NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON |
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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 2018-10-29. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2018-10-27.) If you discover any rendering problems in
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of the original manual page), send a mail to man-pages@man7.org
shadow-utils 4.6 10/29/2018 SUBUID(5)
Pages that refer to this page: newuidmap(1), subgid(5), user_namespaces(7), newusers(8), useradd(8), userdel(8), usermod(8)