MAN page from OpenSuSE shadow-4.6-lp220.127.116.11.x86_64.rpm
Section: File Formats and Conversions (5)
subgid - the subordinate gid file
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.
- Per user subordinate group IDs.
- Backup file for /etc/subgid.
- SEE ALSO
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