Apple Computer Tablet x User Manual download pdf (Page 38)

38 Chapter 2

Managing UIDs

The UID is a critical element in ensuring users have full access to the directories and ﬁles

they create as well as to their home directories.

Most of the time, individual users should have unique UIDs. Assigning the same UID to

different user records is risky unless you have a speciﬁc reason for doing so, such as to

support a new short name as described above. Two users with the same UID have identical

directory and ﬁle access privileges.

Devise a UID strategy that will minimize the likelihood of different users having the same

UID. You can, for example, reserve a range of UIDs for use in each shared domain.

Remember the following points:

m The UID 0 is reserved for the root user.

m The maximum UID is 2,147,483,647.

m UIDs below 100 are reserved for system use.

m Users created in the Users pane of System Preferences are automatically assigned UIDs

starting with 500. You can change these UIDs using NetInfo Manager.

m Users created in the Users & Groups module of Server Admin are automatically assigned

UIDs starting with 100. These UIDs can be changed in the Users & Groups module.

Once UIDs have been assigned and users start creating ﬁles and directories throughout a

network, you shouldn’t change UIDs. So ensure that from the beginning you have a plan for

UID management.

Setting Up Home Directories

Identify the computers on which you want user home directories to reside. You may want to

store home directories for users with last names from A to F on one computer, G to J on

another, and so on. Whatever strategy you pick, decide on one before creating a lot of users.

You can move home directories, but if you do, you may need to change a large number of

user and share point records.

Once you have decided how many computers you want to use for home directories, plan the

domain name or IP address of each computer. Also determine the names and any share

points on the computer that will be used for home directories. You’ll need this information

to set up home directories when you deﬁne users with the Users & Groups module of Server

Admin on a Mac OS X Server.

Now you are ready to deﬁne users, either individually or by importing them. Even if the

computers on which the user home directories will reside will not be available for a while,

you can begin the process of setting up users.

Refer to the Mac OS X Server Administrator’s Guide for information about using Server

Admin to deﬁne users, home directories, and share points.

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Apple Computer Tablet x User Manual Page 38