Red Hat Enterprise Linux 5 Administration Unleashed

554APPENDIX DTroubleshootingQ. When trying to use the setfacl command to set the ACLs for a file, I receive theerror message Operation not supported. I am using the syntax for the commandfrom Chapter 4, “Understanding Linux Concepts.” Why is it not working?A. If you see this error message, most likely you have forgotten to enable ACLs for thefilesystem in /etc/fstab or forgotten to reboot to enable the changes to/etc/fstab.Refer to the section “Enabling ACLs” in Chapter 7, “Managing Storage,” for detailson modifying the /etc/fstab file.Q. My system is running the 64-bit version of Red Hat Enterprise Linux. Most of thedocumentation I read refers to files in the /lib/ and /usr/lib/ directories, but Icannot find these files on my system. Where do I get these files?A. Most likely, you are just looking in the wrong directory. Most of the packages andlibraries for the 64-bit version of Red Hat Enterprise Linux are built specifically forthe 64-bit architecture. Look in the /lib64/ and /usr/lib64/ directories instead.System Administration TroubleshootingQ. I am exporting the home directories of my organization to all workstations from aSAN using NFS. Because NFS does not perform any authentication, I need to makesure all the UIDs for each user are the same on all workstations. How do I do this?A. This can be accomplished in a few different ways. If you are adding local users toeach workstation, you can either specify the UID to use when creating each userwith the -u option to the useradd command or select the Specify user IDmanually option in the User Manager graphical application.Or, you can configure all workstations to use a network authentication method foruser login so that the user database comes from one location, meaning all the UIDsused on the workstations are the same. For more information about networkauthentication methods, refer to Chapter 12, “Identity Management.”Q. I am using the tar utility from Chapter 10, “Techniques for Backup and Recovery,”in my backup process. However, when I recover the files, the ACLs for the files arenot preserved. How do I back up the ACLs for the filesystem as well?A. The tar and dump programs do not preserve ACLs. The star utility must be usedinstead. Installing the star RPM package will allow you to use the star program.Q. The filesystem containing my /boot directory has failed, and I have installed a newhard drive with a new /boot partition, including files restored from backup. How doI configure the system to use the new /boot partition if I can start the operatingsystem?A. To boot the system without mounting any filesystems, boot in to rescue mode asdescribed in the “Recovery and Repair” section of Chapter 10. Once the system is inrescue mode, mount the filesystem containing the /etc/fstab file. Modify the/etc/fstab file to use the new /boot partition.