NAME | DESCRIPTION | LOCAL SUBORDINATE DELEGATION | FILES | SEE ALSO | COLOPHON
SUBUID(5) File Formats and Configuration SUBUID(5)
subuid - the configuration for subordinate user ids
Subuid authorizes a user id to map ranges of user ids from its namespace into child namespaces. The delegation of the subordinate uids can be configured via the subid field in /etc/nsswitch.conf file. Only one value can be set as the delegation source. Setting this field to files configures the delegation of uids to /etc/subuid. Setting any other value treats the delegation as a plugin following with a name of the form libsubid_$value.so. If the value or plugin is missing, then the subordinate uid delegation falls back to files. Note, that useradd will only create entries in /etc/subuid if subid delegation is managed via subid files.
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 firstname.lastname@example.org. This page was obtained from the project's upstream Git repository ⟨https://github.com/shadow-maint/shadow⟩ on 2022-12-17. (At that time, the date of the most recent commit that was found in the repository was 2022-12-15.) 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 email@example.com shadow-utils 4.11.1 12/17/2022 SUBUID(5)
Pages that refer to this page: getsubids(1), newuidmap(1), unshare(1), subgid(5), user_namespaces(7), newusers(8), useradd(8), userdel(8), usermod(8)