конфигурация для идентификаторов подчиненных групп (the configuration for subordinate group ids)
Имя (Name)
subgid - the configuration for subordinate group ids
Описание (Description)
Subgid authorizes a group id to map ranges of group ids from its
namespace into child namespaces.
The delegation of the subordinate gids can be configured via the
subid field in /etc/nsswitch.conf file. Only one value can be set
as the delegation source. Setting this field to files configures
the delegation of gids to /etc/subgid. Setting any other value
treats the delegation as a plugin following with a name of the
form libsubid_$value.so. If the value or plugin is missing, then
the subordinate gid delegation falls back to files.
Note, that groupadd will only create entries in /etc/subgid if
subid delegation is managed via subid files.
LOCAL SUBORDINATE DELEGATION
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:
• 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.
Файлы (Files)
/etc/subgid
Per user subordinate group IDs.
/etc/subgid-
Backup file for /etc/subgid.
Смотри также (See also)
login.defs(5), newgidmap(1), newuidmap(1), newusers(8),
subuid(5), useradd(8), userdel(8), usermod(8),
user_namespaces(7).
