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MAN page from OpenSuSE shadow-4.6-lp151.2.3.2.x86_64.rpm

SUBGID

Section: File Formats and Conversions (5)
Updated: 04/29/2018
Index 

NAME

subgid - the subordinate gid file 

DESCRIPTION

Each line in/etc/subgidcontains 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 thenewgidmapcommand, 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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