Operating System Recovery, Hardware/software problems

Chapter 5: Operating System Recovery

Chapter contents

This chapter describes how to recover from problems with the Red Hat Enterprise Linux Server Edition 3.0 operating system. The topics included in this section are:

●Hardware/software problems

●Booting into single-user mode

●Booting into emergency mode

Hardware/software problems

This category can result from a variety of issue. Examples of this type of problem include:

●failing hard drives, or

●specifying an invalid root device or kernel in the boot loader configuration file.

If these problems occur, you may not be able to reboot the Red Hat Enterprise Linux. You can use one of the system recovery modes to try and resolve the problem, or, get copies of the most important files.

Root password

If you forget your root password, do the following:

1.Boot into rescue mode or single-user mode. See Booting into rescue mode.

2.Use the passwd command to reset the root password.

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Avaya R3.0 manual Operating System Recovery, Hardware/software problems, Root password, Booting into emergency mode

Contents

19-300174 Issue 6 August Secure Services Gateway SSGMaintenance Guide in support of the Secure Access and Control Offer SAC R3.0 Email totalware@gwsmail.com 2005 Avaya Inc. All Rights Reserved Chapter 3 Server Initialization and Shutdown Chapter 1 Maintenance OverviewChapter 2 Hardware Upgrade and Maintenance Chapter 5 Operating System Recovery 4 Secure Services Gateway SSG Maintenance Guide Chapter 6 SSG Configuration Backup and RestoreIndex Contents Overview Related resources Linux operating system manuals Chapter 1 Maintenance OverviewChapter contents Overview Document Title ContentRelated resources Table 1 Related Resources 2 of Table 1 Related Resources continued 3. Under the column Support Resources, go to Documentation Linux operating system manuals In this chapter Chapter 2 Hardware Upgrade and MaintenanceInstallation guidelines Installation guidelines Removing the cover of the x305 IBM server Handling static sensitive devices System reliability guidelines General safety guidelines Replacing the hard drive Replacing the hard drive in an x305 IBM serverReplacing the hard drive in an x306 IBM server 4 Replace the hard drive. x305 see Replacing the hard drive in an Tasks to replace the hard driveTask Description Removing the cover of the x305 IBM server 3. Installing the new hard drive in the x305 IBM serverRead General safety guidelines and Handling static sensitive devices Replacing the hard drive in an x305 IBM server Figure 1 Captive screws on cover Figure 2 Removing and replacing the drive cage Removing the hard drive from the x305 IBM server Replacing the cover of the x305 IBM server Installing the new hard drive in the x305 IBM server Removing the hard drive from the x306 IBM server 2. Installing the new hard drive in the x306 IBM serverFigure 3 Removing and installing the hard drive Replacing the hard drive in an x306 IBM server Replacing the x305 IBM server’s RSA Installing the new hard drive in the x306 IBM server 20 Secure Services Gateway SSG Maintenance Guide Replacing the server’s dual NIC Chapter 3 Server Initialization and Shutdown Server initializationServer initialization System shutdown System shutdown Gathering system information Monitoring system processes Chapter 4 Operating System MonitoringGathering system information Monitoring system processes Memory usage Table 3 Interactive Commands Command Description File systems Virtual memorySpace used by files in a directory Additional resources Hardware/software problems Booting into single-user mode Chapter 5 Operating System RecoveryHardware/software problems Root password linux rescue Booting into rescue mode fdisk -l one sh-2.05b#chroot /mnt/sysimage mount -t ext3 /dev/hda5 /foo Booting into single-user mode Booting into emergency mode 32 Secure Services Gateway SSG Maintenance Guide Chapter 6 SSG Configuration Backup and Restore Backing up the SSG configurationBacking up the SSG configuration Restoring the SSG configuration Figure 4 Edit Backup Scheduler Configuration Page SSG Configuration Backup and Restore34 Secure Services Gateway SSG Maintenance Guide 6. Click Save Changes c. tar zfx ~/SSG-Product Id-Date-Time.tgz Restoring the SSG configurationpgrestore -v -p 6543 -d avssgdb -a -Ft --no-owner dbdumpfilename.tar a. mkdir tempdir b. cd tempdir Index Index 38 Secure Services Gateway SSG Maintenance Guide

Avaya R3.0 Operating System Recovery, Hardware/software problems, Root password, Chapter contents

Models: R3.0

Chapter 5: Operating System Recovery

●Hardware/software problems

●Booting into emergency mode

Hardware/software problems

Root password