User ID Valid Range

Posted on Edited on In

From the CloudPak certification requirments, the uid for non-root user in container should be set in a higher range. We change it from 1000 to 100321000 but the image build got stuck and failed.

The reason is there is a range for uid number, it’s described in /etc/login.defs file (you can edit this file).

1
2
3
4
cat /etc/login.defs | grep -i UID

UID_MIN                  1000
UID_MAX                 60000

So if you create a user by useradd without specify user id explicitly, its uid will start from 1000. Also when change the uid by usermod -u <new uid> <user name>, you need to follow the limitation.

The gid has the same restriction:

1
2
3
4
cat /etc/login.defs | grep -i GID

GID_MIN                  1000
GID_MAX                 60000