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You are here: manpages





SUBGID

Section: File Formats and Conversions (5)
Updated: 05/17/2017
Index Return to Main Contents
 

NAME

subgid - the subordinate gid file  

DESCRIPTION

Each line in /etc/subgid contains a user name and a range of subordinate group ids that user is allowed to use. This is specified with three fields delimited by colons (lq:rq). These fields are:

* login name or UID

* numerical subordinate group ID

* numerical subordinate group ID count

This file specifies the group IDs that ordinary users can use, with the newgidmap command, to configure gid 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/subgid, 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/subgid

Per user subordinate group IDs.

/etc/subgid-

Backup file for /etc/subgid.
 

SEE ALSO

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


 

Index

NAME
DESCRIPTION
FILES
SEE ALSO


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