TAILIEUCHUNG - Networking: A Beginner’s Guide Fifth Edition- P70

Networking: A Beginner’s Guide Fifth Edition- P70:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | Chapter 21 Introduction to Linux Systems Administration 327 Figure 21-3. Setting user properties The Password Info tab lets you set password expiration settings for the selected user account. The Groups tab lets you assign security group membership to the selected user account. To remove a user from the main User Manager window select the user account to be deleted and then click the Delete button in the toolbar. Changing Root s Password As mentioned in the previous chapters the root user is a special user who has a lot of power on the system. Obviously an account with this much power needs to be protected with a good password. If you think that someone might have gotten the root password or that someone who had the root password should no longer have it for example a former employee you should immediately change it. To change the root password on a system from the System menu choose Administration then Root Password. After being prompted for the current root password you see the dialog box shown in Figure 21-4. Enter the new password to use for the root account in the two fields provided. The program will not let you change the root password if both entries do not match exactly. Remember that Fedora Linux like all UNIX operating systems uses case-sensitive passwords. Click OK to complete the change. 328 Networking A Beginner s Guide Figure 21-4. Changing the root password Configuring Common Network Settings Linux is very much at home in a networked environment. In fact its design from the onset supports its use on a network. Networks are dynamic and Linux makes it easy to change the network configuration to accommodate the changes in the network. You manage network settings through the Network Configuration window as shown in Figure 21-5. To access this window open the System menu choose Administration and then choose Network. Figure 21-5. Use the Network Configuration window to change the network configuration. Chapter 21 Introduction to Linux Systems .

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