subuid man page on Kali

subuid man page on Kali

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SUBUID(5)		 File Formats and Conversions		     SUBUID(5)

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).

shadow-utils 4.5		  09/27/2017			     SUBUID(5)

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