by colons (“:”). These fields are:
· login name or UID
· numerical subordinate user ID
· numerical subordinate user ID count
This file specifies the user IDs that ordinary users can use, with
the newuidmap command, to configure uid mapping in a user namespace.
Multiple ranges may be specified per user.
When large number of entries (10000-100000 or more) are defined in
/etc/subuid, parsing performance penalty will become noticeable. In
this case it is recommended to use UIDs instead of login names.
Benchmarks have shown speed-ups up to 20x.
/etc/subuid
Per user subordinate user IDs.
/etc/subuid-
Backup file for /etc/subuid.
login.defs(5), newgidmap(1), newuidmap(1), newusers(1), subgid(5),
useradd(8), userdel(8), usermod(8), user_namespaces(7).
This page is part of the shadow-utils (utilities for managing
accounts and shadow password files) project. Information about the
project can be found at ⟨https://github.com/shadow-maint/shadow⟩. If
you have a bug report for this manual page, send it to
pkg-shadow-devel@alioth-lists.debian.net. This page was obtained
from the project's upstream Git repository
⟨https://github.com/shadow-maint/shadow⟩ on 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-13.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
shadow-utils 4.8.1 08/13/2020 SUBUID(5)
Pages that refer to this page: newuidmap(1) , subgid(5) , user_namespaces(7) , newusers(8) , useradd(8) , userdel(8) , usermod(8)