Red Hat Enterprise Linux 5 Administration Unleashed

84CHAPTER 3Operating System UpdatesFirst, select which systems to update with one of the following methods:. Select specific systems for one-time use: Select Systems from the horizontal menu.Select the systems you want to work with using the check boxes in the first columnof the list, and click Update List. After the update list action is finished, the pageview does not change. Click System Set Manager from the vertical menu toperform a one-time action on these selected systems.. Use a predefined system group: To create a system group that can be used repeatedly,select Systems from the horizontal menu, and then select System Groups from thevertical menu. Click the create new group link in the upper-left corner of the page.To perform an action on a system group, select Systems from the horizontal menu,System Groups from the vertical menu, and then click Use Group under the Use inSSM column for the desired system group.From the System Set Manager, the following actions can be performed:. List the systems you have selected to work with. Schedule software updates (errata) relevant to selected systems. Upgrade, install, remove, and verify packages. Create and manage groups. Manage software channels. Provision systems (requires subscription to RHN Provisioning Module). Update hardware and software profiles. Add and remove additional RHN entitlements. Delete systems from RHN profile. Reboot selected systemsFor example, to apply software updates, click the Schedule errata updates link. A list oferrata that can be applied to one or more systems from those you just selected or thesystem group selected is shown. Select the errata to apply (there might be multiple pagesof errata), and click Apply Errata. On the next page, make sure all the errata you want toapply are listed. Select to either schedule action as soon as possible or schedule it for nolonger than a specific time. Finally, click Schedule Updates to finish.TIPTo check on the status of the action, click the Schedule link in the horizontal menu.To install software via the RHN website on a set of systems, select Install from the list ofSystem Set Manager actions. If the selected systems or the system group has more thanone parent channel, select the channel containing the software to be installed. Select the