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Linux server can be booted in many different ways. One method is by setting the runlevel in the configuration file /etc/inittab, as shown in Figure 4-5. The runlevel is the state your system starts in. Using the runlevel, you can determine which programs are started automatically and which aren t. When using Windows, this is similar to starting Windows in safe mode, safe mode with networking, and so on. On a Linux system, this same concept is called a runlevel. Normally, seven runlevels are defined: runlevel 0: This is the runlevel that is activated when you shut down your system. runlevel 1: On Open Enterprise Server, this is single-user mode. Only the most essential services are started and you have only one virtual console to log in from. runlevel 2: This is local multiuser without network services. You could use this runlevel if you have a problem with some network services and want to test them extensively. runlevel 3: In runlevel 3, your system is fully functional. You can do anything you like, have network services available, and have six different virtual consoles, but the graphical user interface isn t started automatically. This is a good runlevel to set as default on a Linux system used as a server. runlevel 4: This runlevel is not in use currently. runlevel 5: This is the default runlevel you get after performing a default installation of Open Enterprise Server. In fact, runlevel 5 is the same as runlevel 3, except that a graphical login prompt is generated automatically. In Open Enterprise Server, the KDE Display Manager (KDM) is used for that. runlevel 6: When you activate runlevel 6, your computer reboots.

Figure 4-19. Using a bad choice of REQUEST value Because the letters Go appear in the text Goodbye, the condition will return true and the process will run, even though the user clicked the submit button rather than the logout button.

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Figure 4-5. The runlevels on your server are defined in /etc/inittab. Now that you are familiar with the concept of runlevels, you might ask yourself if these runlevels are manageable. In fact, they are. When a certain runlevel is activated, the system starts all services in the directory used by that runlevel. In /etc/inittab, you ll find the exact definition of that directory. For the default runlevel 5, for example, the directory /etc/init.d/ rc5.d is used. In this directory, your system finds symbolic links (UNIX s way of creating a shortcut) to scripts that are used to start services in your runlevel. Symbolic links to scripts also exist, which are used to stop these same services if you leave your runlevel for another runlevel. So, in short, all you need to define your runlevel are symbolic links to the services you want to start automatically. Of course, you ll need a decent script to start these services in the first place. If you re a Linux guru, you can configure it all by hand with commands like ln s /etc/ init.d/sbm /etc/init.d/rc5.d/S35smb (this command is normally used to start the Samba server). If this frightens you, you can also use the runlevel editor integrated in the system management tool YaST to do it from a graphical interface, as shown in Figure 4-6. Additional services can also be started automatically in a runlevel by using the command chkconfig. If, for example, you want to activate the smb script automatically in runlevel 3 each time your computer boots up, use chkconfig smb 3.

Caution Check your REQUEST values to make sure that they will match only when you want them to, and try to avoid using a REQUEST value that is a substring of another REQUEST value you re using. Note that you don t need to worry about this issue when you use one of the condition types that deal with properly delimited values, such as those that are colon-delimited.

Figure 4-6. You can set up everything that must be started from your runlevels in the YaST runlevel editor.

In this chapter, we began the journey that will take us through the rest of the book. We started with an introduction to the business problem. We explored the business problem and created user stories along the way. Then we assigned a cost to each of the user stories.

The Value of Item in Expression1 = Expression 2 condition type allows you to perform a casesensitive comparison of the value of an item specified in Expression 1 with a string contained

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