конфигурация для подчиненных идентификаторов пользователей (the configuration for subordinate user ids)
Имя (Name)
subuid - the configuration for subordinate user ids
Описание (Description)
Subuid authorizes a user id to map ranges of user ids from its
namespace into child namespaces.
The delegation of the subordinate uids 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 uids to /etc/subuid. 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 uid delegation falls back to files.
Note, that useradd will only create entries in /etc/subuid if
subid delegation is managed via subid files.
LOCAL SUBORDINATE DELEGATION
Each line in /etc/subuid contains a user name and a range of
subordinate user 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 user ID
• numerical subordinate user ID count
This file specifies the user IDs that ordinary users can use,
with the newuidmap command, to configure uid 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/subuid, 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/subuid
Per user subordinate user IDs.
/etc/subuid-
Backup file for /etc/subuid.
Смотри также (See also)
login.defs(5), newgidmap(1), newuidmap(1), newusers(1),
subgid(5), useradd(8), userdel(8), usermod(8),
user_namespaces(7).
