subgid - the configuration for subordinate group ids
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.
login.defs(5), newgidmap(1), newuidmap(1), newusers(8), subuid(5), useradd(8), userdel(8), usermod(8), user_namespaces(7).