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subgid(5) [linux man page]

SUBGID(5)                                                  File Formats and Conversions                                                  SUBGID(5)

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 (":"). These fields are: o login name or UID o numerical subordinate group ID o 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). shadow-utils 4.5 01/25/2018 SUBGID(5)

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SUBGID(5)						   File Formats and Conversions 						 SUBGID(5)

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 (":"). These fields are: o login name or UID o numerical subordinate group ID o 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). shadow-utils 4.5 01/25/2018 SUBGID(5)

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