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told about available printers by registering the printers in a local database. In BSD-like print servers this database is kept in a flat file called /etc/printcap. In System V print servers, a program called lpadmin is used to register printers, and it's anyone's guess what happens to that information. The way in which we register printers thus depends upon What kind of Unix we are using. Whether we are running any special network printer software [205, 90].

Figure 4-2: The SUSE system boot loader Selecting the default boot option, Linux, after SUSE has been installed will load the kernel and the initial ramdisk in memory. If you do not specify anything at this menu, the system automatically boots the default choice after ten seconds. The processor will then jump to the start of the kernel in memory and execute it. The execution of the kernel is usually very quick, within five seconds. After the kernel has loaded, you will see the initial ramdisk being mounted, and the small Linux distribution takes over and loads any drivers that are needed to load your Linux installation from the disk. SUSE hides much of the boot process behind a graphical screen that simply displays a progress bar. You can press F2 at any time during kernel loading and initialization to see detailed status messages that explain exactly what the system is doing.

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The initial ramdisk usually contains essential drivers that are needed to mount your / (root) filesystem. The kernel binary includes the basic drivers for IDE disk devices, so these are not loaded by the initial ramdisk, but the drivers for IDE CD-ROM devices are often loaded from the initial ramdisk. Similarly, the drivers for SCSI devices can either be compiled into the kernel or loaded through the initial ramdisk. The driver for the type of filesystem used on the initial RAM disk must also be compiled into the kernel, but you can load additional filesystem drivers from the initial ramdisk if you want to keep your kernel as small as possible. Either the kernel or the initial ramdisk must contain the driver for the type of filesystem used in your on-disk root filesystem.

The main difference is between BSD-like systems and System V. Recently, a replacement print service was introduced for a generic heterogeneous network. Called LPRng, this package preserves the simplicity of the BSD system while providing superior functionality to both [205]. To register a printer with a BSD-like printer service, we do the following: Think of a name for the printer. Decide whether it is going to be connected directly to a host or standalone on the network. Register the printer with the printing system so that the daemons which provide the print service know how to talk to it. This can inlcude manually making a 'spool' directory for its queue files. This normally lies under var/spool or /usr/spool. mkdir /vai/spool/printer-name

The reason drivers have to be loaded from the initial ramdisk is that the kernel is unable to access the / (root) filesystem if it does not contain the drivers to do this. Compiling drivers into the kernel is always safe but creates a larger kernel (which therefore uses more memory). If you lose your initial ramdisk, you may not be able to load the root filesystem in order to complete the boot process. In this case, you will need to use the SUSE Rescue System. We discuss this later in the chapter. Once the initial ramdisk has loaded any drivers needed to access the root filesystem, it is unmounted and the kernel reclaims the memory associated with the initial ramdisk. When this has been completed, the root filesystem is loaded and the boot process proceeds as normal by reading the default runlevel from the file /etc/inittab and then starting up the processes associated with the default runlevel.

The term runlevel in Unix is used to describe a set of predefined processes and services that are associated with a specific mode of Unix system operation. The processes associated with a certain runlevel are started by the /sbin/init process, as explained in the next section. Most Linux systems, including SUSE Linux, provide eight runlevels that you can use, numbered 0 through 6 and including runlevel s or S, which is shorthand for single-user mode and is equivalent to runlevel 1. Table 4-1 shows the general description of each runlevel.

for all i =1,...,I, =

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