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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 ⟨http://pkg-shadow.alioth.debian.org/⟩. If
you have a bug report for this manual page, see
⟨http://pkg-shadow.alioth.debian.org/getinvolved.php⟩. This page was
obtained from the project's upstream Git repository
⟨git://anonscm.debian.org/git/pkg-shadow/shadow.git⟩ on 2017-07-05.
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 4.4 07/05/2017 SUBUID(5)
Pages that refer to this page: newuidmap(1), subgid(5), user_namespaces(7), newusers(8), useradd(8), userdel(8), usermod(8)