05-16-2012
Quote:
Originally Posted by
little2712
no we cant create so many user with same uid......
This is incorrect. Nothing prevent a single uid to match zero, one, two or any number of usernames. The
useradd command even has the specific switch
-o to allow it.
Quote:
one user have only one uid..
This in incorrect too. A single user(name) can have multiple password entries, although that would be a very poor and confusing practice.
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SUBUID(5) File Formats and Conversions SUBUID(5)
NAME
subuid - the subordinate uid file
DESCRIPTION
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:
o login name or UID
o numerical subordinate user ID
o 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.
FILES
/etc/subuid
Per user subordinate user IDs.
/etc/subuid-
Backup file for /etc/subuid.
SEE ALSO
login.defs(5), newgidmap(1), newuidmap(1), newusers(1), subgid(5), useradd(8), userdel(8), usermod(8), user_namespaces(7).
shadow-utils 4.5 01/25/2018 SUBUID(5)