[MAN] subuid

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SUBUID

Section: File Formats and Conversions (5)
Updated: 03/14/2022
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NAME

subuid - the subordinate uid file  

DESCRIPTION

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.  

FILES

/etc/subuid

Per user subordinate user IDs.

/etc/subuid-

Backup file for /etc/subuid.

 

SEE ALSO

login.defs(5), newgidmap(1), newuidmap(1), newusers(1), subgid(5), useradd(8), userdel(8), usermod(8), user_namespaces(7).

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Index

NAME

DESCRIPTION

FILES

SEE ALSO

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Time: 04:45:55 GMT, September 16, 2022