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May 25th. 2007:
April, 26th. 2006:
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SUBGID
Section: File Formats and Conversions (5) Updated: 05/17/2017 Index
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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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