subuid(5) the subordinate uid file


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

• 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.



Per user subordinate user IDs.


Backup file for /etc/subuid.