Red Hat Enterprise Linux Installation Guide 5.2 - linux.meuhobby.com

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Chapter 26. Basic System Recovery If you do not know the names of all physical partitions, use the following command to list them: fdisk -l If you do not know the names of all LVM2 physical volumes, volume groups, or logical volumes, use the following commands to list them: pvdisplay vgdisplay lvdisplay From the prompt, you can run many useful commands, such as: • ssh, scp, and ping if the network is started • dump and restore for users with tape drives • parted and fdisk for managing partitions • rpm for installing or upgrading software • joe for editing configuration files Note If you try to start other popular editors such as emacs, pico, or vi, the joe editor is started. 2.1. Reinstalling the Boot Loader In many cases, the GRUB boot loader can mistakenly be deleted, corrupted, or replaced by other operating systems. The following steps detail the process on how GRUB is reinstalled on the master boot record: • Boot the system from an installation boot medium. • Type linux rescue at the installation boot prompt to enter the rescue environment. • Type chroot /mnt/sysimage to mount the root partition. 272
Booting into Single-User Mode • Type /sbin/grub-install /dev/hda to reinstall the GRUB boot loader, where /dev/hda is the boot partition. • Review the /boot/grub/grub.conf file, as additional entries may be needed for GRUB to control additional operating systems. • Reboot the system. 3. Booting into Single-User Mode One of the advantages of single-user mode is that you do not need a boot CD-ROM; however, it does not give you the option to mount the file systems as read-only or not mount them at all. If your system boots, but does not allow you to log in when it has completed booting, try single-user mode. In single-user mode, your computer boots to runlevel 1. Your local file systems are mounted, but your network is not activated. You have a usable system maintenance shell. Unlike rescue mode, single-user mode automatically tries to mount your file system. Do not use single-user mode if your file system cannot be mounted successfully. You cannot use single-user mode if the runlevel 1 configuration on your system is corrupted. On an x86 system using GRUB, use the following steps to boot into single-user mode: 1. At the GRUB splash screen at boot time, press any key to enter the GRUB interactive menu. 2. Select Red Hat Enterprise Linux with the version of the kernel that you wish to boot and type a to append the line. 3. Go to the end of the line and type single as a separate word (press the Spacebar and then type single). Press Enter to exit edit mode. 4. Booting into Emergency Mode In emergency mode, you are booted into the most minimal environment possible. The root file system is mounted read-only and almost nothing is set up. The main advantage of emergency mode over single-user mode is that the init files are not loaded. If init is corrupted or not working, you can still mount file systems to recover data that could be lost during a re-installation. To boot into emergency mode, use the same method as described for single-user mode in Section 3, “Booting into Single-User Mode” with one exception, replace the keyword single with the keyword emergency. 273
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Red Hat Enterprise Linux 5.2 Red Ha
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Red Hat Enterprise Linux 5.2: Red H
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Introduction ......................
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4.3. Problems with the X Window Sys
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Message ...........................
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2. Upgrading Your System ..........
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Introduction Welcome to the Red Hat
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Document Conventions example: Go to
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Where to Find Other Manuals If you
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Part I. x86, AMD64, Intel® 64 and
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Chapter 1. Itanium System Specific
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Chapter 2. Steps to Get You Started
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Chapter 3. System Specifications Li
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Chapter 4. Installing on Intel® an
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Chapter 5. Removing Red Hat Enterpr
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Chapter 6. Troubleshooting Installa
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Saving Traceback Messages Without a
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Diskette Drive in run rc = self.tod
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Problems with the X Window System (
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Your Printer Does Not Work In /boot
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Chapter 7. Driver Media for Intel a
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Using a Driver Image During Install
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Chapter 8. Additional Boot Options
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Chapter 9. The GRUB Boot Loader cap
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Chapter 9. The GRUB Boot Loader 4.
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Chapter 9. The GRUB Boot Loader The
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Chapter 9. The GRUB Boot Loader •
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Chapter 9. The GRUB Boot Loader # s
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Chapter 9. The GRUB Boot Loader For
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Chapter 11. Steps to Get You Starte
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Preparing for FTP and HTTP installa
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Preparing for a Hard Drive Installa
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Chapter 12. Installing on IBM Syste
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A Note about Linux Virtual Consoles
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The Text Mode Installation Program
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Interface display a summary of avai
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Installing via NFS 8. Performing a
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Installing via HTTP Figure 12.7. FT
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Welcome to Red Hat Enterprise Linux
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Enter the Installation Number Figur
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Disk Partitioning Setup Warning The
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Create Default Layout Figure 12.14.
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Partitioning Your System Tip [This
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Disk Druid's Buttons to edit an exi
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Recommended Partitioning Scheme •
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Adding Partitions • Mount Point:
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Network Configuration Figure 12.18.
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Time Zone Configuration password to
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Set Root Password Figure 12.21. Roo
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Package Group Selection Note Users
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Installing Packages To cancel this
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Chapter 13. Driver Media for IBM PO
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Chapter 14. Troubleshooting Install
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Trouble with Partition Tables This
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Unable to IPL from *NWSSTG 4. Probl
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Your Printer Does Not Work If you c
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vnc this command allows you to inst
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Part III. IBM System z Architecture
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Chapter 19. Sample Parameter Files
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Chapter 19. Sample Parameter Files
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Network Configuration After creatin
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Firewall Configuration Figure 29.9.
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SELinux Configuration on port 1234
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Package Selection After configuring
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Pre-Installation Script Figure 29.1
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Chroot Environment Figure 29.16. Po
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Saving the File Figure 29.17. Previ
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Chapter 30. Boot Process, Init, and
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The Kernel following format — /bo
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The /sbin/init Program K45named ->
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Running Additional Programs at Boot
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Shutting Down 4.2. Runlevel Utiliti
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Chapter 31. PXE Network Installatio
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Command Line Configuration The next
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Performing the PXE Installation Aft
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