Booting from the hard disk with special boot parameters in .NET

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Booting from the hard disk with special boot parameters
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Sometimes it is enough to boot the system from hard disk, but into runlevel 1 (by simply typing the digit 1 as a boot parameter (in the initial boot screen). Runlevel 1 is single user mode, with no networking and without starting most services. So if there is a problem that is causing the boot process to fail at a later stage, you may be able to solve the problem by booting into runlevel 1 and making the
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necessary changes. You can run YaST or edit configuration files in this state, and then reboot or bring the system up to runlevel 3 or 5 with one of the commands init 3 or init 5.
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CrossReference 4 has more information on booting into specific runlevels.
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If you have lost the root password, you can boot with the following parameter:
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init=/bin/bash rw
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This starts the system but bypasses the normal init system, instead taking you straight to a shell, without the need to log in, and mounting the root partition read-write. You can then, if necessary, remove the root password by editing the file /etc/shadow using vi and removing the encrypted password. You need to change it from looking something like the first line below to something like the second.
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root:cJLgWo7eN1gqk:12629:0:10000:::: root::12629:0:10000::::
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Booting into the Rescue System
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The SUSE installation media offer a special option when you boot from them: One of the menu items is Rescue System. If you boot from the first CD or DVD and choose this option, a Linux system that runs in memory loads and does not mount any hard disk partitions. You can log into it as root without a password. You can then mount any of the partitions on the hard disk to /mnt and make changes before rebooting. For example, if your root partition is /dev/hda1, you could do:
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Rescue:~ # mount /dev/hda1 /mnt
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followed by, for example:
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Rescue:~ # vi /mnt/etc/fstab
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Booting into YaST System Repair mode
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SUSE also provides a System Repair mode with YaST. If you boot from the installation media and choose the option Installation, but add the boot parameter repair=1, you enter a system similar to the Rescue System (running in memory and with no hard disk partitions mounted), but with YaST running in graphical mode. In this system you can use parts of YaST s standard functionality to repair a broken system. The main screen offers three options: Automatic Repair, Customized Repair, and Expert Tools. If you choose Automatic Repair, the YaST system check repair runs through a series of tests and shows a commentary on the screen. Among the tests it runs are filesystem checks, verification of the package database, a check on the boot loader configuration, and a check of the initrd (the initial ramdisk used at boot time). If problems are found, it offers to attempt a repair.
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14 Working with the System
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The Customized Repair screen
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If you choose Customized Repair (see Figure 14-1), you can select or deselect the particular tests that you want to be run. If you have a good idea of what might be at fault, this reduces the time the tests and repairs need to run. The options are: Check Partition Tables Check Swap Areas Check File Systems Check fstab Entries Check Package Database Check Minimal Package Selection Verify Base Packages Check Boot Loader Configuration
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Figure 14-1: The YaST System Repair mode Customized Repair screen
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The most useful of these are those concerned with filesystems and boot loaders. Although journaling filesystems mean that filesystem corruption is unlikely, if it occurs and prevents the system from booting normally, this filesystem option is useful because it will run a filesystem check for you with the correct options. If you have a dual-boot system, and you have reinstalled Windows, the Windows installer may overwrite the Master Boot Record and prevent Linux from booting at all. The boot loader check can rewrite the boot loader (usually grub) so that both systems can be booted correctly. If the package database does not correspond to the packages that are actually on the system, or if packages have become corrupt, the package checking tools can correct the problem.