Upgrading or Restoring the Linux Operating SystemUpdating the Operating System and Express5800/ftServer System Software 4-5By default, the Update Agent on a system running Express Builder is configured toaccess the following servers:• The Red Hat RHN server for Linux OS patchesTo upgrade the Linux operating system1. Start the Red Hat Update Agent from the graphical desktop, or by running theup2date command on the command line.The Update Agent does the following:• Queries the RHN server for new versions of RPMs that are already installed onyour system.• Lists all available updates.2. Select the updates you want to install.• By default all available OS updates that do not affect the kernel are selectedfor installation.• By default all available OS updates that do require kernel modification are notselected.To install these updates, explicitly select their check boxes.• By default, all available Express Builder updates are selected for installation.3. The Update Agent downloads the updates and prompts you to install them.4. To install a new version of Express Builder, see ‘‘Upgrading or Restoring Express Builder.”5. Reboot the system only if you manually selected an update that modifies thekernel.By default, the Update Agent only updates RPMs that are already installed on thesystem. If the operating system upgrade failed or you want to return the system to theprevious operating system version, see ‘‘Recovering from a Failed Software Upgrade’’on page 4-8.Restoring the Linux Operating System1. Make sure that you have a backup system disk, in case the reinstallation fails oryou want to return to the previous version of the Linux operating system. See‘‘Creating a Backup System Disk’’ on page 4-7 for details.2. Shut down the ftServer system with the command:# halt -p3. See the User Guide (Setup) to ensure that your system is configured for reinstallation.
