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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 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-11-08.) 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 12/18/2020 SUBUID(5)
Pages that refer to this page: newuidmap(1), subgid(5), user_namespaces(7), newusers(8), useradd(8), userdel(8), usermod(8)
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