Part II The SUSE System in .NET

Use ANSI/AIM Code 128 in .NET Part II The SUSE System
Part II The SUSE System
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The chkconfig -list produces a useful summary of what is running in your runlevels. You may find that you want only certain programs running in your default runlevel. If this is the case, you can stop services from loading in your runlevel by using chkconfig -d service (delete) to turn off the named service. Similarly, you can use chkconfig -a service (add) to add a service to all multiuser runlevels. As a shortcut, you can use the command chkconfig service on|off to activate (on) or deactivate (off) the named service at all multiuser runlevels. To specify that a named service be started at one or more specific runlevels, you can append those runlevels to the chkconfig command. For example, both of the following chkconfig commands configure your system to start the apache web server at runlevels 3 and 5:
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When explicitly specifying the runlevels at which Apache should start, the on command is implied.
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As a general rule, if you are running a server using SUSE (or any other operating system for that matter), you should turn off any services that are not needed for the running of that specific server. For example, if you were running a web server for your organization, you would not run X Windows because it is not needed to run Apache. In this situation, you would probably run in a default runlevel of 3 (multiuser, with network, no X Windows) and turn off any non-essential services using the chkconfig program. Listing 4-1 shows the output of chkconfg -list after we have turned off any services that are not needed to run Apache.
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Listing 4-1: Output of chkconfig -list with a Customized runlevel
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apache2 cron fbset kbd network nscd postfix random resmgr splash splash_early splash_late sshd syslog 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 0:off 1:off 1:off 1:on 1:on 1:off 1:off 1:off 1:off 1:off 1:on 1:off 1:off 1:off 1:off 2:off 2:on 2:on 2:on 2:on 2:off 2:off 2:on 2:on 2:on 2:on 2:on 2:off 2:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 3:on 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 4:off 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 5:on 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off 6:off
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If you are customizing a runlevel for a specific purpose (again, for Apache in this example), you should choose the runlevel that is closest in principle to what you need to run just for Apache and then customize it to your situation. Because we do not need X Windows, but we do need a multiuser system with networking, we choose runlevel 3 as a default and then customize it down.
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4 Booting the System
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We will now go back to the beginning of the boot process and talk about boot managers. As you saw earlier in the chapter, the boot manager helps the system load other operating systems. You should see it as a stepping stone from the BIOS to the operating system itself. Two boot loaders are used in Linux the traditional LILO boot loader and the newer GRUB boot loader.
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The Linux Loader (LILO) was one of the first boot loaders available for Linux. It is a relatively simple loader that was designed from the start for simplicity and stability. One downside to using LILO is that its configuration information is stored in the MBR (Master Boot Record) for your primary hard drive. Any changes you make to the configuration mean that your MBR has to be updated every time. Changing your MBR is something that should not be taken lightly because if you corrupt it, the system will not boot. The MBR is what the BIOS looks for on a hard disk to see if it can boot from it. If this is corrupt or does not exist, the BIOS will not boot from the media. The configuration file for LILO is stored in /etc/lilo.conf. The layout of the lilo.conf file is relatively easy to read, and we will set up a simple LILO configuration for a Linux system and a Windows system for dual-booting purposes (see Listing 4-2). The lilo.conf file has a general configuration section that sets default values for LILO, followed by specific entries for different boot configurations that can be used to boot operating systems. Each boot configuration in the lilo.conf file is referred to as a boot profile because it specifies all of the custom options associated with booting a specific Linux kernel or other operating system.
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