Installation Guide

Red Hat Enterprise Linux 5

Installing Red Hat Enterprise Linux 5 for all architectures

Red Hat Engineering Content Services

Rüdiger Landmann

Red Hat Engineering Content Services

r.landmann@redhat.com

Jack Reed

Red Hat Engineering Content Services

jreed@redhat.com

Petr Bokoč

Red Hat Engineering Content Services

pbokoc@redhat.com

David Cantrell

VNC installation dcantrell@redhat.com

Hans De Goede

iSCSI hdgoede@redhat.com

Jon Masters

Driver updates jcm@redhat.com

Edited by

Rüdiger Landmann

r.landmann@redhat.com

Edited by

Jack Reed

jreed@redhat.com

Edited by

Petr Bokoč

pbokoc@redhat.com

Legal Notice

Abstract

This Installation Guide documents relevant information regarding the installation of Red Hat Enterprise Linux 5.

Part I. x86, AMD64, Intel® 64 and Itanium - Installation and Booting

The Red Hat Enterprise Linux Installation Guide for Intel and AMD 32-bit and 64-bit systems discusses the installation of Red Hat Enterprise Linux and some basic post-installation troubleshooting. Advanced installation options are covered in the second part of this manual.

Chapter 1. Itanium System Specific Information

1.1. Itanium System Installation Overview

Installing Red Hat Enterprise Linux on an Itanium system is different from installing Red Hat Enterprise Linux on an x86-based system. In general, the sequence of steps to a successful installation are the following:

Boot into the Extensible Firmware Interface (EFI) Shell.
If you cannot boot from the CD-ROM, make an LS-120 diskette from the boot image file provided with Red Hat Enterprise Linux.
Using the EFI Shell and the ELILO boot loader, load and run the kernel, and boot into the Red Hat Enterprise Linux installation program.

1.2. Itanium Systems — The EFI Shell

Before you start to install Red Hat Enterprise Linux on an Itanium, you must have a basic understanding of the EFI Shell, what it does, and the information it can provide.

The EFI Shell is a console interface used to launch applications (such as the Red Hat Enterprise Linux installation program), load EFI protocols and device drivers, and execute simple scripts. It is similar to a DOS console and can only access media that is FAT16 (VFAT) formatted.

The EFI Shell also contains common utilities that can be used on the EFI system partition. These utilities include edit, type, cp, rm, and mkdir. For a list of utilities and other commands, type help at the EFI Shell prompt.

The EFI Shell contains a boot loader called ELILO. Additional information on EFI can be found at the following URL:

http://developer.intel.com/technology/efi/index.htm

1.2.1. Itanium Systems — EFI Device Names

The map command can be used to list all devices and file systems that EFI can recognize. When your Itanium system boots into the EFI shell, it probes your system in the following order:

LS-120 drive (if it contains media)
IDE hard drives on the primary IDE interface
IDE hard drives on the secondary IDE interface
SCSI hard drives on the SCSI interface
CD-ROM drives on the IDE interface
CD-ROM drives on the SCSI interface

To view the results of this system poll, type the following command at the EFI Shell prompt:

map

The output is listed in the order the system was probed. So, all FAT16 file systems are listed first, then IDE hard drives, then SCSI hard drives, then IDE CD-ROM drives, and finally SCSI CD-ROM drives.

For example, output of the map command might look like the following:

Device mapping table   
	fs0  : VenHw(Unknown Device:00)/HD(Part1,Sig00000000)   
	fs1  : VenHw(Unknown Device:80)/HD(Part1,Sig00000000)   
	fs2  : VenHw(Unknown Device:FF)/CDROM(Entry1)/HD(Part1,Sig00000000)   
	blk0 : VenHw(Unknown Device:00)   
	blk1 : VenHw(Unknown Device:00)/HD(Part1,Sig00000000)   
	blk2 : VenHw(Unknown Device:80)   
	blk3 : VenHw(Unknown Device:80)/HD(Part1,Sig00000000)   
	blk4 : VenHw(Unknown Device:80)/HD(Part2,Sig00000000)   
	blk5 : VenHw(Unknown Device:80)/HD(Part3,Sig00000000)   
	blk6 : VenHw(Unknown Device:80)/HD(Part3,Sig00000000)/HD(Part1,Sig725F7772)  
	blk7 : VenHw(Unknown Device:FF)   
	blk8 : VenHw(Unknown Device:FF)/CDROM(Entry1)   
	blk9 : VenHw(Unknown Device:FF)/CDROM(Entry1)/HD(Part1,Sig00000000)

In this example, there is an LS-120 diskette in the LS-120 drive as well as a CD-ROM in the CD-ROM drive. All the listings beginning with fs are FAT16 file systems that EFI can read. All the listings beginning with blk are block devices that EFI recognizes. Both the file systems and block devices are listed in the order they are probed. Therefore, fs0 is the system partition on the LS-120, fs1 is the system partition on the hard drive, and fs2 is the system partition on the CD-ROM.

1.2.2. Itanium Systems — EFI System Partition

When partitioning your hard drive for Linux, you must create a system partition that is FAT16 (VFAT) formatted and has a mount point of /boot/efi/. This partition contains the installed Linux kernel(s) as well as the ELILO configuration file (elilo.conf). The elilo.conf file contains a list of kernels from which you can boot your system.

Chapter 2. Steps to Get You Started

2.1. Upgrade or Install?

For information to help you determine whether to perform an upgrade or an installation refer to Chapter 24, Upgrading Your Current System.

2.2. Is Your Hardware Compatible?

Hardware compatibility is particularly important if you have an older system or a system that you built yourself. Red Hat Enterprise Linux 5 should be compatible with most hardware in systems that were factory built within the last two years. However, hardware specifications change almost daily, so it is difficult to guarantee that your hardware is 100% compatible.

The most recent list of supported hardware can be found at:

http://hardware.redhat.com/hcl/

2.3. Do You Have Enough Disk Space?

Nearly every modern-day operating system (OS) uses disk partitions, and Red Hat Enterprise Linux is no exception. When you install Red Hat Enterprise Linux, you may have to work with disk partitions. If you have not worked with disk partitions before (or need a quick review of the basic concepts), refer to Chapter 26, An Introduction to Disk Partitions before proceeding.

The disk space used by Red Hat Enterprise Linux must be separate from the disk space used by other OSes you may have installed on your system, such as Windows, OS/2, or even a different version of Linux. For x86, AMD64, and Intel® 64 systems, at least two partitions (/ and swap) must be dedicated to Red Hat Enterprise Linux. For Itanium systems, at least three partitions (/, /boot/efi/, and swap) must be dedicated to Red Hat Enterprise Linux.

Before you start the installation process, you must

have enough unpartitioned^[1] disk space for the installation of Red Hat Enterprise Linux, or
have one or more partitions that may be deleted, thereby freeing up enough disk space to install Red Hat Enterprise Linux.

To gain a better sense of how much space you really need, refer to the recommended partitioning sizes discussed in Section 4.19.4, “Recommended Partitioning Scheme”.

If you are not sure that you meet these conditions, or if you want to know how to create free disk space for your Red Hat Enterprise Linux installation, refer to Chapter 26, An Introduction to Disk Partitions.

2.4. Can You Install Using the CD-ROM or DVD?

There are several methods that can be used to install Red Hat Enterprise Linux.

Installing from a CD-ROM or DVD requires that you have purchased a Red Hat Enterprise Linux product, you have a Red Hat Enterprise Linux 5.11 CD-ROM or DVD, and you have a DVD/CD-ROM drive on a system that supports booting from it.

If you do not already have a Red Hat Enterprise Linux 5.11 CD set or DVD, you can download one as an ISO image file from the Red Hat Customer Portal. Visit https://access.redhat.com/home and enter your Login and Password. Click on the Downloads link to obtain a list of all currently supported Red Hat Enterprise Linux products. If you do not already have a Login and Password for the Red Hat Customer Portal, visit https://access.redhat.com/downloads/ to purchase a subscription or obtain a free evaluation subscription. When you have obtained the image file, you can burn it to disk with the following procedure:

The exact series of steps that produces a CD from an image file varies greatly from computer to computer, depending on the operating system and disc burning software installed. Use this procedure as a general guide. You might be able to omit certain steps on your computer, or might have to perform some of the steps in a different order from the order described here.

Make sure that your disc burning software is capable of burning discs from image files. Although this is true of most disc burning software, exceptions exist.

In particular, note that the CD burning feature built into Windows XP and Windows Vista cannot burn CDs from images and that earlier Windows operating systems did not have any CD burning capability installed by default. Therefore, if your computer has a Windows operating system installed on it, you need a separate piece of software for this task. Examples of popular CD burning software for Windows that you might already have on your computer include Nero Burning ROM and Roxio Creator. If you use a Windows operating system on your computer and do not have disc burning software installed (or you are not sure that the software can burn discs from image files) InfraRecorder is a suitable alternative available from http://www.infrarecorder.org/, and is free and open-source.

The Disk Utility software installed by default with Mac OS X on Apple computers has the capability to burn CDs from images built into it already. Most widely-used CD burning software for Linux, such as Brasero and K3b, also includes this capability.

Insert a blank, writeable CD into your computer's CD or DVD burner. On some computers, a window opens and displays various options when you insert the disc. If you see a window like this, look for an option to launch your chosen disc burning program. If you do not see an option like this, close the window and launch the program manually.
Launch your disc burning program. On some computers, you can do this by right-clicking (or control-clicking) on the image file and selecting a menu option with a label like Copy image to CD, or Copy CD or DVD image. Other computers might provide you with a menu option to launch your chosen disc burning program, either directly or with an option like Open With. If none of these options are available on your computer, launch the program from an icon on your desktop, in a menu of applications such as the Start menu on Windows operating systems, or in the Mac Applications folder.
In your disc burning program, select the option to burn a CD from an image file. For example, in Nero Burning ROM, this option is called Burn Image and is located on the File menu.
Note that you can skip this step when using certain CD burning software; for example, Disk Utility on Mac OS X does not require it.
Browse to the disc image file that you downloaded previously and select it for burning.
Click the button that starts the burning process.

Your BIOS may need to be changed to allow booting from your DVD/CD-ROM drive. For more information about changing your BIOS, refer to Section 4.4.1, “Booting the Installation Program on x86, AMD64, and Intel® 64 Systems”.

2.4.1. Alternative Boot Methods

Boot DVD/CD-ROM

If you can boot using the DVD/CD-ROM drive, you can create your own CD-ROM to boot the installation program. This may be useful, for example, if you are performing an installation over a network or from a hard drive. Refer to Section 2.4.2, “Making an Installation Boot CD-ROM” for further instructions.

USB pen drive

If you cannot boot from the DVD/CD-ROM drive, but you can boot using a USB device, such as a USB pen drive, the following alternative boot method is available.

Your system firmware must support booting from a USB device in order for this boot method to work. Refer to the hardware vendor's documentation for details on specifying the device from which the system boots.

Important

When configuring partitions and file systems during installation, ensure you verify the USB device's size, name, and type. The order in which names are assigned to USB-attached storage devices can vary because certain devices may take longer to initialize than others. Consequently, a device may receive a different name than you expect, such as sdc instead of sda.

Make a copy of the Red Hat Enterprise Linux 5 installation files available. Either:
- Insert the Red Hat Enterprise Linux 5 installation DVD or CD-ROM#1.
- Mount an image of the Red Hat Enterprise Linux 5 installation DVD or CD-ROM#1.
- Ensure that the installation files are available on a network location accessible by your system, for example, on an NFS share that it can access.
Attach a USB flash drive to your system. The following steps presume a system that runs Red Hat Enterprise Linux 5.

Run dmesg to identify the device name for the drive. If you run dmesg shortly after you attach the drive, the device name appears in the most recent lines of output. For example, the following dmesg output shows a flash drive that receives the device name /dev/sdb:

Initializing USB Mass Storage driver...
scsi2 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 5
usb-storage: waiting for device to settle before scanning
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
  Vendor: USB 2.0   Model: Flash Disk        Rev: 5.00
  Type:   Direct-Access                      ANSI SCSI revision: 02
SCSI device sdb: 2043904 512-byte hdwr sectors (1046 MB)
sdb: Write Protect is off
sdb: Mode Sense: 0b 00 00 08
sdb: assuming drive cache: write through
SCSI device sdb: 2043904 512-byte hdwr sectors (1046 MB)
sdb: Write Protect is off
sdb: Mode Sense: 0b 00 00 08
sdb: assuming drive cache: write through
sdb: sdb1
sd 2:0:0:0: Attached scsi removable disk sdb
sd 2:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete

Unmount any partitions on the flash drive that are currently mounted. It is likely that your system automatically mounted any available partitions when you attached the flash drive.
1. Use the mount command to find any mounted partitions on the flash drive. For example, the following output shows a single partition on /dev/sdb is mounted, the partition named /dev/sdb1:
```
$ mount
/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1 on /boot type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/sdb1 on /media/BOOTUSB type vfat (rw,nosuid,nodev,uid=500,utf8,shortname=mixed,flush)
```
2. Unmount partitions with the umount command. For example, to unmount /dev/sdb1, run:
```
umount /dev/sdb1
```
  Run umount for each partition on the flash drive that is mounted.
Use fdisk to partition the flash drive to contain a single partition only, with the following parameters:
1. numbered 1.
2. partition type is set to b (W95 FAT32).
3. flagged as bootable.
Run mkdosfs to format the partition created in the previous step as FAT. For example:
```
mkdosfs /dev/sdb1
```
Mount the partition. For example:
```
mount /dev/sdb1 /mnt
```
Copy the contents of the isolinux/ directory of the installation DVD or CD-ROM#1 onto the flash drive.
Rename the configuration file from isolinux.cfg to syslinux.cfg. For example, if the flash drive is mounted on /mnt, run:
```
cd /mnt/; mv isolinux.cfg syslinux.cfg
```
1. If necessary, edit syslinux.cfg for your particular environment. For example, to configure the installation to use a kickstart file shared over NFS, specify:
```
linux ks=nfs:://ks.cfg
```
Copy the images/pxeboot/initrd.img file from the installation DVD or CD-ROM#1 onto the flash drive.
Unmount the flash drive. For example:
```
umount /dev/sdb1
```
Make the USB flash drive bootable. For example:
```
syslinux /dev/sdb1
```
Mount the flash drive again. For example:
```
mount /dev/sdb1 /mnt
```
Install the GRUB boot loader on the USB flash drive. For example:
```
grub-install --root-directory=/mnt /dev/sdb
```
Verify that the USB flash drive has a /boot/grub directory. If it does not, create the directory manually; for example:
```
mkdir -p /mnt/boot/grub
```

Create the boot/grub/grub.conf file on the flash drive as follows:

default=0
timeout=5
root (hd1,0)
title Red Hat Enterprise Linux installer
kernel /vmlinuz
initrd /initrd.img

Unmount the flash drive. For example:
```
umount /dev/sdb1
```
Detach the USB flash drive.
Attach the USB disk to the system on which you wish to install Red Hat Enterprise Linux.
Boot the target system from the USB flash drive.

2.4.2. Making an Installation Boot CD-ROM

isolinux (not available for Itanium systems) is used for booting the Red Hat Enterprise Linux installation CD. To create your own CD-ROM to boot the installation program, use the following instructions:

Copy the isolinux/ directory from the Red Hat Enterprise Linux DVD or CD #1 into a temporary directory (referred to here as <path-to-workspace>) using the following command:

cp -r <path-to-cd>/isolinux/ <path-to-workspace>

Change directories to the <path-to-workspace> directory you have created:

cd <path-to-workspace>

Make sure the files you have copied have appropriate permissions:

chmod u+w isolinux/*

Finally, issue the following command to create the ISO image file:

mkisofs -o file.iso -b isolinux.bin -c boot.cat -no-emul-boot \  
-boot-load-size 4 -boot-info-table -R -J -v -T isolinux/

Note

The above command was split into two lines for printing purposes only. When you execute this command, be sure to type it as a single command, all on the same line.

Burn the resulting ISO image (named file.iso and located in <path-to-workspace>) to a CD-ROM as you normally would.

2.5. Preparing for a Network Installation

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

The Red Hat Enterprise Linux installation media must be available for either a network installation (via NFS, FTP, or HTTP) or installation via local storage. Use the following steps if you are performing an NFS, FTP, or HTTP installation.

The NFS, FTP, or HTTP server to be used for installation over the network must be a separate machine which can provide the complete contents of the installation DVD-ROM or the installation CD-ROMs.

Note

The Red Hat Enterprise Linux installation program has the ability to test the integrity of the installation media. It works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Red Hat recommends that you test all installation media before starting the installation process, and before reporting any installation-related bugs (many of the bugs reported are actually due to improperly-burned CDs). To use this test, type the following command at the boot: prompt (prepend with elilo for Itanium systems):

linux mediacheck

Note

In the following examples, the directory on the installation staging server that will contain the installation files will be specified as /location/of/disk/space. The directory that will be made publicly available via FTP, NFS, or HTTP will be specified as /publicly/available/directory. For example, /location/of/disk/space may be a directory you create called /var/isos. /publicly/available/directory might be /var/www/html/rhel5, for an HTTP install.

To copy the files from the installation DVD or CD-ROMs to a Linux machine which acts as an installation staging server, perform the following steps:

Create an iso image from the installation disk(s) using the following command (for DVDs):
dd if=/dev/dvd of=/location/of/disk/space/RHEL5.iso
where dvd refers to your DVD drive device.

2.5.1. Preparing for FTP and HTTP installation

If you are setting up an installation tree for NFS, FTP, or HTTP installations, you must copy the RELEASE-NOTES files and all files from the RedHat directory on all operating systems ISO images. On Linux and UNIX systems, the following process will properly configure the target directory on your server (repeat for each CD-ROM/ISO image):

Insert CD-ROM or DVD-ROM.
mount /media/cdrom
If you are installing the Server variant, run cp -a /media/cdrom/Server <target-directory>
If you are installing the Client variant, run cp -a /media/cdrom/Client <target-directory>
cp /media/cdrom/RELEASE-NOTES* <target-directory> (Installation CD 1 or DVD only)
cp /media/cdrom/images <target-directory> (Installation CD 1 or DVD only)
umount /media/cdrom

(Where <target-directory> represents the path to the directory to contain the installation tree.)

Note

Do not copy the Supplementary ISO image, or any of the layered product ISO images, as this will overwrite files necessary for Anaconda's proper operation.

These ISO images must be installed after Red Hat Enterprise Linux has been installed.

Next make sure that the /publicly/available/directory directory is shared via FTP or HTTP, and verify client access. You can check to see whether the directory is accessible from the server itself, and then from another machine on the same subnet that you will be installing to.

2.5.2. Preparing for an NFS install

For NFS installation it is not necessary to mount the iso image. It is sufficient to make the iso image itself available via NFS. You can do this by moving the iso image or images to the NFS exported directory:

For DVD:
mv /location/of/disk/space/RHEL5.iso /publicly/available/directory/
For CDROMs:
mv /location/of/disk/space/disk*.iso /publicly/available/directory/

Ensure that the /publicly/available/directory directory is exported via NFS via an entry in /etc/exports.

To export to a specific system:

/publicly/available/directory client.ip.address

To export to all systems use an entry such as:

/publicly/available/directory *

Start the NFS daemon (on a Red Hat Enterprise Linux system, use /sbin/service nfs start). If NFS is already running, reload the configuration file (on a Red Hat Enterprise Linux system use /sbin/service nfs reload).

Be sure to test the NFS share following the directions in the Red Hat Enterprise Linux Deployment Guide.

2.6. Preparing for a Hard Drive Installation

Note

Hard drive installations only work from ext2, ext3, or FAT file systems. If you have a file system other than those listed here, such as reiserfs, you will not be able to perform a hard drive installation.

Hard drive installations require the use of the ISO (or DVD/CD-ROM) images. An ISO image is a file containing an exact copy of a DVD/CD-ROM image. After placing the required ISO images (the binary Red Hat Enterprise Linux DVD/CD-ROMs) in a directory, choose to install from the hard drive. You can then point the installation program at that directory to perform the installation.

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

To prepare your system for a hard drive installation, you must set the system up in one of the following ways:

Using a set of CD-ROMs, or a DVD — Create ISO image files from each installation CD-ROM, or from the DVD. For each CD-ROM (once for the DVD), execute the following command on a Linux system:
```
dd if=/dev/cdrom of=/tmp/file-name.iso
```
Using ISO images — transfer these images to the system to be installed.
Verifying that ISO images are intact before you attempt an installation, helps to avoid problems. To verify the ISO images are intact prior to performing an installation, use an md5sum program (many md5sum programs are available for various operating systems). An md5sum program should be available on the same Linux machine as the ISO images.

Note

The Red Hat Enterprise Linux installation program has the ability to test the integrity of the installation media. It works with the CD / DVD, hard drive ISO, and NFS ISO installation methods. Red Hat recommends that you test all installation media before starting the installation process, and before reporting any installation-related bugs (many of the bugs reported are actually due to improperly-burned CDs). To use this test, type the following command at the boot: prompt (prepend with elilo for Itanium systems):

linux mediacheck

Additionally, if a file called updates.img exists in the location from which you install, it is used for updates to anaconda, the installation program. Refer to the file install-methods.txt in the anaconda RPM package for detailed information on the various ways to install Red Hat Enterprise Linux, as well as how to apply the installation program updates.

^[1] Unpartitioned disk space means that available disk space on the hard drive(s) you are installing to has not been divided into sections for data. When you partition a disk, each partition behaves like a separate disk drive.

Chapter 3. System Specifications List

The most recent list of supported hardware can be found at http://hardware.redhat.com/hcl/.

This system specifications list will help you keep a record of your current system settings and requirements. Enter the corresponding information about your system in the list provided below as a handy reference to help make your Red Hat Enterprise Linux installation goes smoothly.

hard drive(s): type, label, size; e.g. IDE hda=40 GB
partitions: map of partitions and mount points; e.g. /dev/hda1=/home, /dev/hda2=/ (fill this in once you know where they will reside)
memory: amount of RAM installed on your system; e.g. 512 MB, 1 GB
CD-ROM: interface type; e.g. SCSI, IDE (ATAPI)
SCSI adapter: if present, make and model number; e.g. BusLogic SCSI Adapter, Adaptec 2940UW
network card: if present, make and model number; e.g. Tulip, 3COM 3C590
mouse: type, protocol, and number of buttons; e.g. generic 3 button PS/2 mouse, MouseMan 2 button serial mouse
monitor: make, model, and manufacturer specifications; e.g. Optiquest Q53, ViewSonic G773
video card: make, model number and size of VRAM; e.g. Creative Labs Graphics Blaster 3D, 8MB
sound card: make, chipset and model number; e.g. S3 SonicVibes, Sound Blaster 32/64 AWE
IP, DHCP, and BOOTP addresses
netmask
gateway IP address
one or more name server IP addresses (DNS)
domain name: the name given to your organization; e.g. example.com
hostname: the name of your computer; your personal choice of names; e.g. cookie, southpark

If any of these networking requirements or terms are unfamiliar to you, contact your network administrator for assistance.

Chapter 4. Installing on Intel® and AMD Systems

This chapter explains how to perform a Red Hat Enterprise Linux installation from the DVD/CD-ROM, using the graphical, mouse-based installation program. The following topics are discussed:

Becoming familiar with the installation program's user interface
Starting the installation program
Selecting an installation method
Configuration steps during the installation (language, keyboard, mouse, partitioning, etc.)
Finishing the installation

4.1. The Graphical Installation Program User Interface

If you have used a graphical user interface (GUI) before, you are already familiar with this process; use your mouse to navigate the screens, click buttons, or enter text fields.

You can also navigate through the installation using the keyboard. The Tab key allows you to move around the screen, the Up and Down arrow keys to scroll through lists, + and - keys expand and collapse lists, while Space and Enter selects or removes from selection a highlighted item. You can also use the Alt+X key command combination as a way of clicking on buttons or making other screen selections, where X is replaced with any underlined letter appearing within that screen.

Note

If you are using an x86, AMD64, or Intel® 64 system, and you do not wish to use the GUI installation program, the text mode installation program is also available. To start the text mode installation program, use the following command at the boot: prompt:

linux text

Refer to Section 4.3, “The Text Mode Installation Program User Interface” for a brief overview of text mode installation instructions.

It is highly recommended that installs be performed using the GUI installation program. The GUI installation program offers the full functionality of the Red Hat Enterprise Linux installation program, including LVM configuration which is not available during a text mode installation.

Users who must use the text mode installation program can follow the GUI installation instructions and obtain all needed information.

Note

If you are using an Itanium system, and you do not wish to use the GUI installation program, the text mode installation program is also available. To start the text mode installation program, type the following command at the EFI Shell prompt:

elilo linux text

4.1.1. A Note about Virtual Consoles

The Red Hat Enterprise Linux installation program offers more than the dialog boxes of the installation process. Several kinds of diagnostic messages are available to you, as well as a way to enter commands from a shell prompt. The installation program displays these messages on five virtual consoles, among which you can switch using a single keystroke combination.

A virtual console is a shell prompt in a non-graphical environment, accessed from the physical machine, not remotely. Multiple virtual consoles can be accessed simultaneously.

These virtual consoles can be helpful if you encounter a problem while installing Red Hat Enterprise Linux. Messages displayed on the installation or system consoles can help pinpoint a problem. Refer to Table 4.1, “Console, Keystrokes, and Contents” for a listing of the virtual consoles, keystrokes used to switch to them, and their contents.

Generally, there is no reason to leave the default console (virtual console #6) for graphical installations unless you are attempting to diagnose installation problems.

Table 4.1. Console, Keystrokes, and Contents
console	keystrokes	contents
1	`ctrl`+`alt`+`f1`	installation dialog
2	`ctrl`+`alt`+`f2`	shell prompt
3	`ctrl`+`alt`+`f3`	install log (messages from installation program)
4	`ctrl`+`alt`+`f4`	system-related messages
5	`ctrl`+`alt`+`f5`	other messages
6	`ctrl`+`alt`+`f6`	x graphical display

4.2. Screenshots during installation

Anaconda allows you to take screenshots during the installation process. At any time during installation, press Shift+Print Screen and anaconda will save a screenshot to /root/anaconda-screenshots.

If you are performing a Kickstart installation, use the autostep --autoscreenshot option to generate a screenshot of each step of the installation automatically. Refer to Section 31.3, “Creating the Kickstart File” for details of configuring a Kickstart file.

4.3. The Text Mode Installation Program User Interface

The Red Hat Enterprise Linux text mode installation program uses a screen-based interface that includes most of the on-screen widgets commonly found on graphical user interfaces. Figure 4.1, “Installation Program Widgets as seen in Boot Loader Configuration”, and Figure 4.2, “Installation Program Widgets as seen in Disk Druid”, illustrate the screens that appear during the installation process.

Note

While text mode installations are not explicitly documented, those using the text mode installation program can easily follow the GUI installation instructions. One thing to note is that manipulation of LVM (Logical Volume Management) disk volumes is only possible in graphical mode. In text mode it is only possible to view and accept the default LVM setup.

Figure 4.1. Installation Program Widgets as seen in Boot Loader Configuration

Figure 4.2. Installation Program Widgets as seen in Disk Druid

Here is a list of the most important widgets shown in Figure 4.1, “Installation Program Widgets as seen in Boot Loader Configuration” and Figure 4.2, “Installation Program Widgets as seen in Disk Druid”:

Window — Windows (usually referred to as dialogs in this manual) appear on your screen throughout the installation process. At times, one window may overlay another; in these cases, you can only interact with the window on top. When you are finished in that window, it disappears, allowing you to continue working in the window underneath.
Checkbox — Checkboxes allow you to select or deselect a feature. The box displays either an asterisk (selected) or a space (unselected). When the cursor is within a checkbox, press Space to select or deselect a feature.
Text Input — Text input lines are regions where you can enter information required by the installation program. When the cursor rests on a text input line, you may enter and/or edit information on that line.
Text Widget — Text widgets are regions of the screen for the display of text. At times, text widgets may also contain other widgets, such as checkboxes. If a text widget contains more information than can be displayed in the space reserved for it, a scroll bar appears; if you position the cursor within the text widget, you can then use the Up and Down arrow keys to scroll through all the information available. Your current position is shown on the scroll bar by a # character, which moves up and down the scroll bar as you scroll.
Scroll Bar — Scroll bars appear on the side or bottom of a window to control which part of a list or document is currently in the window's frame. The scroll bar makes it easy to move to any part of a file.
Button Widget — Button widgets are the primary method of interacting with the installation program. You progress through the windows of the installation program by navigating these buttons, using the Tab and Enter keys. Buttons can be selected when they are highlighted.
Cursor — Although not a widget, the cursor is used to select (and interact with) a particular widget. As the cursor is moved from widget to widget, it may cause the widget to change color, or the cursor itself may only appear positioned in or next to the widget.

4.3.1. Using the Keyboard to Navigate

Navigation through the installation dialogs is performed through a simple set of keystrokes. To move the cursor, use the Left, Right, Up, and Down arrow keys. Use Tab, and Shift-Tab to cycle forward or backward through each widget on the screen. Along the bottom, most screens display a summary of available cursor positioning keys.

To "press" a button, position the cursor over the button (using Tab, for example) and press Space or Enter. To select an item from a list of items, move the cursor to the item you wish to select and press Enter. To select an item with a checkbox, move the cursor to the checkbox and press Space to select an item. To deselect, press Space a second time.

Pressing F12 accepts the current values and proceeds to the next dialog; it is equivalent to pressing the OK button.

Warning

Unless a dialog box is waiting for your input, do not press any keys during the installation process (doing so may result in unpredictable behavior).

4.4. Starting the Installation Program

To start, first make sure that you have all necessary resources for the installation. If you have already read through Chapter 2, Steps to Get You Started, and followed the instructions, you should be ready to start the installation process. When you have verified that you are ready to begin, boot the installation program using the Red Hat Enterprise Linux DVD or CD-ROM #1 or any boot media that you have created.

Note

Occasionally, some hardware components require a driver diskette during the installation. A driver diskette adds support for hardware that is not otherwise supported by the installation program. Refer to Chapter 7, Updating drivers during installation on Intel and AMD systems for more information.

4.4.1. Booting the Installation Program on x86, AMD64, and Intel® 64 Systems

You can boot the installation program using any one of the following media (depending upon what your system can support):

Red Hat Enterprise Linux DVD/CD-ROM — Your machine supports a bootable DVD/CD-ROM drive and you have the Red Hat Enterprise Linux CD-ROM set or DVD.
Boot CD-ROM — Your machine supports a bootable CD-ROM drive and you want to perform network or hard drive installation.
USB pen drive — Your machine supports booting from a USB device.
PXE boot via network — Your machine supports booting from the network. This is an advanced installation path. Refer to Chapter 34, PXE Network Installations for additional information on this method.

To create a boot CD-ROM or to prepare your USB pen drive for installation, refer to Section 2.4.1, “Alternative Boot Methods”.

Insert the boot media and reboot the system. Your BIOS settings may need to be changed to allow you to boot from the CD-ROM or USB device.

Note

To change your BIOS settings on an x86, AMD64, or Intel® 64 system, watch the instructions provided on your display when your computer first boots. A line of text appears, telling you which key to press to enter the BIOS settings.

Once you have entered your BIOS setup program, find the section where you can alter your boot sequence. The default is often C, A or A, C (depending on whether you boot from your hard drive [C] or a diskette drive [A]). Change this sequence so that the CD-ROM is first in your boot order and that C or A (whichever is your typical boot default) is second. This instructs the computer to first look at the CD-ROM drive for bootable media; if it does not find bootable media on the CD-ROM drive, it then checks your hard drive or diskette drive.

Save your changes before exiting the BIOS. For more information, refer to the documentation that came with your system.

After a short delay, a screen containing the boot: prompt should appear. The screen contains information on a variety of boot options. Each boot option also has one or more help screens associated with it. To access a help screen, press the appropriate function key as listed in the line at the bottom of the screen.

As you boot the installation program, be aware of two issues:

Once the boot: prompt appears, the installation program automatically begins if you take no action within the first minute. To disable this feature, press one of the help screen function keys.
If you press a help screen function key, there is a slight delay while the help screen is read from the boot media.

Normally, you only need to press Enter to boot. Be sure to watch the boot messages to review if the Linux kernel detects your hardware. If your hardware is properly detected, continue to the next section. If it does not properly detect your hardware, you may need to restart the installation and use one of the boot options provided in Chapter 8, Additional Boot Options for Intel® and AMD Systems.

4.4.2. Booting the Installation Program on Itanium Systems

Your Itanium system should be able to boot the Red Hat Enterprise Linux installation program directly from the Red Hat Enterprise Linux CD #1. If your Itanium cannot boot the installation program from the CD-ROM (or if you want to perform a hard drive, NFS, FTP, or HTTP installation) you must boot from an LS-120 diskette. Refer to Section 4.4.2.2, “Booting the Installation Program from an LS-120 Diskette” for more information.

4.4.2.1. Booting the Installation Program from the DVD/CD-ROM

To boot from the Red Hat Enterprise Linux CD #1 follow these steps:

Remove all media except Red Hat Enterprise Linux CD #1.
From the Boot Option menu choose EFI Shell.
At the Shell> prompt, change to the file system on the CD-ROM. For example, in the above sample map output, the system partition on the CD-ROM is fs1. To change to the fs1 file system, type fs1: at the prompt.
Type elilo linux to boot into the installation program.
Go to Chapter 4, Installing on Intel® and AMD Systems to begin the installation.

4.4.2.2. Booting the Installation Program from an LS-120 Diskette

If your Itanium cannot boot from Red Hat Enterprise Linux CD #1, you must boot from an LS-120 diskette. If you want to perform a hard drive, NFS, FTP, or HTTP installation, you must boot from a boot LS-120 diskette.

You must create an LS-120 boot image file diskette from the boot image file on CD #1: images/boot.img. To create this diskette in Linux, insert a blank LS-120 diskette and type the following command at a shell prompt:

dd if=boot.img of=/dev/hda bs=180k

Replace boot.img with the full path to the boot image file and /dev/hda with the correct device name for the LS-120 diskette drive.

If you are not using the Red Hat Enterprise Linux CD, the installation program starts in text mode and you must choose a few basic options for your system.

If you are using the CD-ROM to load the installation program, follow the instructions contained in Chapter 4, Installing on Intel® and AMD Systems.

To boot from an LS-120 diskette follow these steps:

Insert the LS-120 diskette you made from the boot image file boot.img. If you are performing a local CD-ROM installation but booting off the LS-120 diskette, insert the Red Hat Enterprise Linux CD #1 also. If you are performing a hard drive, NFS, FTP, or HTTP installation, you do not need the CD-ROM.
From the Boot Option menu choose EFI Shell.
At the Shell> prompt, change the device to the LS-120 drive by typing the command fs0:, using the example map output above.
Type elilo linux to boot into the installation program.
Go to Chapter 4, Installing on Intel® and AMD Systems to begin the installation.

4.4.3. Additional Boot Options

While it is easiest to boot using a CD-ROM and perform a graphical installation, sometimes there are installation scenarios where booting in a different manner may be needed. This section discusses additional boot options available for Red Hat Enterprise Linux.

For Itanium users:

To pass options to the boot loader on an Itanium system, enter the following at the EFI Shell prompt:

elilo linux option

For x86, AMD64, and Intel® 64 users:

To pass options to the boot loader on an x86, AMD64, or Intel® 64 system, use the instructions as provided in the boot loader option samples below.

Note

Refer to Chapter 8, Additional Boot Options for Intel® and AMD Systems for additional boot options not covered in this section.

To perform a text mode installation, at the installation boot prompt, type:
```
linux text
```
ISO images have an md5sum embedded in them. To test the checksum integrity of an ISO image, at the installation boot prompt, type:
```
linux mediacheck
```
The installation program prompts you to insert a CD or select an ISO image to test, and select OK to perform the checksum operation. This checksum operation can be performed on any Red Hat Enterprise Linux CD and does not have to be performed in a specific order (for example, CD #1 does not have to be the first CD you verify). It is strongly recommended to perform this operation on any Red Hat Enterprise Linux CD that was created from downloaded ISO images. This command works with the CD, DVD, hard drive ISO, and NFS ISO installation methods.
Also in the images/ directory is the boot.iso file. This file is an ISO image than can be used to boot the installation program. To use the boot.iso, your computer must be able to boot from its CD-ROM drive, and its BIOS settings must be configured to do so. You must then burn the boot.iso file onto a recordable/rewriteable CD-ROM.
If you need to perform the installation in serial mode, type the following command:
```
linux console=<device>
```
For text mode installations, use:
```
linux text console=<device>
```
In the above command, <device> should be the device you are using (such as ttyS0 or ttyS1). For example, linux text console=ttyS0.
Text mode installations using a serial terminal work best when the terminal supports UTF-8. Under UNIX and Linux, Kermit supports UTF-8. For Windows, Kermit '95 works well. Non-UTF-8 capable terminals works as long as only English is used during the installation process. An enhanced serial display can be used by passing the utf8 command as a boot-time option to the installation program. For example:
```
linux console=ttyS0 utf8
```

4.4.3.1. Kernel Options

Options can also be passed to the kernel. For example, to apply updates for the anaconda installation program from a floppy disk enter:

linux updates

For text mode installations, use:

linux text updates

This command will prompt you to insert a floppy diskette containing updates for anaconda. It is not needed if you are performing a network installation and have already placed the updates image contents in rhupdates/ on the server.

After entering any options, press Enter to boot using those options.

If you need to specify boot options to identify your hardware, please write them down. The boot options are needed during the boot loader configuration portion of the installation (refer to Section 4.20, “x86, AMD64, and Intel® 64 Boot Loader Configuration” for more information).

For more information on kernel options refer to Chapter 8, Additional Boot Options for Intel® and AMD Systems.

4.5. Selecting an Installation Method

What type of installation method do you wish to use? The following installation methods are available:

DVD/CD-ROM: If you have a DVD/CD-ROM drive and the Red Hat Enterprise Linux CD-ROMs or DVD you can use this method. Refer to Section 4.6, “Installing from DVD/CD-ROM”, for DVD/CD-ROM installation instructions.
Hard Drive: If you have copied the Red Hat Enterprise Linux ISO images to a local hard drive, you can use this method. You need a boot CD-ROM (use the linux askmethod boot option). Refer to Section 4.7, “Installing from a Hard Drive”, for hard drive installation instructions.
NFS: If you are installing from an NFS server using ISO images or a mirror image of Red Hat Enterprise Linux, you can use this method. You need a boot CD-ROM (use the linux askmethod boot option). Refer to Section 4.9, “Installing via NFS” for network installation instructions. Note that NFS installations may also be performed in GUI mode.
FTP: If you are installing directly from an FTP server, use this method. You need a boot CD-ROM (use the linux askmethod boot option). Refer to Section 4.10, “Installing via FTP”, for FTP installation instructions.
HTTP: If you are installing directly from an HTTP (Web) server, use this method. You need a boot CD-ROM (use the linux askmethod boot option). Refer to Section 4.11, “Installing via HTTP”, for HTTP installation instructions.

4.6. Installing from DVD/CD-ROM

To install Red Hat Enterprise Linux from a DVD/CD-ROM, place the DVD or CD #1 in your DVD/CD-ROM drive and boot your system from the DVD/CD-ROM.

The installation program then probes your system and attempts to identify your CD-ROM drive. It starts by looking for an IDE (also known as an ATAPI) CD-ROM drive.

Note

To abort the installation process at this time, reboot your machine and then eject the boot media. You can safely cancel the installation at any point before the About to Install screen. Refer to Section 4.25, “Preparing to Install” for more information.

If your CD-ROM drive is not detected, and it is a SCSI CD-ROM, the installation program prompts you to choose a SCSI driver. Choose the driver that most closely resembles your adapter. You may specify options for the driver if necessary; however, most drivers detect your SCSI adapter automatically.

If the DVD/CD-ROM drive is found and the driver loaded, the installer will present you with the option to perform a media check on the DVD/CD-ROM. This will take some time, and you may opt to skip over this step. However, if you later encounter problems with the installer, you should reboot and perform the media check before calling for support. From the media check dialog, continue to the next stage of the installation process (refer to Section 4.12, “Welcome to Red Hat Enterprise Linux”).

4.7. Installing from a Hard Drive

The Select Partition screen applies only if you are installing from a disk partition (that is, if you used the askmethod boot options and selected Hard Drive in the Installation Method dialog). This dialog allows you to name the disk partition and directory from which you are installing Red Hat Enterprise Linux. If you used the repo=hd boot option, you already specified a partition.

Figure 4.3. Selecting Partition Dialog for Hard Drive Installation

Enter the device name of the partition containing the Red Hat Enterprise Linux ISO images. This partition must be formatted with a ext2 or vfat filesystem, and cannot be a logical volume. There is also a field labeled Directory holding images.

If the ISO images are in the root (top-level) directory of a partition, enter a /. If the ISO images are located in a subdirectory of a mounted partition, enter the name of the directory holding the ISO images within that partition. For example, if the partition on which the ISO images is normally mounted as /home/, and the images are in /home/new/, you would enter /new/.

After you have identified the disk partition, the Welcome dialog appears.

4.8. Performing a Network Installation

If you are performing a network installation and booted with the askmethod boot option, the Configure TCP/IP dialog appears. This dialog asks for your IP and other network addresses. You can choose to configure the IP address and Netmask of the device via DHCP or manually. If manually, you have the option to enter IPv4 and/or IPv6 information. Enter the IP address you are using during installation and press Enter. Note that you need to supply IPv4 information if you wish to perform an NFS installation.

Figure 4.4. TCP/IP Configuration

4.9. Installing via NFS

The NFS dialog applies only if you are installing from an NFS server (if you selected NFS Image in the Installation Method dialog).

Enter the domain name or IP address of your NFS server. For example, if you are installing from a host named eastcoast in the domain example.com, enter eastcoast.example.com in the NFS Server field.

Next, enter the name of the exported directory. If you followed the setup described in Section 2.5, “Preparing for a Network Installation”, you would enter the directory /export/directory/.

If the NFS server is exporting a mirror of the Red Hat Enterprise Linux installation tree, enter the directory which contains the root of the installation tree. You will enter an Installation Key later on in the process which will determine which subdirectories are used to install from. If everything was specified properly, a message appears indicating that the installation program for Red Hat Enterprise Linux is running.

Figure 4.5. NFS Setup Dialog

If the NFS server is exporting the ISO images of the Red Hat Enterprise Linux CD-ROMs, enter the directory which contains the ISO images.

Next, the Welcome dialog appears.

4.10. Installing via FTP

The FTP dialog applies only if you are installing from an FTP server (that is, if you used the askmethod boot options and selected FTP in the Installation Method dialog). This dialog allows you to identify the FTP server from which you are installing Red Hat Enterprise Linux. If you used the repo=ftp boot option, you already specified a server and path.

Figure 4.6. FTP Setup Dialog

Enter the name or IP address of the FTP site you are installing from, and the name of the directory containing the variant/ directory for your architecture. For example, if the FTP site contains the directory /mirrors/redhat/arch/variant;/, enter /mirrors/redhat/arch/ (where arch is replaced with the architecture type of your system, such as i386, ia64, ppc, or s390x, and variant is the variant that you are installing, such as Client, Server, Workstation, etc.). If everything was specified properly, a message box appears indicating that files are being retrieved from the server.

Next, the Welcome dialog appears.

Note

You can save disk space by using the ISO images you have already copied to the server. To accomplish this, install Red Hat Enterprise Linux using ISO images without copying them into a single tree by loopback mounting them. For each ISO image:

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

4.11. Installing via HTTP

The HTTP dialog applies only if you are installing from an HTTP server (that is, if you used the askmethod boot option and selected HTTP in the Installation Method dialog). This dialog prompts you for information about the HTTP server from which you are installing Red Hat Enterprise Linux. If you used the repo=http boot option, you already specified a server and path.

Enter the name or IP address of the HTTP site you are installing from, and the name of the directory containing the variant/ directory for your architecture. For example, if the HTTP site contains the directory /mirrors/redhat/arch/variant/, enter /mirrors/redhat/arch/ (where arch is replaced with the architecture type of your system, such as i386, ia64, ppc, or s390x, and variant is the variant that you are installing, such as Client, Server, Workstation, etc.). If everything was specified properly, a message box appears indicating that files are being retrieved from the server.

Figure 4.7. HTTP Setup Dialog

Next, the Welcome dialog appears.

Note

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

4.12. Welcome to Red Hat Enterprise Linux

The Welcome screen does not prompt you for any input. From this screen you can access the Release Notes for Red Hat Enterprise Linux 5.11 by clicking on the Release Notes button.

Click on the Next button to continue.

4.13. Language Selection

Using your mouse, select a language to use for the installation (refer to Figure 4.8, “Language Selection”).

The language you select here will become the default language for the operating system once it is installed. Selecting the appropriate language also helps target your time zone configuration later in the installation. The installation program tries to define the appropriate time zone based on what you specify on this screen.

Figure 4.8. Language Selection

Once you select the appropriate language, click Next to continue.

4.14. Keyboard Configuration

Using your mouse, select the correct layout type (for example, U.S. English) for the keyboard you would prefer to use for the installation and as the system default (refer to the figure below).

Once you have made your selection, click Next to continue.

Figure 4.9. Keyboard Configuration

Note

To change your keyboard layout type after you have completed the installation, use the Keyboard Configuration Tool.

Type the system-config-keyboard command in a shell prompt to launch the Keyboard Configuration Tool. If you are not root, it prompts you for the root password to continue.

4.15. Enter the Installation Number

Enter your Installation Number (refer to Figure 4.10, “Installation Number”). This number will determine the package selection set that is available to the installer. If you choose to skip entering the installation number you will be presented with a basic selection of packages to install later on.

Figure 4.10. Installation Number

4.16. Disk Partitioning Setup

Partitioning allows you to divide your hard drive into isolated sections, where each section behaves as its own hard drive. Partitioning is particularly useful if you run multiple operating systems. If you are not sure how you want your system to be partitioned, read Chapter 26, An Introduction to Disk Partitions for more information.

On this screen you can choose to create the default layout or choose to manual partition using the 'Create custom layout' option of Disk Druid.

The first three options allow you to perform an automated installation without having to partition your drive(s) yourself. If you do not feel comfortable with partitioning your system, it is recommended that you do not choose to create a custom layout and instead let the installation program partition for you.

You can configure an iSCSI target for installation, or disable a dmraid device from this screen by clicking on the 'Advanced storage configuration' button. For more information refer to Section 4.17, “ Advanced Storage Options ”.

Warning

The Update Agent downloads updated packages to /var/cache/yum/ by default. If you partition the system manually, and create a separate /var/ partition, be sure to create the partition large enough (3.0 GB or more) to download package updates.

Figure 4.11. Disk Partitioning Setup

If you choose to create a custom layout using Disk Druid, refer to Section 4.19, “Partitioning Your System”.

Warning

If you receive an error after the Disk Partitioning Setup phase of the installation saying something similar to:

"The partition table on device hda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive."

you may not have a partition table on that drive or the partition table on the drive may not be recognizable by the partitioning software used in the installation program.

Users who have used programs such as EZ-BIOS have experienced similar problems, causing data to be lost (assuming the data was not backed up before the installation began).

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

Important

To install Red Hat Enterprise Linux on a network device accessible through multiple paths, deselect all local storage in the Select the drive(s) to use for this installation window, and select a device labeled mapper/mpath instead.

Note that migrating the root file system of an existing Red Hat Enterprise Linux installation from single path storage to multipath storage is not supported. You must perform a new installation to move the root file system to a multipath storage device. Therefore you should plan your installation accordingly. See https://access.redhat.com/site/solutions/66501 for more information.

4.17. Advanced Storage Options

Figure 4.12. Advanced Storage Options

From this screen you can choose to disable a dmraid device, in which case the individual elements of the dmraid device will appear as separate hard drives. You can also choose to configure an iSCSI (SCSI over TCP/IP) target.

To configure an ISCSI target invoke the Configure ISCSI Parameters dialog by selecting Add ISCSI target and clicking on the Add Drive button. If a network connection is not already active, the installer prompts you to provide details of your network interface. Select your network interface from the drop-down menu, then either leave the Use dynamic IP configuration box checked, or uncheck it to enter the IP address of your system and the IP addresses of the gateway and nameserver on your network. Ensure that the Enable IPv4 box remains checked.

Figure 4.13. Enable network Interface

Fill in the details for the iSCSI target IP and provide a unique iSCSI initiator name to identify this system. If the iSCSI target uses Challenge Handshake Authentication Protocol (CHAP) for authentication, enter the CHAP username and password. If your environment uses 2-way CHAP (also called "Mutual CHAP"), also enter the reverse CHAP username and password. Click the Add target button to attempt connection to the ISCSI target using this information.

Figure 4.14. Configure ISCSI Parameters

Please note that you will be able to reattempt with a different ISCSI target IP should you enter it incorrectly, but in order to change the ISCSI initiator name you will need to restart the installation.

4.18. Create Default Layout

Create default layout allows you to have some control concerning what data is removed (if any) from your system. Your options are:

Remove all partitions on selected drives and create default layout — select this option to remove all partitions on your hard drive(s) (this includes partitions created by other operating systems such as Windows VFAT or NTFS partitions).
Warning
If you select this option, all data on the selected hard drive(s) is removed by the installation program. Do not select this option if you have information that you want to keep on the hard drive(s) where you are installing Red Hat Enterprise Linux.
Remove Linux partitions on selected drives and create default layout — select this option to remove only Linux partitions (partitions created from a previous Linux installation). This does not remove other partitions you may have on your hard drive(s) (such as VFAT or FAT32 partitions).
Use free space on selected drives and create default layout — select this option to retain your current data and partitions, assuming you have enough free space available on your hard drive(s).

Figure 4.15. Create Default Layout

Using your mouse, choose the storage drive(s) on which you want Red Hat Enterprise Linux to be installed. If you have two or more drives, you can choose which drive(s) should contain this installation. Unselected drives, and any data on them, are not touched.

Warning

It is always a good idea to back up any data that you have on your systems. For example, if you are upgrading or creating a dual-boot system, you should back up any data you wish to keep on your drive(s). Mistakes do happen and can result in the loss of all your data.

Note

If you have a RAID card, be aware that some BIOSes do not support booting from the RAID card. In cases such as these, the /boot/ partition must be created on a partition outside of the RAID array, such as on a separate hard drive. An internal hard drive is necessary to use for partition creation with problematic RAID cards.

A /boot/ partition is also necessary for software RAID setups.

If you have chosen to automatically partition your system, you should select Review and manually edit your /boot/ partition.

To review and make any necessary changes to the partitions created by automatic partitioning, select the Review option. After selecting Review and clicking Next to move forward, the partitions created for you in Disk Druid appear. You can make modifications to these partitions if they do not meet your needs.

Click Next once you have made your selections to proceed.

4.19. Partitioning Your System

If you chose one of the three automatic partitioning options and did not select Review, skip ahead to Section 4.21, “Network Configuration”.

If you chose one of the automatic partitioning options and selected Review, you can either accept the current partition settings (click Next), or modify the setup using Disk Druid, the manual partitioning tool.

Note

Please note that in the text mode installation it is not possible to work with LVM (Logical Volumes) beyond viewing the existing setup. LVM can only be set up using the graphical Disk Druid program in a graphical installation.

If you chose to create a custom layout, you must tell the installation program where to install Red Hat Enterprise Linux. This is done by defining mount points for one or more disk partitions in which Red Hat Enterprise Linux is installed. You may also need to create and/or delete partitions at this time.

Note

If you have not yet planned how to set up your partitions, refer to Chapter 26, An Introduction to Disk Partitions and Section 4.19.4, “Recommended Partitioning Scheme”. At a bare minimum, you need an appropriately-sized root partition, and a swap partition equal to twice the amount of RAM you have on the system. Itanium system users should have a /boot/efi/ partition of approximately 100 MB and of type FAT (VFAT), a swap partition of at least 512 MB, and an appropriately-sized root (/) partition.

Figure 4.16. Partitioning with Disk Druid on x86, AMD64, and Intel® 64 Systems

The partitioning tool used by the installation program is Disk Druid. With the exception of certain esoteric situations, Disk Druid can handle the partitioning requirements for a typical installation.

4.19.1. Graphical Display of Hard Drive(s)

Disk Druid offers a graphical representation of your hard drive(s).

Using your mouse, click once to highlight a particular field in the graphical display. Double-click to edit an existing partition or to create a partition out of existing free space.

Above the display, you can review the name of the drive (such as /dev/hda), its size (in MB), and its model as detected by the installation program.

4.19.2. Disk Druid's Buttons

These buttons control Disk Druid's actions. They are used to change the attributes of a partition (for example the file system type and mount point) and also to create RAID devices. Buttons on this screen are also used to accept the changes you have made, or to exit Disk Druid. For further explanation, take a look at each button in order:

New: Used to request a new partition. When selected, a dialog box appears containing fields (such as the mount point and size fields) that must be filled in.
Edit: Used to modify attributes of the partition currently selected in the Partitions section. Selecting Edit opens a dialog box. Some or all of the fields can be edited, depending on whether the partition information has already been written to disk.
You can also edit free space as represented in the graphical display to create a new partition within that space. Either highlight the free space and then select the Edit button, or double-click on the free space to edit it.
To make a RAID device, you must first create (or reuse existing) software RAID partitions. Once you have created two or more software RAID partitions, select Make RAID to join the software RAID partitions into a RAID device.
Delete: Used to remove the partition currently highlighted in the Current Disk Partitions section. You will be asked to confirm the deletion of any partition.
Reset: Used to restore Disk Druid to its original state. All changes made will be lost if you Reset the partitions.
RAID: Used to provide redundancy to any or all disk partitions. It should only be used if you have experience using RAID. To read more about RAID, see the Red Hat Enterprise Linux Deployment Guide.
To make a RAID device, you must first create software RAID partitions. Once you have created two or more software RAID partitions, select RAID to join the software RAID partitions into a RAID device.
LVM: Allows you to create an LVM logical volume. The role of LVM (Logical Volume Manager) is to present a simple logical view of underlying physical storage space, such as a hard drive(s). LVM manages individual physical disks — or to be more precise, the individual partitions present on them. It should only be used if you have experience using LVM. To read more about LVM, see the Red Hat Enterprise Linux Deployment Guide. Note, LVM is only available in the graphical installation program.
To create an LVM logical volume, you must first create partitions of type physical volume (LVM). Once you have created one or more physical volume (LVM) partitions, select LVM to create an LVM logical volume.

4.19.3. Partition Fields

Above the partition hierarchy are labels which present information about the partitions you are creating. The labels are defined as follows:

Device: This field displays the partition's device name.
Mount Point/RAID/Volume: A mount point is the location within the directory hierarchy at which a volume exists; the volume is "mounted" at this location. This field indicates where the partition is mounted. If a partition exists, but is not set, then you need to define its mount point. Double-click on the partition or click the Edit button.
Type: This field shows the partition's file system type (for example, ext2, ext3, or vfat).
Format: This field shows if the partition being created will be formatted.
Size (MB): This field shows the partition's size (in MB).
Start: This field shows the cylinder on your hard drive where the partition begins.
End: This field shows the cylinder on your hard drive where the partition ends.

Hide RAID device/LVM Volume Group members: Select this option if you do not want to view any RAID device or LVM Volume Group members that have been created.

4.19.4. Recommended Partitioning Scheme

4.19.4.1. Itanium systems

Unless you have a reason for doing otherwise, we recommend that you create the following partitions for Itanium systems:

A /boot/efi/ partition (100 MB minimum) — the partition mounted on /boot/efi/ contains all the installed kernels, the initrd images, and ELILO configuration files.
Warning
You must create a /boot/efi/ partition of type VFAT and at least 100 MB in size as the first primary partition.

A swap partition (at least 256 MB) — swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing.

In years past, the recommended amount of swap space increased linearly with the amount of RAM in the system. But because the amount of memory in modern systems has increased into the hundreds of gigabytes, it is now recognized that the amount of swap space that a system needs is a function of the memory workload running on that system. However, given that swap space is usually designated at install time, and that it can be difficult to determine beforehand the memory workload of a system, we recommend determining system swap using the following table.

Table 4.2. Recommended System Swap Space
Amount of RAM in the System	Recommended Amount of Swap Space
4GB of RAM or less	a minimum of 2GB of swap space
4GB to 16GB of RAM	a minimum of 4GB of swap space
16GB to 64GB of RAM	a minimum of 8GB of swap space
64GB to 256GB of RAM	a minimum of 16GB of swap space
256GB to 512GB of RAM	a minimum of 32GB of swap space

Note that you can obtain better performance by distributing swap space over multiple storage devices, particularly on systems with fast drives, controllers, and interfaces.

A root partition (3.0 GB - 5.0 GB) — this is where "/" (the root directory) is located. In this setup, all files (except those stored in /boot/efi) are on the root partition.
A 3.0 GB partition allows you to install a minimal installation, while a 5.0 GB root partition lets you perform a full installation, choosing all package groups.

4.19.4.2. x86, AMD64, and Intel® 64 systems

Unless you have a reason for doing otherwise, we recommend that you create the following partitions for x86, AMD64, and Intel® 64 systems:

Table 4.3. Recommended System Swap Space
Amount of RAM in the System	Recommended Amount of Swap Space
4GB of RAM or less	a minimum of 2GB of swap space
4GB to 16GB of RAM	a minimum of 4GB of swap space
16GB to 64GB of RAM	a minimum of 8GB of swap space
64GB to 256GB of RAM	a minimum of 16GB of swap space
256GB to 512GB of RAM	a minimum of 32GB of swap space

Note that you can obtain better performance by distributing swap space over multiple storage devices, particularly on systems with fast drives, controllers, and interfaces.

A /boot/ partition (250 MB) — the partition mounted on /boot/ contains the operating system kernel (which allows your system to boot Red Hat Enterprise Linux), along with files used during the bootstrap process. Due to limitations, creating a native ext3 partition to hold these files is required. For most users, a 250 MB boot partition is sufficient.
Note
If your hard drive is more than 1024 cylinders (and your system was manufactured more than two years ago), you may need to create a /boot/ partition if you want the / (root) partition to use all of the remaining space on your hard drive.
Note
If you have a RAID card, be aware that some BIOSes do not support booting from the RAID card. In cases such as these, the /boot/ partition must be created on a partition outside of the RAID array, such as on a separate hard drive.
A root partition (3.0 GB - 5.0 GB) — this is where "/" (the root directory) is located. In this setup, all files (except those stored in /boot) are on the root partition.
A 3.0 GB partition allows you to install a minimal installation, while a 5.0 GB root partition lets you perform a full installation, choosing all package groups.
A home partition (at least 100 MB) — for storing user data separately from system data. This will be a dedicated partition within a volume group for the /home directory. This will enable you to upgrade or reinstall Red Hat Enterprise Linux without erasing user data files.

Warning

Red Hat Enterprise Linux 5.11 does not support having a separate /var on a network filesystem (for example, NFS, iSCSI, or NBD) The /var directory contains critical data that must be read from or written to during the boot process before establishing network services.

However, you may have /var/spool, /var/www or other subdirectories on a separate network disk, just not the complete /var filesystem.

4.19.5. Adding Partitions

To add a new partition, select the New button. A dialog box appears (refer to Figure 4.17, “Creating a New Partition”).

Note

You must dedicate at least one partition for this installation, and optionally more. For more information, refer to Chapter 26, An Introduction to Disk Partitions.

Figure 4.17. Creating a New Partition

Mount Point: Enter the partition's mount point. For example, if this partition should be the root partition, enter /; enter /boot for the /boot partition, and so on. You can also use the pull-down menu to choose the correct mount point for your partition. For a swap partition the mount point should not be set - setting the filesystem type to swap is sufficient.
File System Type: Using the pull-down menu, select the appropriate file system type for this partition. For more information on file system types, refer to Section 4.19.5.1, “File System Types”.
Allowable Drives: This field contains a list of the hard disks installed on your system. If a hard disk's box is highlighted, then a desired partition can be created on that hard disk. If the box is not checked, then the partition will never be created on that hard disk. By using different checkbox settings, you can have Disk Druid place partitions where you need them, or let Disk Druid decide where partitions should go.
Size (MB): Enter the size (in megabytes) of the partition. Note, this field starts with 100 MB; unless changed, only a 100 MB partition will be created.
Additional Size Options: Choose whether to keep this partition at a fixed size, to allow it to "grow" (fill up the available hard drive space) to a certain point, or to allow it to grow to fill any remaining hard drive space available.
If you choose Fill all space up to (MB), you must give size constraints in the field to the right of this option. This allows you to keep a certain amount of space free on your hard drive for future use.
Force to be a primary partition: Select whether the partition you are creating should be one of the first four partitions on the hard drive. If unselected, the partition is created as a logical partition. Refer to Section 26.1.3, “Partitions within Partitions — An Overview of Extended Partitions”, for more information.
Encrypt: Choose whether to encrypt the partition so that the data stored on it cannot be accessed without a passphrase, even if the storage device is connected to another system. Refer to Chapter 29, Disk Encryption Guide for information on encryption of storage devices. If you select this option, the installer prompts you to provide a passphrase before it writes the partition to the disk.
OK: Select OK once you are satisfied with the settings and wish to create the partition.
Cancel: Select Cancel if you do not want to create the partition.

4.19.5.1. File System Types

Red Hat Enterprise Linux allows you to create different partition types, based on the file system they will use. The following is a brief description of the different file systems available, and how they can be utilized.

ext3 — The ext3 file system is based on the ext2 file system and has one main advantage — journaling. Using a journaling file system reduces time spent recovering a file system after a crash as there is no need to fsck ^[2] the file system. A maximum file system size of 16TB is supported for ext3. The ext3 file system is selected by default and is highly recommended.
ext2 — An ext2 file system supports standard Unix file types (regular files, directories, symbolic links, etc). It provides the ability to assign long file names, up to 255 characters.
physical volume (LVM) — Creating one or more physical volume (LVM) partitions allows you to create an LVM logical volume. LVM can improve performance when using physical disks. For more information regarding LVM, see the Red Hat Enterprise Linux Deployment Guide.
software RAID — Creating two or more software RAID partitions allows you to create a RAID device. For more information regarding RAID, see chapter RAID (Redundant Array of Independent Disks) in the Red Hat Enterprise Linux Deployment Guide.
swap — Swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing. See the Red Hat Enterprise Linux Deployment Guide for additional information.
vfat — The VFAT file system is a Linux file system that is compatible with Microsoft Windows long filenames on the FAT file system. This file system must be used for the /boot/efi/ partition on Itanium systems.

4.19.6. Editing Partitions

To edit a partition, select the Edit button or double-click on the existing partition.

Note

If the partition already exists on your disk, you can only change the partition's mount point. To make any other changes, you must delete the partition and recreate it.

4.19.7. Deleting a Partition

To delete a partition, highlight it in the Partitions section and click the Delete button. Confirm the deletion when prompted.

For further installation instructions for x86, AMD64, and Intel® 64 systems, skip to Section 4.20, “x86, AMD64, and Intel® 64 Boot Loader Configuration”.

For further installation instructions for Itanium systems, skip to Section 4.21, “Network Configuration”.

4.20. x86, AMD64, and Intel® 64 Boot Loader Configuration

To boot the system without boot media, you usually need to install a boot loader. A boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the operating system kernel software. The kernel, in turn, initializes the rest of the operating system.

GRUB (GRand Unified Bootloader), which is installed by default, is a very powerful boot loader. GRUB can load a variety of free operating systems, as well as proprietary operating systems with chain-loading (the mechanism for loading unsupported operating systems, such as DOS or Windows, by loading another boot loader).

Figure 4.18. Boot Loader Configuration

If you do not want to install GRUB as your boot loader, click Change boot loader, where you can choose not to install a boot loader at all.

If you already have a boot loader that can boot Red Hat Enterprise Linux and do not want to overwrite your current boot loader, choose Do not install a boot loader by clicking on the Change boot loader button.

Warning

If you choose not to install GRUB for any reason, you will not be able to boot the system directly, and you must use another boot method (such as a commercial boot loader application). Use this option only if you are sure you have another way of booting the system!

Every bootable partition is listed, including partitions used by other operating systems. The partition holding the system's root file system has a Label of Red Hat Enterprise Linux (for GRUB). Other partitions may also have boot labels. To add or change the boot label for other partitions that have been detected by the installation program, click once on the partition to select it. Once selected, you can change the boot label by clicking the Edit button.

Select Default beside the preferred boot partition to choose your default bootable OS. You cannot move forward in the installation unless you choose a default boot image.

Note

The Label column lists what you must enter at the boot prompt, in non-graphical boot loaders, in order to boot the desired operating system.

Once you have loaded the GRUB boot screen, use the arrow keys to choose a boot label or type e for edit. You are presented with a list of items in the configuration file for the boot label you have selected.

Boot loader passwords provide a security mechanism in an environment where physical access to your server is available.

If you are installing a boot loader, you should create a password to protect your system. Without a boot loader password, users with access to your system can pass options to the kernel which can compromise your system security. With a boot loader password in place, the password must first be entered before selecting any non-standard boot options. However, it is still possible for someone with physical access to the machine to boot from a diskette, CD-ROM, or USB media if the BIOS supports it. Security plans which include boot loader passwords should also address alternate boot methods.

If you choose to use a boot loader password to enhance your system security, be sure to select the checkbox labeled Use a boot loader password.

Once selected, enter a password and confirm it.

Important

When selecting a GRUB password, be aware that GRUB recognizes only the QWERTY keyboard layout, regardless of the keyboard actually attached to the system. If you use a keyboard with a significantly different layout, it might be more effective to memorize a pattern of keystrokes rather than the word that the pattern produces.

To configure more advanced boot loader options, such as changing the drive order or passing options to the kernel, be sure Configure advanced boot loader options is selected before clicking Next.

Important

If you are installing Red Hat Enterprise Linux on a network device accessible through multiple paths, ensure that you select Configure advanced boot loader options before you click Next.

4.20.1. Advanced Boot Loader Configuration

Now that you have chosen which boot loader to install, you can also determine where you want the boot loader to be installed. You may install the boot loader in one of two places:

The master boot record (MBR) — This is the recommended place to install a boot loader, unless the MBR already starts another operating system loader, such as System Commander. The MBR is a special area on your hard drive that is automatically loaded by your computer's BIOS, and is the earliest point at which the boot loader can take control of the boot process. If you install it in the MBR, when your machine boots, GRUB presents a boot prompt. You can then boot Red Hat Enterprise Linux or any other operating system that you have configured the boot loader to boot.
The first sector of your boot partition — This is recommended if you are already using another boot loader on your system. In this case, your other boot loader takes control first. You can then configure that boot loader to start GRUB, which then boots Red Hat Enterprise Linux.

Figure 4.19. Boot Loader Installation

Note

If you have a RAID card, be aware that some BIOSes do not support booting from the RAID card. In cases such as these, the boot loader should not be installed on the MBR of the RAID array. Rather, the boot loader should be installed on the MBR of the same drive as the /boot/ partition was created.

If your system only uses Red Hat Enterprise Linux, you should choose the MBR.

Click the Change Drive Order button if you would like to rearrange the drive order or if your BIOS does not return the correct drive order. Changing the drive order may be useful if you have multiple SCSI adapters, or both SCSI and IDE adapters, and you want to boot from the SCSI device.

The Force LBA32 (not normally required) option allows you to exceed the 1024 cylinder limit for the /boot/ partition. If you have a system which supports the LBA32 extension for booting operating systems above the 1024 cylinder limit, and you want to place your /boot/ partition above cylinder 1024, you should select this option.

Note

While partitioning your hard drive, keep in mind that the BIOS in some older systems cannot access more than the first 1024 cylinders on a hard drive. If this is the case, leave enough room for the /boot Linux partition on the first 1024 cylinders of your hard drive to boot Linux. The other Linux partitions can be after cylinder 1024.

In parted, 1024 cylinders equals 528MB. For more information, refer to:

http://www.pcguide.com/ref/hdd/bios/sizeMB504-c.html

To add default options to the boot command, enter them into the Kernel parameters field. Any options you enter are passed to the Linux kernel every time it boots.

Important

If you are installing Red Hat Enterprise Linux on a network device accessible through multiple paths, ensure that GRUB is installed on the MBR of /dev/mapper/mpath0.

4.20.2. Rescue Mode

Rescue mode provides the ability to boot a small Red Hat Enterprise Linux environment entirely from boot media or some other boot method instead of the system's hard drive. There may be times when you are unable to get Red Hat Enterprise Linux running completely enough to access files on your system's hard drive. Using rescue mode, you can access the files stored on your system's hard drive, even if you cannot actually run Red Hat Enterprise Linux from that hard drive. If you need to use rescue mode, try the following method:

Using the CD-ROM to boot an x86, AMD64, or Intel® 64 system, type linux rescue at the installation boot prompt. Itanium users should type elilo linux rescue to enter rescue mode.

For additional information, see the Red Hat Enterprise Linux Deployment Guide.

4.20.3. Alternative Boot Loaders

If you do not wish to use a boot loader, you have several alternatives:

LOADLIN: You can load Linux from MS-DOS. Unfortunately, this requires a copy of the Linux kernel (and an initial RAM disk, if you have a SCSI adapter) to be available on an MS-DOS partition. The only way to accomplish this is to boot your Red Hat Enterprise Linux system using some other method (for example, from a boot CD-ROM) and then copy the kernel to an MS-DOS partition. LOADLIN is available from
ftp://metalab.unc.edu/pub/Linux/system/boot/dualboot/
and associated mirror sites.
SYSLINUX: SYSLINUX is an MS-DOS program very similar to LOADLIN. It is also available from
ftp://metalab.unc.edu/pub/Linux/system/boot/loaders/
and associated mirror sites.
Commercial boot loaders: You can load Linux using commercial boot loaders. For example, System Commander and Partition Magic are able to boot Linux (but still require GRUB to be installed in your Linux root partition).

Note

Boot loaders such as LOADLIN and System Commander are considered to be third-party boot loaders and are not supported by Red Hat.

4.20.4. SMP Motherboards and GRUB

In previous versions of Red Hat Enterprise Linux there were two different kernel versions, a uniprocessor version and an SMP version. In Red Hat Enterprise Linux 5.11 the kernel is SMP-enabled by default and will take advantage of multiple core, hyperthreading, and multiple CPU capabilities when they are present. This same kernel can run on single CPUs with a single core and no hyperthreading.

4.21. Network Configuration

If you do not have a network device, this screen does not appear during your installation and you should advance to Section 4.22, “Time Zone Configuration”.

Figure 4.20. Network Configuration

The installation program automatically detects any network devices you have and displays them in the Network Devices list.

When you have selected a network device, click Edit. From the Edit Interface dialog, you can choose to configure the IP address and Netmask (for IPv4 - Prefix for IPv6) of the device to use DHCP or to use static settings. If you do not have DHCP client access or you are unsure what to provide here, contact your network administrator.

Figure 4.21. Editing a Network Device

Note

Do not use the numbers as seen in this sample configuration. These values will not work for your own network configuration. If you are not sure what values to enter, contact your network administrator for assistance.

If you have a hostname (fully qualified domain name) for the network device, you can choose to have DHCP (Dynamic Host Configuration Protocol) automatically detect it or you can manually enter the hostname in the field provided.

Finally, if you entered the IP and Netmask information manually, you may also enter the Gateway address and the Primary and Secondary DNS addresses.

Note

Even if your computer is not part of a network, you can enter a hostname for your system. If you do not take this opportunity to enter a name, your system will be known as localhost.

Note

To change your network configuration after you have completed the installation, use the Network Administration Tool.

Type the system-config-network command in a shell prompt to launch the Network Administration Tool. If you are not root, it prompts you for the root password to continue.

4.22. Time Zone Configuration

Set your time zone by selecting the city closest to your computer's physical location. Click on the map to zoom in to a particular geographical region of the world.

From here there are two ways for you to select your time zone:

Using your mouse, click on the interactive map to select a specific city (represented by a yellow dot). A red X appears indicating your selection.
You can also scroll through the list at the bottom of the screen to select your time zone. Using your mouse, click on a location to highlight your selection.

Select System Clock uses UTC if you know that your system is set to UTC.

Note

To change your time zone configuration after you have completed the installation, use the Time and Date Properties Tool.

Type the system-config-date command in a shell prompt to launch the Time and Date Properties Tool. If you are not root, it prompts you for the root password to continue.

To run the Time and Date Properties Tool as a text-based application, use the command timeconfig.

4.23. Set Root Password

Setting up a root account and password is one of the most important steps during your installation. Your root account is similar to the administrator account used on Windows NT machines. The root account is used to install packages, upgrade RPMs, and perform most system maintenance. Logging in as root gives you complete control over your system.

Note

The root user (also known as the superuser) has complete access to the entire system; for this reason, logging in as the root user is best done only to perform system maintenance or administration.

Figure 4.22. Root Password

Use the root account only for system administration. Create a non-root account for your general use and su - to root when you need to fix something quickly. These basic rules minimize the chances of a typo or an incorrect command doing damage to your system.

Note

To become root, type su - at the shell prompt in a terminal window and then press Enter. Then, enter the root password and press Enter.

The installation program prompts you to set a root password^[3] for your system. You cannot proceed to the next stage of the installation process without entering a root password.

The root password must be at least six characters long; the password you type is not echoed to the screen. You must enter the password twice; if the two passwords do not match, the installation program asks you to enter them again.

You should make the root password something you can remember, but not something that is easy for someone else to guess. Your name, your phone number, qwerty, password, root, 123456, and anteater are all examples of bad passwords. Good passwords mix numerals with upper and lower case letters and do not contain dictionary words: Aard387vark or 420BMttNT, for example. Remember that the password is case-sensitive. If you write down your password, keep it in a secure place. However, it is recommended that you do not write down this or any password you create.

Note

Do not use one of the example passwords offered in this manual. Using one of these passwords could be considered a security risk.

Note

To change your root password after you have completed the installation, use the Root Password Tool.

Type the system-config-rootpassword command in a shell prompt to launch the Root Password Tool. If you are not root, it prompts you for the root password to continue.

4.24. Package Group Selection

Now that you have made most of the choices for your installation, you are ready to confirm the default package selection or customize packages for your system.

The Package Installation Defaults screen appears and details the default package set for your Red Hat Enterprise Linux installation. This screen varies depending on the version of Red Hat Enterprise Linux you are installing.

If you choose to accept the current package list, skip ahead to Section 4.25, “Preparing to Install”.

To customize your package set further, select the Customize now option on the screen. Clicking Next takes you to the Package Group Selection screen.

You can select package groups, which group components together according to function (for example, X Window System and Editors), individual packages, or a combination of the two.

Note

Users of Itanium systems who want support for developing or running 32-bit applications are encouraged to select the Compatibility Arch Support and Compatibility Arch Development Support packages to install architecture specific support for their systems.

To select a component, click on the checkbox beside it (refer to Figure 4.23, “Package Group Selection”).

Figure 4.23. Package Group Selection

Select each component you wish to install.

Once a package group has been selected, if optional components are available you can click on Optional packages to view which packages are installed by default, and to add or remove optional packages from that group. If there are no optional components this button will be disabled.

Figure 4.24. Package Group Details

4.25. Preparing to Install

4.25.1. Prepare to Install

A screen preparing you for the installation of Red Hat Enterprise Linux now appears.

For your reference, a complete log of your installation can be found in /root/install.log once you reboot your system.

Warning

If, for some reason, you would rather not continue with the installation process, this is your last opportunity to safely cancel the process and reboot your machine. Once you press the Next button, partitions are written and packages are installed. If you wish to abort the installation, you should reboot now before any existing information on any hard drive is rewritten.

To cancel this installation process, press your computer's Reset button or use the Control+Alt+Delete key combination to restart your machine.

4.26. Installing Packages

At this point there is nothing left for you to do until all the packages have been installed. How quickly this happens depends on the number of packages you have selected and your computer's speed.

4.27. Installation Complete

Congratulations! Your Red Hat Enterprise Linux installation is now complete!

The installation program prompts you to prepare your system for reboot. Remember to remove any installation media if it is not ejected automatically upon reboot.

After your computer's normal power-up sequence has completed, the graphical boot loader prompt appears at which you can do any of the following things:

Press Enter — causes the default boot entry to be booted.
Select a boot label, followed by Enter — causes the boot loader to boot the operating system corresponding to the boot label.
Do nothing — after the boot loader's timeout period, (by default, five seconds) the boot loader automatically boots the default boot entry.

Do whatever is appropriate to boot Red Hat Enterprise Linux. One or more screens of messages should scroll by. Eventually, a login: prompt or a GUI login screen (if you installed the X Window System and chose to start X automatically) appears.

The first time you start your Red Hat Enterprise Linux system in run level 5 (the graphical run level), the Setup Agent is presented, which guides you through the Red Hat Enterprise Linux configuration. Using this tool, you can set your system time and date, install software, register your machine with Red Hat Network, and more. The Setup Agent lets you configure your environment at the beginning, so that you can get started using your Red Hat Enterprise Linux system quickly.

For information on registering your Red Hat Enterprise Linux subscription, refer to Chapter 25, Register Your System and Apply Subscriptions.

4.28. Itanium Systems — Booting Your Machine and Post-Installation Setup

This section describes how to boot your Itanium into Red Hat Enterprise Linux and how to set your EFI console variables so that Red Hat Enterprise Linux is automatically booted when the machine is powered on.

After you reboot your system at the end of the installation program, type the following command to boot into Red Hat Enterprise Linux:

elilo

After you type elilo, the default kernel listed in the /boot/efi/elilo.conf configuration file is loaded. (The first kernel listed in the file is the default.)

If you want to load a different kernel, type the label name of the kernel from the file /boot/efi/elilo.conf after the elilo command. For example, to load the kernel named linux, type:

elilo linux

If you do not know the names of the installed kernels, you can view the /boot/efi/elilo.conf file in EFI with the following instructions:

At the Shell> prompt, change devices to the system partition (mounted as /boot/efi in Linux). For example, if fs0 is the system boot partition, type fs0: at the EFI Shell prompt.
Type ls at the fs0:\> to make sure you are in the correct partition.
Then type:
```
Shell>type elilo.conf
```
This command displays the contents of the configuration file. Each stanza contains a line beginning with label followed by a label name for that kernel. The label name is what you type after elilo to boot the different kernels.

4.28.1. Post-Installation Boot Loader Options

In addition to specifying a kernel to load, you can also enter other boot options such as single for single user mode or mem=1024M to force Red Hat Enterprise Linux to use 1024 MB of memory. To pass options to the boot loader, enter the following at the EFI Shell prompt (replace linux with the label name of the kernel you want to boot and option with the boot options you want to pass to the kernel):

elilo linux option

4.28.2. Booting Red Hat Enterprise Linux Automatically

After installing Red Hat Enterprise Linux you can type elilo and any boot options at the EFI Shell prompt each time you wish to boot your Itanium system. However, if you wish to configure your system to boot into Red Hat Enterprise Linux automatically, you need to configure the EFI Boot Manager.

To configure the EFI Boot Manager (may vary slightly depending on your hardware):

Boot the Itanium system and choose Boot option maintenance menu from the EFI Boot Manager menu.
Choose Add a Boot Option from the Main Menu.
Select the system partition that is mounted as /boot/efi/ in Linux.
Select the elilo.efi file.
At the Enter New Description: prompt, type Red Hat Enterprise Linux 5, or any name that you want to appear on the EFI Boot Manager menu.
At the Enter Boot Option Data Type: prompt, enter N for No Boot Option if you do not want to pass options to the ELILO boot loader. This option works for most cases. If you want to pass options to the boot loader, you can configure it in the /boot/efi/elilo.conf configuration file instead.
Answer Yes to the Save changes to NVRAM prompt. This returns you to the EFI Boot Maintenance Manager menu.
Next, you want to make the Red Hat Enterprise Linux 5 menu item the default. A list of boot options appears. Move the Red Hat Enterprise Linux 5 menu item up to the top of the list by selecting it with the arrow keys and pressing the u key to move it up the list. You can move items down the list by selecting it and pressing the d key. After changing the boot order, choose Save changes to NVRAM. Choose Exit to return to the Main Menu.
Optionally, you can change the boot timeout value by choosing Set Auto Boot TimeOut => Set Timeout Value from the Main Menu.
Return to the EFI Boot Manager by selecting Exit.

4.28.2.1. Using a Startup Script

It is recommended that you configure the ELILO Boot Manager to boot Red Hat Enterprise Linux automatically. However, if you require additional commands to be executed before starting the ELILO boot loader, you can create a startup script named startup.nsh. The last command should be elilo to boot into Linux.

The startup.nsh script should be in the /boot/efi partition (/boot/efi/startup.nsh) and contain the following text:

echo -off your set of commands elilo

If you want to pass options to the boot loader (refer to Section 4.28.1, “Post-Installation Boot Loader Options”) add them after elilo.

You can either create this file after booting into Red Hat Enterprise Linux or use the editor built into the EFI shell. To use the EFI shell, at the Shell> prompt, change devices to the system partition (mounted as /boot/efi in Linux). For example, if fs0 is the system boot partition, type fs0: at the EFI Shell prompt. Type ls to make sure you are in the correct partition. Then type edit startup.nsh. Type the contents of the file and save it.

The next time the system boots, EFI detects the startup.nsh file and use it to boot the system. To stop EFI from loading the file, type Ctrl+c . This aborts the process, and returns you to the EFI shell prompt.

^[2] The fsck application is used to check the file system for metadata consistency and optionally repair one or more Linux file systems.

^[3] A root password is the administrative password for your Red Hat Enterprise Linux system. You should only log in as root when needed for system maintenance. The root account does not operate within the restrictions placed on normal user accounts, so changes made as root can have implications for your entire system.

Chapter 5. Removing Red Hat Enterprise Linux

To uninstall Red Hat Enterprise Linux from your x86-based system, you must remove the Red Hat Enterprise Linux boot loader information from your master boot record (MBR).

Note

It is always a good idea to backup any data that you have on your system(s). Mistakes do happen and can result in the loss all of your data.

In DOS and Windows, use the Windows fdisk utility to create a new MBR with the undocumented flag /mbr. This ONLY rewrites the MBR to boot the primary DOS partition. The command should look like the following:

fdisk /mbr

If you need to remove Linux from a hard drive and have attempted to do this with the default DOS (Windows) fdisk, you will experience the Partitions exist but they do not exist problem. The best way to remove non-DOS partitions is with a tool that understands partitions other than DOS.

To begin, insert the Red Hat Enterprise Linux CD #1 and boot your system. Once you have booted off the CD, a boot prompt appears. At the boot prompt, type: linux rescue. This starts the rescue mode program.

You are prompted for your keyboard and language requirements. Enter these values as you would during the installation of Red Hat Enterprise Linux.

Next, a screen appears telling you that the program attempts to find a Red Hat Enterprise Linux install to rescue. Select Skip on this screen.

After selecting Skip, you are given a command prompt where you can access the partitions you would like to remove.

First, type the command list-harddrives. This command lists all hard drives on your system that are recognizable by the installation program, as well as their sizes in megabytes.

Warning

Be careful to remove only the necessary Red Hat Enterprise Linux partitions. Removing other partitions could result in data loss or a corrupted system environment.

To remove partitions, use the partitioning utility parted. Start parted, where /dev/hda is the device on which to remove the partition:

parted /dev/hda

Using the print command, view the current partition table to determine the minor number of the partition to remove:

print

The print command also displays the partition's type (such as linux-swap, ext2, ext3, and so on). Knowing the type of the partition helps you in determining whether to remove the partition.

Remove the partition with the command rm. For example, to remove the partition with minor number 3:

rm 3

Important

The changes start taking place as soon as you press [Enter], so review the command before committing to it.

After removing the partition, use the print command to confirm that it is removed from the partition table.

Once you have removed the Linux partitions and made all of the changes you need to make, type quit to quit parted.

After quitting parted, type exit at the boot prompt to exit rescue mode and reboot your system, instead of continuing with the installation. The system should reboot automatically. If it does not, you can reboot your computer using Control+Alt+Delete .

Chapter 6. Troubleshooting Installation on an Intel® or AMD System

This appendix discusses some common installation problems and their solutions.

6.1. You are Unable to Boot Red Hat Enterprise Linux

6.1.1. Are You Unable to Boot With Your RAID Card?

If you have performed an installation and cannot boot your system properly, you may need to reinstall and create your partitions differently.

Some BIOSes do not support booting from RAID cards. At the end of an installation, a text-based screen showing the boot loader prompt (for example, GRUB: ) and a flashing cursor may be all that appears. If this is the case, you must repartition your system.

Whether you choose automatic or manual partitioning, you must install your /boot partition outside of the RAID array, such as on a separate hard drive. An internal hard drive is necessary to use for partition creation with problematic RAID cards.

You must also install your preferred boot loader (GRUB or LILO) on the MBR of a drive that is outside of the RAID array. This should be the same drive that hosts the /boot/ partition.

Once these changes have been made, you should be able to finish your installation and boot the system properly.

6.1.2. Is Your System Displaying Signal 11 Errors?

A signal 11 error, commonly know as a segmentation fault, means that the program accessed a memory location that was not assigned to it. A signal 11 error may be due to a bug in one of the software programs that is installed, or faulty hardware.

If you receive a fatal signal 11 error during your installation, it is probably due to a hardware error in memory on your system's bus. Like other operating systems, Red Hat Enterprise Linux places its own demands on your system's hardware. Some of this hardware may not be able to meet those demands, even if they work properly under another OS.

Ensure that you have the latest installation updates and images from Red Hat. Review the online errata to see if newer versions are available. If the latest images still fail, it may be due to a problem with your hardware. Commonly, these errors are in your memory or CPU-cache. A possible solution for this error is turning off the CPU-cache in the BIOS, if your system supports this. You could also try to swap your memory around in the motherboard slots to check if the problem is either slot or memory related.

Another option is to perform a media check on your installation CD-ROMs. The Red Hat Enterprise Linux installation program has the ability to test the integrity of the installation media. It works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Red Hat recommends that you test all installation media before starting the installation process, and before reporting any installation-related bugs (many of the bugs reported are actually due to improperly-burned CDs). To use this test, type the following command at the boot: or yaboot: prompt (prepend with elilo for Itanium systems):

	linux mediacheck

For more information concerning signal 11 errors, refer to:

	http://www.bitwizard.nl/sig11/

6.2. Trouble Beginning the Installation

6.2.1. Problems with Booting into the Graphical Installation

There are some video cards that have trouble booting into the graphical installation program. If the installation program does not run using its default settings, it tries to run in a lower resolution mode. If that still fails, the installation program attempts to run in text mode.

One possible solution is to try using the resolution= boot option. This option may be most helpful for laptop users. Another solution to try is the driver= option to specify the driver that should be loaded for your video card. If this works, it should be reported as a bug as the installer has failed to autodetect your videocard. Refer to Chapter 8, Additional Boot Options for Intel® and AMD Systems for more information on boot options.

Note

To disable frame buffer support and allow the installation program to run in text mode, try using the nofb boot option. This command may be necessary for accessibility with some screen reading hardware.

6.3. Trouble During the Installation

6.3.1. `No devices found to install Red Hat Enterprise Linux` Error Message

If you receive an error message stating No devices found to install Red Hat Enterprise Linux, there is probably a SCSI controller that is not being recognized by the installation program.

Check your hardware vendor's website to determine if a driver diskette image is available that fixes your problem. For more general information on driver diskettes, refer to Chapter 7, Updating drivers during installation on Intel and AMD systems.

You can also refer to the Red Hat Hardware Compatibility List, available online at:

http://hardware.redhat.com/hcl/

6.3.2. Saving Traceback Messages Without a Diskette Drive

If you receive a traceback error message during installation, you can usually save it to a diskette.

If you do not have a diskette drive available in your system, you can scp the error message to a remote system.

When the traceback dialog appears, the traceback error message is automatically written to a file named /tmp/anacdump.txt. Once the dialog appears, switch over to a new tty (virtual console) by pressing the keys Ctrl+Alt+F2 and scp the message written to /tmp/anacdump.txt to a known working remote system.

6.3.3. Trouble with Partition Tables

If you receive an error after the Disk Partitioning Setup (Section 4.16, “Disk Partitioning Setup”) phase of the installation saying something similar to

The partition table on device hda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive.

you may not have a partition table on that drive or the partition table on the drive may not be recognizable by the partitioning software used in the installation program.

Users who have used programs such as EZ-BIOS have experienced similar problems, causing data to be lost (assuming the data was not backed up before the installation began) that could not be recovered.

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

6.3.4. Using Remaining Space

You have a swap and a / (root) partition created, and you have selected the root partition to use the remaining space, but it does not fill the hard drive.

If your hard drive is more than 1024 cylinders, you must create a /boot partition if you want the / (root) partition to use all of the remaining space on your hard drive.

6.3.5. Other Partitioning Problems

If you are using Disk Druid to create partitions, but cannot move to the next screen, you probably have not created all the partitions necessary for Disk Druid's dependencies to be satisfied.

You must have the following partitions as a bare minimum:

A / (root) partition
A <swap> partition of type swap

Note

When defining a partition's type as swap, do not assign it a mount point. Disk Druid automatically assigns the mount point for you.

6.3.6. Other Partitioning Problems for Itanium System Users

If you are using Disk Druid to create partitions, but cannot move to the next screen, you probably have not created all the partitions necessary for Disk Druid's dependencies to be satisfied.

You must have the following partitions as a bare minimum:

A /boot/efi/ partition of type VFAT
A / (root) partition
A <swap> partition of type swap

Note

When defining a partition's type as swap, you do not have to assign it a mount point. Disk Druid automatically assigns the mount point for you.

6.3.7. Are You Seeing Python Errors?

During some upgrades or installations of Red Hat Enterprise Linux, the installation program (also known as anaconda) may fail with a Python or traceback error. This error may occur after the selection of individual packages or while trying to save the upgrade log in the /tmp/directory. The error may look similar to:

Traceback (innermost last):
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/iw/progress_gui.py", line 20, in run
rc = self.todo.doInstall ()    
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/todo.py", line 1468, in doInstall 
self.fstab.savePartitions ()    
File "fstab.py", line 221, in savePartitions      
sys.exit(0)  
SystemExit: 0   
Local variables in innermost frame:  
self: <fstab.GuiFstab instance at 8446fe0>  
sys: <module 'sys' (built-in)>  
ToDo object:  (itodo  ToDo  p1  (dp2  S'method'  p3  (iimage  CdromInstallMethod  
p4  (dp5  S'progressWindow'  p6   <failed>

This error occurs in some systems where links to /tmp/ are symbolic to other locations or have been changed since creation. These symbolic or changed links are invalid during the installation process, so the installation program cannot write information and fails.

If you experience such an error, first try to download any available errata for anaconda. Errata can be found at:

http://www.redhat.com/support/errata/

The anaconda website may also be a useful reference and can be found online at:

http://fedoraproject.org/wiki/Anaconda

You can also search for bug reports related to this problem. To search Red Hat's bug tracking system, go to:

http://bugzilla.redhat.com/bugzilla/

Finally, if you are still facing problems related to this error, register your product and contact our support team. To register your product, go to:

http://www.redhat.com/apps/activate/

6.4. Problems After Installation

6.4.1. Trouble With the Graphical GRUB Screen on an x86-based System?

If you are experiencing problems with GRUB, you may need to disable the graphical boot screen. To do this, become the root user and edit the /boot/grub/grub.conf file.

Within the grub.conf file, comment out the line which begins with splashimage by inserting the # character at the beginning of the line.

Press Enter to exit the editing mode.

Once the boot loader screen has returned, type b to boot the system.

Once you reboot, the grub.conf file is reread and any changes you have made take effect.

You may re-enable the graphical boot screen by uncommenting (or adding) the above line back into the grub.conf file.

6.4.2. Booting into a Graphical Environment

If you have installed the X Window System but are not seeing a graphical desktop environment once you log into your Red Hat Enterprise Linux system, you can start the X Window System graphical interface using the command startx.

Once you enter this command and press Enter, the graphical desktop environment is displayed.

Note, however, that this is just a one-time fix and does not change the log in process for future log ins.

To set up your system so that you can log in at a graphical login screen, you must edit one file, /etc/inittab, by changing just one number in the runlevel section. When you are finished, reboot the computer. The next time you log in, you are presented with a graphical login prompt.

Open a shell prompt. If you are in your user account, become root by typing the su command.

Now, type gedit /etc/inittab to edit the file with gedit. The file /etc/inittab opens. Within the first screen, a section of the file which looks like the following appears:

# Default runlevel. The runlevels used by RHS are: 
#   0 - halt (Do NOT set initdefault to this) 
#   1 - Single user mode 
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking) 
#   3 - Full multiuser mode 
#   4 - unused 
#   5 - X11 
#   6 - reboot (Do NOT set initdefault to this) 
#  id:3:initdefault:

To change from a console to a graphical login, you should change the number in the line id:3:initdefault: from a 3 to a 5.

Warning

Change only the number of the default runlevel from 3 to 5.

Your changed line should look like the following:

	 id:5:initdefault:

When you are satisfied with your change, save and exit the file using the Ctrl+Q keys. A window appears and asks if you would like to save the changes. Click Save.

The next time you log in after rebooting your system, you are presented with a graphical login prompt.

6.4.3. Problems with the X Window System (GUI)

If you are having trouble getting X (the X Window System) to start, you may not have installed it during your installation.

If you want X, you can either install the packages from the Red Hat Enterprise Linux CD-ROMs or perform an upgrade.

If you elect to upgrade, select the X Window System packages, and choose GNOME, KDE, or both, during the upgrade package selection process.

6.4.4. Problems with the X Server Crashing and Non-Root Users

If you are having trouble with the X server crashing when anyone other than root logs in, you may have a full file system (or, a lack of available hard drive space).

To verify that this is the problem you are experiencing, run the following command:

df -h

The df command should help you diagnose which partition is full. For additional information about df and an explanation of the options available (such as the -h option used in this example), refer to the df man page by typing man df at a shell prompt.

A key indicator is 100% full or a percentage above 90% or 95% on a partition. The /home/ and /tmp/ partitions can sometimes fill up quickly with user files. You can make some room on that partition by removing old files. After you free up some disk space, try running X as the user that was unsuccessful before.

6.4.5. Problems When You Try to Log In

If you did not create a user account in the Setup Agent, log in as root and use the password you assigned to root.

If you cannot remember your root password, boot your system as linux single.

Itanium users must enter boot commands with elilo followed by the boot command.

If you are using an x86-based system and GRUB is your installed boot loader, type e for edit when the GRUB boot screen has loaded. You are presented with a list of items in the configuration file for the boot label you have selected.

Choose the line that starts with kernel and type e to edit this boot entry.

At the end of the kernel line, add:

	single

Press Enter to exit edit mode.

Once the boot loader screen has returned, type b to boot the system.

Once you have booted into single user mode and have access to the # prompt, you must type passwd root, which allows you to enter a new password for root. At this point you can type shutdown -r now to reboot the system with the new root password.

If you cannot remember your user account password, you must become root. To become root, type su - and enter your root password when prompted. Then, type passwd <username>. This allows you to enter a new password for the specified user account.

If the graphical login screen does not appear, check your hardware for compatibility issues. The Hardware Compatibility List can be found at:

	http://hardware.redhat.com/hcl/

6.4.6. Is Your RAM Not Being Recognized?

Sometimes, the kernel does not recognize all of your memory (RAM). You can check this with the cat /proc/meminfo command.

Verify that the displayed quantity is the same as the known amount of RAM in your system. If they are not equal, add the following line to the /boot/grub/grub.conf:

mem=xxM

Replace xx with the amount of RAM you have in megabytes.

In /boot/grub/grub.conf, the above example would look similar to the following:

# NOTICE: You have a /boot partition. This means that 
#  all kernel paths are relative to /boot/ 
default=0 
timeout=30 
splashimage=(hd0,0)/grub/splash.xpm.gz 
title Red Hat Enterprise Linux (2.6.9-5.EL)         
root (hd0,0)         
kernel /vmlinuz-2.6.9-5.EL ro root=/dev/hda3 mem=128M

Once you reboot, the changes made to grub.conf are reflected on your system.

Once you have loaded the GRUB boot screen, type e for edit. You are presented with a list of items in the configuration file for the boot label you have selected.

Choose the line that starts with kernel and type e to edit this boot entry.

At the end of the kernel line, add

mem=xxM

where xx equals the amount of RAM in your system.

Press Enter to exit edit mode.

Once the boot loader screen has returned, type b to boot the system.

Itanium users must enter boot commands with elilo followed by the boot command.

Remember to replace xx with the amount of RAM in your system. Press Enter to boot.

6.4.7. Your Printer Does Not Work

If you are not sure how to set up your printer or are having trouble getting it to work properly, try using the Printer Configuration Tool.

Type the system-config-printer command at a shell prompt to launch the Printer Configuration Tool. If you are not root, it prompts you for the root password to continue.

6.4.8. Problems with Sound Configuration

If, for some reason, you do not hear sound and know that you do have a sound card installed, you can run the Sound Card Configuration Tool (system-config-soundcard) utility.

To use the Sound Card Configuration Tool, choose Main Menu => System => Administration => Soundcard Detection in GNOME, or Main Menu => Administration => Soundcard Detection in KDE. A small text box pops up prompting you for your root password.

You can also type the system-config-soundcard command at a shell prompt to launch the Sound Card Configuration Tool. If you are not root, it prompts you for the root password to continue.

If the Sound Card Configuration Tool does not work (if the sample does not play and you still do not have audio sounds), it is likely that your sound card is not yet supported in Red Hat Enterprise Linux.

6.4.9. Apache-based `httpd` service/Sendmail Hangs During Startup

If you are having trouble with the Apache-based httpd service or Sendmail hanging at startup, make sure the following line is in the /etc/hosts file:

127.0.0.1  localhost.localdomain  localhost

Chapter 7. Updating drivers during installation on Intel and AMD systems

In most cases, Red Hat Enterprise Linux already includes drivers for the devices that make up your system. However, if your system contains hardware that has been released very recently, drivers for this hardware might not yet be included. Sometimes, a driver update that provides support for a new device might be available from Red Hat or your hardware vendor as a ISO image file or a rpm package. Both these formats supply all the files that make up the driver update together in a single file.

Often, you do not need the new hardware during the installation process. For example, if you use a DVD to install to a local hard drive, the installation will succeed even if drivers for your network card are not available. In situations like this, complete the installation and add support for the piece of hardware afterward — refer to Section 23.1, “Driver update rpm packages” for details of using a driver update rpm package to add this support.

In other situations, you might want to add drivers for a device during the installation process to support a particular configuration. For example, you might want to install drivers for a network device or a storage adapter card to give the installer access to the storage devices that your system uses. You can use a driver update image file to add this support during installation in one of three ways:

place the image file in a location accessible to the installer:
1. on a local IDE hard drive
2. a USB storage device such as a USB flash drive
3. on a FTP, HTTP, or NFS server on your local network (or take note of a location on the Internet where someone else has placed the image file)
create a driver update disk by unpacking the image file onto:
1. a CD (if your computer has an IDE optical drive)
2. a DVD (if your computer has an IDE optical drive)
3. a floppy disk
4. a USB storage device such as a USB flash drive
create an initial ramdisk update from the image file and store it on a PXE server. This is an advanced procedure that you should consider only if you cannot perform a driver update with any other method.

If Red Hat, your hardware vendor, or a trusted third party told you that you will require a driver update during the installation process, choose a method to supply the update from the methods described in this chapter and test it before beginning the installation. Conversely, do not perform a driver update during installation unless you are certain that your system requires it. Although installing an unnecessary driver update will not cause harm, the presence of a driver on a system for which it was not intended can complicate support.

7.1. Limitations of driver updates during installation

Unfortunately, some situations persist in which you cannot use a driver update to provide drivers during installation:

Devices already in use: You cannot use a driver update to replace drivers that the installation program has already loaded. Instead, you must complete the installation with the drivers that the installation program loaded and update to the new drivers after installation, or, if you need the new drivers for the installation process, consider performing an initial RAM disk driver update — refer to Section 7.2.3, “Preparing an initial RAM disk update”.
Devices with an equivalent device available: Because all devices of the same type are initialized together, you cannot update drivers for a device if the installation program has loaded drivers for a similar device. For example, consider a system that has two different network adapters, one of which has a driver update available. The installation program will initialize both adapters at the same time, and therefore, you will not be able to use this driver update. Again, complete the installation with the drivers loaded by the installation program and update to the new drivers after installation, or use an initial RAM disk driver update.

7.2. Preparing for a driver update during installation

If a driver update is necessary and available for your hardware, Red Hat or a trusted third party such as the hardware vendor will provide it in the form of an image file in ISO format. Some methods of performing a driver update require you to make the image file available to the installation program, others require you to use the image file to make a driver update disk, and one requires you to prepare an initial RAM disk update:

Methods that use the image file itself

local hard drive (IDE only)
USB storage device (for example, USB flash drive)
network (HTTP, FTP, NFS)

Methods that use a driver update disk produced from an image file

floppy disk
CD (IDE only)
DVD (IDE only)
USB storage device (for example, USB flash drive)

Methods that use an initial RAM disk update

Choose a method to provide the driver update, and refer to Section 7.2.1, “Preparing to use a driver update image file”, Section 7.2.2, “Preparing a driver update disk” or Section 7.2.3, “Preparing an initial RAM disk update”. Note that you can use a USB storage device either to provide an image file, or as a driver update disk.

Important

During installation, you cannot provide driver updates on media that is read by a device with a SATA or SCSI connection. For example, if the only optical drive on your system is a DVD drive with a SATA connection, you cannot provide a driver update on CD or DVD.

7.2.1. Preparing to use a driver update image file

7.2.1.1. Preparing to use an image file on local storage

To make the ISO image file available on local storage, such as a USB flash drive, USB hard drive, or local IDE hard drive, simply copy the file onto the storage device. You can rename the file if you find it helpful to do so, but you must not change the filename extension, which must remain .iso. In the following example, the file is named dd.iso:

Figure 7.1. Content of a USB flash drive holding a driver update image file

Note that if you use this method, the storage device will contain only a single file. This differs from driver update disks on formats such as CD and DVD, which contain many files. The ISO image file contains all of the files that would normally be on a driver update disk.

Refer to Section 7.3.2, “Let the installer prompt you for a driver update” and Section 7.3.3, “Use a boot option to specify a driver update disk” to learn how to use the driver update disk during installation.

If you change the file system label of the device to OEMDRV, the installation program will automatically examine it for driver updates and load any that it detects. This behavior is controlled by the dlabel=on boot option, which is enabled by default. Refer to Section 7.3.1, “Let the installer automatically find a driver update disk”.

7.2.1.2. Preparing to use an image file available through a network

To make the ISO image file available on a local network, place it in a publicly accessible folder on a HTTP, FTP, or NFS server. If you plan to use an image file that is already publicly available through the Internet, no special preparation is necessary. In either case, take note of the URL and verify that you can access the file from another machine on your network before commencing installation.

Refer to Section 7.3.2, “Let the installer prompt you for a driver update” and Section 7.3.4, “Use a boot option to specify a driver update image file on a network” to learn how to specify this network location during installation.

7.2.2. Preparing a driver update disk

You can use a variety of media to create a driver update disk, including CD, DVD, floppy disk, and USB storage devices such as USB flash drives

7.2.2.1. Creating a driver update disk on CD or DVD

Important

CD/DVD Creator is part of the GNOME desktop. If you use a different Linux desktop, or a different operating system altogether, you will need to use another piece of software to create the CD or DVD. The steps will be generally similar.

Make sure that the software that you choose can create CDs or DVDs from image files. While this is true of most CD and DVD burning software, exceptions exist. Look for a button or menu entry labeled burn from image or similar. If your software lacks this feature, or you do not select it, the resulting disk will hold only the image file itself, instead of the contents of the image file.

Use the desktop file manager to locate the driver update ISO image file supplied to you by Red Hat or your hardware vendor.
Figure 7.2. A typical .iso file displayed in a file manager window
Right-click on this file and choose Write to disc. You will see a window similar to the following:
Figure 7.3. CD/DVD Creator's Write to Disc dialog
Click the Write button. If a blank disc is not already in the drive, CD/DVD Creator will prompt you to insert one.

After you burn a driver update disk CD or DVD, verify that the disk was created successfully by inserting it into your system and browsing to it using the file manager. You should see a list of files similar to the following:

Figure 7.4. Contents of a typical driver update disc on CD or DVD

If you see only a single file ending in .iso, then you have not created the disk correctly and should try again. Ensure that you choose an option similar to burn from image if you use a Linux desktop other than GNOME or if you use a different operating system.

7.2.2.2. Creating a driver update disk on floppy disk, or USB storage device

Important

The following procedure assumes that you are creating a driver update disk using Linux. To create a driver update disk using a different operating system, you will need to find a tool that can extract files from ISO images. You must then place the extracted files on a removable disk or USB storage device.

Warning

If you perform this procedure with a disk or USB storage device that already contains data, this data will be destroyed with no warning. Make sure that you specify the correct disk or USB storage device, and make sure that this disk or storage device does not contain any data that you want to keep.

Insert a blank, formatted floppy disk into an available drive, or connect an empty USB storage device (such as a USB flash drive) to your computer. Note the device name allocated to this disk, for example, /dev/fd0 for a floppy disk in the first floppy drive on your system.
If you do not know the device name, become root and use the command fdisk -l on the command line. You will see a list of all storage devices available on your system. Compare the output of fdisk -l when the disk inserted or the storage device is attached with the output of this command when the disk is removed or the storage device is disconnected.
At the command line, change into the directory that contains the image file.
At the command line, type:
```
dd if=image of=device
```
where image is the image file, and device is the device name. For example, to create a driver disk on floppy disk /dev/fd0 from driver update image file dd.iso, you would use:
```
dd if=dd.iso of=/dev/fd0
```

After you create a driver update disk, insert it (if you used a disk) or attach it (if you used a USB storage device) and browse to it using the file manager. If you see a list of files similar to those illustrated in Figure 7.4, “Contents of a typical driver update disc on CD or DVD”, you know that you have created the driver update disk correctly.

7.2.3. Preparing an initial RAM disk update

Important

This is an advanced procedure that you should consider only if you cannot perform a driver update with any other method.

The Red Hat Enterprise Linux installation program can load updates for itself early in the installation process from a RAM disk — an area of your computer's memory that temporarily behaves as if it were a disk. You can use this same capability to load driver updates. To perform a driver update during installation, your computer must be able to boot from a preboot execution environment (PXE) server, and you must have a PXE server available on your network. Refer to Chapter 34, PXE Network Installations for instructions on using PXE during installation.

To make the driver update available on your PXE server:

Place the driver update image file on your PXE server. Usually, you would do this by downloading it to the PXE server from a location on the Internet specified by Red Hat or your hardware vendor. Names of driver update image files end in .iso.
Copy the driver update image file into the /tmp/initrd_update directory.
Rename the driver update image file to dd.img.
At the command line, change into the /tmp/initrd_update directory, type the following command, and press Enter:
```
find . | cpio --quiet -c -o | gzip -9 >/tmp/initrd_update.img
```
Copy the file /tmp/initrd_update.img into the directory the holds the target that you want to use for installation. This directory is placed under the /tftpboot/pxelinux/ directory. For example, /tftpboot/pxelinux/r5su3/ might hold the PXE target for Red Hat Enterprise Linux 5.3 Server.
Edit the /tftpboot/pxelinux/pxelinux.cfg/default file to include an entry that includes the initial RAM disk update that you just created, in the following format:
```
label target-dd
kernel target/vmlinuz
append initrd=target/initrd.img,target/dd.img
```
Where target is the target that you want to use for installation.

Example 7.1. Preparing an initial RAM disk update from a driver update image file

In this example, driver_update.iso is a driver update image file that you downloaded from the Internet to a directory on your PXE server. The target that you want to PXE boot from is located in /tftpboot/pxelinux/r5su3

At the command line, change to the directory that holds the file and enter the following commands:

$ cp driver_update.iso /tmp/initrd_update/dd.img
$ cd /tmp/initrd_update
$ find . | cpio --quiet -c -o | gzip -9 >/tmp/initrd_update.img
$ cp /tmp/initrd_update.img /tftpboot/pxelinux/r5su3/dd.img

Edit the /tftpboot/pxelinux/pxelinux.cfg/default file and include the following entry:

label r5su3-dd
kernel r5su3/vmlinuz
append initrd=r5su3/initrd.img,r5su3/dd.img

Refer to Section 7.3.5, “Select a PXE target that includes a driver update” to learn how to use an initial RAM disk update during installation.

7.3. Performing a driver update during installation

You can perform a driver update during installation in the following ways:

let the installer automatically find a driver update disk.
let the installer prompt you for a driver update.
use a boot option to specify a driver update disk.
use a boot option to specify a driver update image file on a network.
select a PXE target that includes a driver update.

7.3.1. Let the installer automatically find a driver update disk

Attach a block device with the filesystem label OEMDRV before starting the installation process. The installer will automatically examine the device and load any driver updates that it detects and will not prompt you during the process. Refer to Section 7.2.1.1, “Preparing to use an image file on local storage” to prepare a storage device for the installer to find.

7.3.2. Let the installer prompt you for a driver update

Begin the installation normally for whatever method you have chosen. If the installer cannot load drivers for a piece of hardware that is essential for the installation process (for example, if it cannot detect any network or storage controllers), it prompts you to insert a driver update disk:
Figure 7.5. The no driver found dialog
Select Use a driver disk and refer to Section 7.4, “Specifying the location of a driver update image file or driver update disk”.

7.3.3. Use a boot option to specify a driver update disk

Important

This method only works to introduce completely new drivers, not to update existing drivers.

Type linux dd at the boot prompt at the start of the installation process and press Enter. The installer prompts you to confirm that you have a driver disk:
Figure 7.6. The driver disk prompt
Insert the driver update disk that you created on CD, DVD, floppy disk, or USB storage device and select Yes. The installer examines the storage devices that it can detect. If there is only one possible location that could hold a driver disk (for example, the installer detects the presence of a floppy disk, but no other storage devices) it will automatically load any driver updates that it finds at this location.
If the installer finds more than one location that could hold a driver update, it prompts you to specify the location of the update. Refer to to Section 7.4, “Specifying the location of a driver update image file or driver update disk” .

7.3.4. Use a boot option to specify a driver update image file on a network

Important

This method only works to introduce completely new drivers, not to update existing drivers.

Type linux dd=URL (where URL is the HTTP, FTP, or NFS address of a driver update image) at the boot prompt at the start of the installation process and press Enter. The installer will retrieve the driver update image from that address and use it during installation.

7.3.5. Select a PXE target that includes a driver update

Select network boot in your computer's BIOS or boot menu. The procedure to specify this option varies widely among different computers. Consult your hardware documentation or the hardware vendor for specifics relevant to your computer.
In the preexecution boot environment (PXE), choose the boot target that you prepared on your PXE server. For example, if you labeled this environment r5su3-dd in the /tftpboot/pxelinux/pxelinux.cfg/default file on your PXE server, type r5su3-dd at the prompt and press Enter.

Refer to Section 7.2.3, “Preparing an initial RAM disk update” and Chapter 34, PXE Network Installations for instructions on using PXE to perform an update during installation. Note that this is an advanced procedure — do not attempt it unless other methods of performing a driver update fail.

7.4. Specifying the location of a driver update image file or driver update disk

If the installer detects more than one possible device that could hold a driver update, it prompts you to select the correct device. If you are not sure which option represents the device on which the driver update is stored, try the various options in order until you find the correct one.

Figure 7.7. Selecting a driver disk source

If the device that you choose contains no suitable update media, the installer will prompt you to make another choice.

If you made a driver update disk on floppy disk, CD, DVD, or USB storage device, the installer now loads the driver update. However, if the device that you selected is a type of device that could contain more than one partition (whether the device currently has more than one partition or not), the installer might prompt you to select the partition that holds the driver update.

Figure 7.8. Selecting a driver disk partition

The installer prompts you to specify which file contains the driver update:

Figure 7.9. Selecting an ISO image

Expect to see these screens if you stored the driver update on an internal hard drive or on a USB storage device. You should not see them if the driver update is on a floppy disk, CD, or DVD.

Regardless of whether you are providing a driver update in the form of an image file or with a driver update disk, the installer now copies the appropriate update files into a temporary storage area (located in system RAM and not on disk). The installer might ask whether you would like to use additional driver updates. If you select Yes, you can load additional updates in turn. When you have no further driver updates to load, select No. If you stored the driver update on removeable media, you can now safely eject or disconnect the disk or device. The installer no longer requires the driver update, and you can re-use the media for other purposes.

Chapter 8. Additional Boot Options for Intel® and AMD Systems

This section discusses additional boot and kernel boot options available for the Red Hat Enterprise Linux installation program.

To use any of the boot options presented here, type the command you wish to invoke at the installation boot: prompt.

Boot Time Command Arguments

askmethod: this command asks you to select the installation method you would like to use when booting from the Red Hat Enterprise Linux CD-ROM.
apic: this x86 boot command works around a bug commonly encountered in the Intel 440GX chipset BIOS and should only be executed with the installation program kernel.
dd: this argument causes the installation program to prompt you to use a driver diskette.
dd=url: this argument causes the installation program to prompt you to use a driver image from a specified HTTP, FTP, or NFS network address.
display=ip:0: this command allows remote display forwarding. In this command, ip should be replaced with the IP address of the system on which you want the display to appear.
On the system you want the display to appear on, you must execute the command xhost +remotehostname, where remotehostname is the name of the host from which you are running the original display. Using the command xhost +remotehostname limits access to the remote display terminal and does not allow access from anyone or any system not specifically authorized for remote access.
driverdisk: this command performs the same function as the dd command and also prompts you to use a driver diskette during the installation of Red Hat Enterprise Linux.
linux upgradeany: this command relaxes some of the checks on your /etc/redhat-release file. If your /etc/redhat-release file has been changed from the default, your Red Hat Enterprise Linux installation may not be found when attempting an upgrade to Red Hat Enterprise Linux 5. Use this option only if your existing Red Hat Enterprise Linux installation was not detected.
mediacheck: this command gives you the option of testing the integrity of the install source (if an ISO-based method). this command works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Verifying that the ISO images are intact before you attempt an installation helps to avoid problems that are often encountered during an installation.
mem=xxxm: this command allows you to override the amount of memory the kernel detects for the machine. This may be needed for some older systems where only 16 mb is detected and for some new machines where the video card shares the video memory with the main memory. When executing this command, xxx should be replaced with the amount of memory in megabytes.
mpath: enables multipath support.
Important
If you install Red Hat Enterprise Linux 5.11 on a network storage device accessible through multiple paths, you must boot the installation process with this option. If you do not specify this option at boot time, installation will fail, or the system will fail to boot after installation completes.
nmi_watchdog=1: this command enables the built-in kernel deadlock detector. This command can be used to debug hard kernel lockups. by executing periodic NMI (Non Maskable Interrupt) interrupts, the kernel can monitor whether any CPU has locked up and print out debugging messages as needed.
noapic: this x86 boot command tells the kernel not to use the APIC chip. It may be helpful for some motherboards with a bad APIC (such as the Abit BP6) or with a buggy bios. systems based on the nvidia nforce3 chipset (such as the Asus SK8N) have been known to hang during IDE detection at boot time, or display other interrupt-delivery issues.
noeject: do not eject optical discs after installation. This option is useful in remote installations where it is difficult to close the tray afterwards.
nomce: this x86 boot command disables self-diagnosis checks performed on the CPU. the kernel enables self-diagnosis on the CPU by default (called machine check exception). Early Compaq Pentium systems may need this option as they do not support processor error checking correctly. A few other laptops, notably those using the Radeon IGP chipset, may also need this option.
nonet: this command disables network hardware probing.
nopass: this command disables the passing of keyboard and mouse information to stage 2 of the installation program. It can be used to test keyboard and mouse configuration screens during stage 2 of the installation program when performing a network installation.
nopcmcia: this command ignores any PCMCIA controllers in system.
noprobe: this command disables hardware detection and instead prompts the user for hardware information.
noshell: this command disables shell access on virtual console 2 during an installation.
nostorage: this command disables probing for SCSI and RAID storage hardware.
nousb: this command disables the loading of USB support during the installation. If the installation program tends to hang early in the process, this command may be helpful.
nousbstorage: this command disables the loading of the usbstorage module in the installation program's loader. It may help with device ordering on SCSI systems.
numa=off: Red Hat Enterprise Linux supports NUMA (non-uniform memory access) on the AMD64 architecture. while all cpus can access all memory even without numa support, the numa support present in the updated kernel causes memory allocations to favor the cpu on which they originate as much as possible, thereby minimizing inter-CPU memory traffic. This can provide significant performance improvements in certain applications. to revert to the original non-NUMA behavior, specify this boot option.
reboot=b: this x86, AMD64, and Intel® EM64T boot command changes the way the kernel tries to reboot the machine. If a kernel hang is experienced while the system is shutting down, this command may cause the system to reboot successfully.
rescue: this command runs rescue mode. Refer to Chapter 27, Basic System Recovery for more information about rescue mode.
resolution=: tells the installation program which video mode to run. it accepts any standard resolution, such as 640x480, 800x600, 1024x768, and so on.
serial: this command turns on serial console support.
text: this command disables the graphical installation program and forces the installation program to run in text mode.
updates: this command prompts you to insert a floppy diskette containing updates (bug fixes) for the anaconda installation program. It is not needed if you are performing a network installation and have already placed the updates image contents in rhupdates/ on the server.
updates=: this command allows you to specify a URL to retrieve updates (bug fixes) for the anaconda installation program.
vnc: this command allows you to install from a VNC server.
vncpassword=: this command sets the password used to connect to the VNC server.

Important

Other kernel boot options have no particular meaning for anaconda and do not affect the installation process. However, if you use these options to boot the installation system, anaconda will preserve them in the bootloader configuration.

Chapter 9. The GRUB Boot Loader

When a computer with Red Hat Enterprise Linux is turned on, the operating system is loaded into memory by a special program called a boot loader. A boot loader usually exists on the system's primary hard drive (or other media device) and has the sole responsibility of loading the Linux kernel with its required files or (in some cases) other operating systems into memory.

9.1. Boot Loaders and System Architecture

Each architecture capable of running Red Hat Enterprise Linux uses a different boot loader. The following table lists the boot loaders available for each architecture:

Table 9.1. Boot Loaders by Architecture
Architecture	Boot Loaders
AMD® AMD64	GRUB
IBM® eServer™ System i™	OS/400®
IBM® eServer™ System p™	YABOOT
IBM® System z®	z/IPL
IBM® System z®	z/IPL
Intel® Itanium™	ELILO
x86	GRUB

This chapter discusses commands and configuration options for the GRUB boot loader included with Red Hat Enterprise Linux for the x86 architecture.

9.2. GRUB

The GNU GRand Unified Boot loader (GRUB) is a program which enables the selection of the installed operating system or kernel to be loaded at system boot time. It also allows the user to pass arguments to the kernel.

9.2.1. GRUB and the x86 Boot Process

This section discusses the specific role GRUB plays when booting an x86 system. For a look at the overall boot process, refer to Section 33.2, “A Detailed Look at the Boot Process”.

GRUB loads itself into memory in the following stages:

The Stage 1 or primary boot loader is read into memory by the BIOS from the MBR^[4]. The primary boot loader exists on less than 512 bytes of disk space within the MBR and is capable of loading either the Stage 1.5 or Stage 2 boot loader.
The Stage 1.5 boot loader is read into memory by the Stage 1 boot loader, if necessary. Some hardware requires an intermediate step to get to the Stage 2 boot loader. This is sometimes true when the /boot/ partition is above the 1024 cylinder head of the hard drive or when using LBA mode. The Stage 1.5 boot loader is found either on the /boot/ partition or on a small part of the MBR and the /boot/ partition.
The Stage 2 or secondary boot loader is read into memory. The secondary boot loader displays the GRUB menu and command environment. This interface allows the user to select which kernel or operating system to boot, pass arguments to the kernel, or look at system parameters.
The secondary boot loader reads the operating system or kernel as well as the contents of /boot/sysroot/ into memory. Once GRUB determines which operating system or kernel to start, it loads it into memory and transfers control of the machine to that operating system.

The method used to boot Red Hat Enterprise Linux is called direct loading because the boot loader loads the operating system directly. There is no intermediary between the boot loader and the kernel.

The boot process used by other operating systems may differ. For example, the Microsoft® Windows® operating system, as well as other operating systems, are loaded using chain loading. Under this method, the MBR points to the first sector of the partition holding the operating system, where it finds the files necessary to actually boot that operating system.

GRUB supports both direct and chain loading boot methods, allowing it to boot almost any operating system.

Warning

During installation, Microsoft's DOS and Windows installation programs completely overwrite the MBR, destroying any existing boot loaders. If creating a dual-boot system, it is best to install the Microsoft operating system first.

9.2.2. Features of GRUB

GRUB contains several features that make it preferable to other boot loaders available for the x86 architecture. Below is a partial list of some of the more important features:

GRUB provides a true command-based, pre-OS environment on x86 machines. This feature affords the user maximum flexibility in loading operating systems with specified options or gathering information about the system. For years, many non-x86 architectures have employed pre-OS environments that allow system booting from a command line.
GRUB supports Logical Block Addressing (LBA) mode. LBA places the addressing conversion used to find files in the hard drive's firmware, and is used on many IDE and all SCSI hard devices. Before LBA, boot loaders could encounter the 1024-cylinder BIOS limitation, where the BIOS could not find a file after the 1024 cylinder head of the disk. LBA support allows GRUB to boot operating systems from partitions beyond the 1024-cylinder limit, so long as the system BIOS supports LBA mode. Most modern BIOS revisions support LBA mode.
GRUB can read ext2 partitions. This functionality allows GRUB to access its configuration file, /boot/grub/grub.conf, every time the system boots, eliminating the need for the user to write a new version of the first stage boot loader to the MBR when configuration changes are made. The only time a user needs to reinstall GRUB on the MBR is if the physical location of the /boot/ partition is moved on the disk. For details on installing GRUB to the MBR, refer to Section 9.3, “Installing GRUB”.

9.3. Installing GRUB

If GRUB was not installed during the installation process, it can be installed afterward. Once installed, it automatically becomes the default boot loader.

Before installing GRUB, make sure to use the latest GRUB package available or use the GRUB package from the installation CD-ROMs. For instructions on installing packages, see the chapter titled Package Management with RPM in the Red Hat Enterprise Linux Deployment Guide.

Once the GRUB package is installed, open a root shell prompt and run the command /sbin/grub-install <location>, where <location> is the location that the GRUB Stage 1 boot loader should be installed. For example, the following command installs GRUB to the MBR of the master IDE device on the primary IDE bus:

/sbin/grub-install /dev/hda

The next time the system boots, the GRUB graphical boot loader menu appears before the kernel loads into memory.

Important

GRUB cannot construct a software RAID. Therefore, the /boot directory must reside on a single, specific disk partition. The /boot directory cannot be striped across multiple disks, as in a level 0 RAID. To use a level 0 RAID on your system, place /boot on a separate partition outside the RAID.

Similarly, because the /boot directory must reside on a single, specific disk partition, GRUB cannot boot the system if the disk holding that partition fails or is removed from the system. This is true even if the disk is mirrored in a level 1 RAID. The following Red Hat Knowledgebase article describes how to make the system bootable from another disk in the mirrored set: http://kbase.redhat.com/faq/docs/DOC-7095

Note that these issues apply only to RAID that is implemented in software, where the individual disks that make up the array are still visible as individual disks on the system. These issues do not apply to hardware RAID where multiple disks are represented as a single device.

9.4. GRUB Terminology

One of the most important things to understand before using GRUB is how the program refers to devices, such as hard drives and partitions. This information is particularly important when configuring GRUB to boot multiple operating systems.

9.4.1. Device Names

When referring to a specific device with GRUB, do so using the following format (note that the parentheses and comma are very important syntactically):

(<type-of-device><bios-device-number>,<partition-number>)

The <type-of-device> specifies the type of device from which GRUB boots. The two most common options are hd for a hard disk or fd for a 3.5 diskette. A lesser used device type is also available called nd for a network disk. Instructions on configuring GRUB to boot over the network are available online at http://www.gnu.org/software/grub/manual/.

The <bios-device-number> is the BIOS device number. The primary IDE hard drive is numbered 0 and a secondary IDE hard drive is numbered 1. This syntax is roughly equivalent to that used for devices by the kernel. For example, the a in hda for the kernel is analogous to the 0 in hd0 for GRUB, the b in hdb is analogous to the 1 in hd1, and so on.

The <partition-number> specifies the number of a partition on a device. Like the <bios-device-number>, most types of partitions are numbered starting at 0. However, BSD partitions are specified using letters, with a corresponding to 0, b corresponding to 1, and so on.

Note

The numbering system for devices under GRUB always begins with 0, not 1. Failing to make this distinction is one of the most common mistakes made by new users.

To give an example, if a system has more than one hard drive, GRUB refers to the first hard drive as (hd0) and the second as (hd1). Likewise, GRUB refers to the first partition on the first drive as (hd0,0) and the third partition on the second hard drive as (hd1,2).

In general the following rules apply when naming devices and partitions under GRUB:

It does not matter if system hard drives are IDE or SCSI, all hard drives begin with the letters hd. The letters fd are used to specify 3.5 diskettes.
To specify an entire device without respect to partitions, leave off the comma and the partition number. This is important when telling GRUB to configure the MBR for a particular disk. For example, (hd0) specifies the MBR on the first device and (hd3) specifies the MBR on the fourth device.
If a system has multiple drive devices, it is very important to know how the drive boot order is set in the BIOS. This is a simple task if a system has only IDE or SCSI drives, but if there is a mix of devices, it becomes critical that the type of drive with the boot partition be accessed first.

9.4.2. File Names and Blocklists

When typing commands to GRUB that reference a file, such as a menu list, it is necessary to specify an absolute file path immediately after the device and partition numbers.

The following illustrates the structure of such a command:

(<device-type><device-number>,<partition-number>)</path/to/file>

In this example, replace <device-type> with hd, fd, or nd. Replace <device-number> with the integer for the device. Replace </path/to/file> with an absolute path relative to the top-level of the device.

It is also possible to specify files to GRUB that do not actually appear in the file system, such as a chain loader that appears in the first few blocks of a partition. To load such files, provide a blocklist that specifies block by block where the file is located in the partition. Since a file is often comprised of several different sets of blocks, blocklists use a special syntax. Each block containing the file is specified by an offset number of blocks, followed by the number of blocks from that offset point. Block offsets are listed sequentially in a comma-delimited list.

The following is a sample blocklist:

0+50,100+25,200+1

This sample blocklist specifies a file that starts at the first block on the partition and uses blocks 0 through 49, 100 through 124, and 200.

Knowing how to write blocklists is useful when using GRUB to load operating systems which require chain loading. It is possible to leave off the offset number of blocks if starting at block 0. As an example, the chain loading file in the first partition of the first hard drive would have the following name:

(hd0,0)+1

The following shows the chainloader command with a similar blocklist designation at the GRUB command line after setting the correct device and partition as root:

chainloader +1

9.4.3. The Root File System and GRUB

The use of the term root file system has a different meaning in regard to GRUB. It is important to remember that GRUB's root file system has nothing to do with the Linux root file system.

The GRUB root file system is the top level of the specified device. For example, the image file (hd0,0)/grub/splash.xpm.gz is located within the /grub/ directory at the top-level (or root) of the (hd0,0) partition (which is actually the /boot/ partition for the system).

Next, the kernel command is executed with the location of the kernel file as an option. Once the Linux kernel boots, it sets up the root file system that Linux users are familiar with. The original GRUB root file system and its mounts are forgotten; they only existed to boot the kernel file.

Refer to the root and kernel commands in Section 9.6, “GRUB Commands” for more information.

9.5. GRUB Interfaces

GRUB features three interfaces which provide different levels of functionality. Each of these interfaces allows users to boot the Linux kernel or another operating system.

The interfaces are as follows:

Note

The following GRUB interfaces can only be accessed by pressing any key within the three seconds of the GRUB menu bypass screen.

Menu Interface: This is the default interface shown when GRUB is configured by the installation program. A menu of operating systems or preconfigured kernels are displayed as a list, ordered by name. Use the arrow keys to select an operating system or kernel version and press the Enter key to boot it. If you do nothing on this screen, then after the time out period expires GRUB will load the default option.
Press the e key to enter the entry editor interface or the c key to load a command line interface.
Refer to Section 9.7, “GRUB Menu Configuration File” for more information on configuring this interface.
Menu Entry Editor Interface: To access the menu entry editor, press the e key from the boot loader menu. The GRUB commands for that entry are displayed here, and users may alter these command lines before booting the operating system by adding a command line (o inserts a new line after the current line and O inserts a new line before it), editing one (e), or deleting one (d).
After all changes are made, the b key executes the commands and boots the operating system. The Esc key discards any changes and reloads the standard menu interface. The c key loads the command line interface.
Note
For information about changing runlevels using the GRUB menu entry editor, refer to Section 9.8, “Changing Runlevels at Boot Time”.
Command Line Interface: The command line interface is the most basic GRUB interface, but it is also the one that grants the most control. The command line makes it possible to type any relevant GRUB commands followed by the Enter key to execute them. This interface features some advanced shell-like features, including Tab key completion based on context, and Ctrl key combinations when typing commands, such as Ctrl+a to move to the beginning of a line and Ctrl+e to move to the end of a line. In addition, the arrow, Home, End, and Delete keys work as they do in the bash shell.
Refer to Section 9.6, “GRUB Commands” for a list of common commands.

9.5.1. Interfaces Load Order

When GRUB loads its second stage boot loader, it first searches for its configuration file. Once found, the menu interface bypass screen is displayed. If a key is pressed within three seconds, GRUB builds a menu list and displays the menu interface. If no key is pressed, the default kernel entry in the GRUB menu is used.

If the configuration file cannot be found, or if the configuration file is unreadable, GRUB loads the command line interface, allowing the user to type commands to complete the boot process.

If the configuration file is not valid, GRUB prints out the error and asks for input. This helps the user see precisely where the problem occurred. Pressing any key reloads the menu interface, where it is then possible to edit the menu option and correct the problem based on the error reported by GRUB. If the correction fails, GRUB reports an error and reloads the menu interface.

9.6. GRUB Commands

GRUB allows a number of useful commands in its command line interface. Some of the commands accept options after their name; these options should be separated from the command and other options on that line by space characters.

The following is a list of useful commands:

boot — Boots the operating system or chain loader that was last loaded.
chainloader </path/to/file> — Loads the specified file as a chain loader. If the file is located on the first sector of the specified partition, use the blocklist notation, +1, instead of the file name.
The following is an example chainloader command:
```
chainloader +1
```
displaymem — Displays the current use of memory, based on information from the BIOS. This is useful to determine how much RAM a system has prior to booting it.
initrd </path/to/initrd> — Enables users to specify an initial RAM disk to use when booting. An initrd is necessary when the kernel needs certain modules in order to boot properly, such as when the root partition is formatted with the ext3 file system.
The following is an example initrd command:
```
initrd /initrd-2.6.8-1.523.img
```
install <stage-1> <install-disk> <stage-2> p config-file — Installs GRUB to the system MBR.
- <stage-1> — Signifies a device, partition, and file where the first boot loader image can be found, such as (hd0,0)/grub/stage1.
- <install-disk> — Specifies the disk where the stage 1 boot loader should be installed, such as (hd0).
- <stage-2> — Passes the stage 2 boot loader location to the stage 1 boot loader, such as (hd0,0)/grub/stage2.
- p <config-file> — This option tells the install command to look for the menu configuration file specified by <config-file>, such as (hd0,0)/grub/grub.conf.
Warning
The install command overwrites any information already located on the MBR.
kernel </path/to/kernel> <option-1> <option-N> ... — Specifies the kernel file to load when booting the operating system. Replace </path/to/kernel> with an absolute path from the partition specified by the root command. Replace <option-1> with options for the Linux kernel, such as root=/dev/VolGroup00/LogVol00 to specify the device on which the root partition for the system is located. Multiple options can be passed to the kernel in a space separated list.
The following is an example kernel command:
```
kernel /vmlinuz-2.6.8-1.523 ro root=/dev/VolGroup00/LogVol00
```
The option in the previous example specifies that the root file system for Linux is located on the hda5 partition.
root (<device-type><device-number>,<partition>) — Configures the root partition for GRUB, such as (hd0,0), and mounts the partition.
The following is an example root command:
```
root (hd0,0)
```
rootnoverify (<device-type><device-number>,<partition>) — Configures the root partition for GRUB, just like the root command, but does not mount the partition.

Other commands are also available; type help --all for a full list of commands. For a description of all GRUB commands, refer to the documentation available online at http://www.gnu.org/software/grub/manual/.

9.7. GRUB Menu Configuration File

The configuration file (/boot/grub/grub.conf), which is used to create the list of operating systems to boot in GRUB's menu interface, essentially allows the user to select a pre-set group of commands to execute. The commands given in Section 9.6, “GRUB Commands” can be used, as well as some special commands that are only available in the configuration file.

9.7.1. Configuration File Structure

The GRUB menu interface configuration file is /boot/grub/grub.conf. The commands to set the global preferences for the menu interface are placed at the top of the file, followed by stanzas for each operating kernel or operating system listed in the menu.

The following is a very basic GRUB menu configuration file designed to boot either Red Hat Enterprise Linux or Microsoft Windows 2000:

default=0 
timeout=10 
splashimage=(hd0,0)/grub/splash.xpm.gz 
hiddenmenu 
title Red Hat Enterprise Linux Server (2.6.18-2.el5PAE)         
root (hd0,0)         
kernel /boot/vmlinuz-2.6.18-2.el5PAE ro root=LABEL=/1 rhgb quiet       
initrd /boot/initrd-2.6.18-2.el5PAE.img

# section to load Windows 
title Windows         
rootnoverify (hd0,0)         
chainloader +1

This file configures GRUB to build a menu with Red Hat Enterprise Linux as the default operating system and sets it to autoboot after 10 seconds. Two sections are given, one for each operating system entry, with commands specific to the system disk partition table.

Note

Note that the default is specified as an integer. This refers to the first title line in the GRUB configuration file. For the Windows section to be set as the default in the previous example, change the default=0 to default=1.

Configuring a GRUB menu configuration file to boot multiple operating systems is beyond the scope of this chapter. Consult Section 9.9, “Additional Resources” for a list of additional resources.

9.7.2. Configuration File Directives

The following are directives commonly used in the GRUB menu configuration file:

chainloader </path/to/file> — Loads the specified file as a chain loader. Replace </path/to/file> with the absolute path to the chain loader. If the file is located on the first sector of the specified partition, use the blocklist notation, +1.
color <normal-color> <selected-color> — Allows specific colors to be used in the menu, where two colors are configured as the foreground and background. Use simple color names such as red/black. For example:
```
color red/black green/blue
```
default=<integer> — Replace <integer> with the default entry title number to be loaded if the menu interface times out.
fallback=<integer> — Replace <integer> with the entry title number to try if the first attempt fails.
hiddenmenu — Prevents the GRUB menu interface from being displayed, loading the default entry when the timeout period expires. The user can see the standard GRUB menu by pressing the Esc key.
initrd </path/to/initrd> — Enables users to specify an initial RAM disk to use when booting. Replace </path/to/initrd> with the absolute path to the initial RAM disk.
kernel </path/to/kernel> <option-1> <option-N> — Specifies the kernel file to load when booting the operating system. Replace </path/to/kernel> with an absolute path from the partition specified by the root directive. Multiple options can be passed to the kernel when it is loaded.
password=<password> — Prevents a user who does not know the password from editing the entries for this menu option.
Optionally, it is possible to specify an alternate menu configuration file after the password=<password> directive. In this case, GRUB restarts the second stage boot loader and uses the specified alternate configuration file to build the menu. If an alternate menu configuration file is left out of the command, a user who knows the password is allowed to edit the current configuration file.
For more information about securing GRUB, see the chapter titled Workstation Security in the Red Hat Enterprise Linux Deployment Guide.
root (<device-type><device-number>,<partition>) — Configures the root partition for GRUB, such as (hd0,0), and mounts the partition.
rootnoverify (<device-type><device-number>,<partition>) — Configures the root partition for GRUB, just like the root command, but does not mount the partition.
timeout=<integer> — Specifies the interval, in seconds, that GRUB waits before loading the entry designated in the default command.
splashimage=<path-to-image> — Specifies the location of the splash screen image to be used when GRUB boots.
title group-title — Specifies a title to be used with a particular group of commands used to load a kernel or operating system.

To add human-readable comments to the menu configuration file, begin the line with the hash mark character (#).

9.8. Changing Runlevels at Boot Time

Under Red Hat Enterprise Linux, it is possible to change the default runlevel at boot time.

To change the runlevel of a single boot session, use the following instructions:

When the GRUB menu bypass screen appears at boot time, press any key to enter the GRUB menu (within the first three seconds).
Press the a key to append to the kernel command.
Add <space><runlevel> at the end of the boot options line to boot to the desired runlevel. For example, the following entry would initiate a boot process into runlevel 3:
```
grub append> ro root=/dev/VolGroup00/LogVol00 rhgb quiet 3
```

9.9. Additional Resources

This chapter is only intended as an introduction to GRUB. Consult the following resources to discover more about how GRUB works.

9.9.1. Installed Documentation

/usr/share/doc/grub-<version-number>/ — This directory contains good information about using and configuring GRUB, where <version-number> corresponds to the version of the GRUB package installed.
info grub — The GRUB info page contains a tutorial, a user reference manual, a programmer reference manual, and a FAQ document about GRUB and its usage.

9.9.2. Useful Websites

http://www.gnu.org/software/grub/ — The home page of the GNU GRUB project. This site contains information concerning the state of GRUB development and an FAQ.
http://kbase.redhat.com/faq/FAQ_43_4053.shtm — Details booting operating systems other than Linux.
http://www.linuxgazette.com/issue64/kohli.html — An introductory article discussing the configuration of GRUB on a system from scratch, including an overview of GRUB command line options.

^[4] For more on the system BIOS and the MBR, refer to Section 33.2.1, “The BIOS”.

Chapter 10. Additional Resources about Itanium and Linux

Other reference materials, related to running Red Hat Enterprise Linux on an Itanium system, are available on the Web. A few of the available resources are as follows:

/ — The Intel website on the Itanium Processor
http://developer.intel.com/technology/efi/index.htm?iid=sr+efi — The Intel website for the Extensible Firmware Interface (EFI)
http://www.itanium.com/business/bss/products/server/itanium2/index.htm — The Intel website on the Itanium 2 processor

Part II. IBM POWER Architecture - Installation and Booting

The Red Hat Enterprise Linux Installation Guide for IBM POWER systems discusses the installation of Red Hat Enterprise Linux and some basic post-installation troubleshooting. Advanced installation options are covered in the second part of this manual.

Chapter 11. Steps to Get You Started

11.1. Upgrade or Install?

For information to help you determine whether to perform an upgrade or an installation refer to Chapter 24, Upgrading Your Current System.

11.2. Preparation for IBM eServer System p and System i

The IBM eServer System p and IBM eServer System i systems introduce many options for partitioning, virtual or native devices, and consoles. Both versions of the system use the same kernel and have many of the same options available, depending on the system configuration.

If you are using a non-partitioned System p system, you do not need any pre-installation setup. For systems using the HVSI serial console, hook up your console to the T2 serial port.

If using a partitioned system, whether IBM System p or IBM System i the steps to create the partition and start the installation are largely the same. You should create the partition at the HMC and assign some CPU and memory resources, as well as SCSI and Ethernet resources, which can be either virtual or native. The HMC create partition wizard steps you through the creation.

For more information on creating the partition, refer to IBM's Infocenter article on Configuring Linux logical partitions available online at: http://publib.boulder.ibm.com/infocenter/eserver/v1r3s/index.jsp?topic=/iphbi/iphbikickoff.htm

If you are using virtual SCSI resources, rather than native SCSI, you must configure a 'link' to the virtual SCSI serving partition, and then configure the virtual SCSI serving partition itself. You create a 'link' between the virtual SCSI client and server slots using the HMC. You can configure a virtual SCSI server on either AIX or i5/OS, depending on which model and options you have.

For more information on using virtual devices, including IBM Redbooks and other online resources see: http://publib.boulder.ibm.com/infocenter/eserver/v1r3s/index.jsp?topic=/iphbi/iphbirelated.htm

Additional information on virtualization eServer i5 can be found in the IBM Redbook SG24-6388-01, Implementing POWER Linux on IBM System i Platform. This can be accessed at: http://www.redbooks.ibm.com/redpieces/abstracts/sg246388.html?Open

Once you have your system configured, you need to Activate from the HMC or power it on. Depending on what type of install you are doing, you may need to configure SMS to correctly boot the system into the installation program.

11.3. Do You Have Enough Disk Space?

The disk space used by Red Hat Enterprise Linux must be separate from the disk space used by other OSes you may have installed on your system.

Before you start the installation process, you must

have enough unpartitioned^[5] disk space for the installation of Red Hat Enterprise Linux, or
have one or more partitions that may be deleted, thereby freeing up enough disk space to install Red Hat Enterprise Linux.

To gain a better sense of how much space you really need, refer to the recommended partitioning sizes discussed in Section 12.19.4, “Recommended Partitioning Scheme”.

11.4. Can You Install Using the CD-ROM or DVD?

11.5. Preparing for a Network Installation

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

The NFS, FTP, or HTTP server to be used for installation over the network must be a separate machine which can provide the complete contents of the installation DVD-ROM or the installation CD-ROMs.

Note

	linux mediacheck

Note

To copy the files from the installation DVD or CD-ROMs to a Linux machine which acts as an installation staging server, perform the following steps:

Create an iso image from the installation disk(s) using the following command (for DVDs):
dd if=/dev/dvd of=/location/of/disk/space/RHEL5.iso
where dvd refers to your DVD drive device.

11.5.1. Preparing for FTP and HTTP installation

Insert CD-ROM or DVD-ROM.
mount /media/cdrom
If you are installing the Server variant, run cp -a /media/cdrom/Server <target-directory>
If you are installing the Client variant, run cp -a /media/cdrom/Client <target-directory>
cp /media/cdrom/RELEASE-NOTES* <target-directory> (Installation CD 1 or DVD only)
cp /media/cdrom/images <target-directory> (Installation CD 1 or DVD only)
umount /media/cdrom

(Where <target-directory> represents the path to the directory to contain the installation tree.)

Note

Do not copy the Supplementary ISO image, or any of the layered product ISO images, as this will overwrite files necessary for Anaconda's proper operation.

These ISO images must be installed after Red Hat Enterprise Linux has been installed.

11.5.2. Preparing for an NFS install

For DVD:
mv /location/of/disk/space/RHEL5.iso /publicly/available/directory/
For CDROMs:
mv /location/of/disk/space/disk*.iso /publicly/available/directory/

Ensure that the /publicly/available/directory directory is exported via NFS via an entry in /etc/exports.

To export to a specific system:

/publicly/available/directory client.ip.address

To export to all systems use an entry such as:

/publicly/available/directory *

Be sure to test the NFS share following the directions in the Red Hat Enterprise Linux Deployment Guide.

11.6. Preparing for a Hard Drive Installation

Note

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

To prepare your system for a hard drive installation, you must set the system up in one of the following ways:

Using a set of CD-ROMs, or a DVD — Create ISO image files from each installation CD-ROM, or from the DVD. For each CD-ROM (once for the DVD), execute the following command on a Linux system:
```
dd if=/dev/cdrom of=/tmp/file-name.iso
```
Using ISO images — transfer these images to the system to be installed.
Verifying that ISO images are intact before you attempt an installation, helps to avoid problems. To verify the ISO images are intact prior to performing an installation, use an md5sum program (many md5sum programs are available for various operating systems). An md5sum program should be available on the same Linux machine as the ISO images.

^[5] Unpartitioned disk space means that available disk space on the hard drive(s) you are installing to has not been divided into sections for data. When you partition a disk, each partition behaves like a separate disk drive.

Chapter 12. Installing on IBM System i and IBM System p systems

This chapter explains how to perform a Red Hat Enterprise Linux installation from the DVD/CD-ROM, using the graphical, mouse-based installation program. The following topics are discussed:

Becoming familiar with the installation program's user interface
Starting the installation program
Selecting an installation method
Configuration steps during the installation (language, keyboard, mouse, partitioning, etc.)
Finishing the installation

12.1. The Graphical Installation Program User Interface

If you have used a graphical user interface (GUI) before, you are already familiar with this process; use your mouse to navigate the screens, click buttons, or enter text fields.

If you would like to use a graphical installation with a system that does not have that capability, such as a partitioned system, you can use VNC or display forwarding. Both the VNC and display forwarding options require an active network during the installation and the use of boot time arguments. For more information on available boot time options, refer to Chapter 15, Additional Boot Options for IBM Power Systems

Note

If you do not wish to use the GUI installation program, the text mode installation program is also available. To start the text mode installation program, use the following command at the yaboot: prompt:

linux text

Refer to Section 12.5, “The Text Mode Installation Program User Interface” for a brief overview of text mode installation instructions.

Users who must use the text mode installation program can follow the GUI installation instructions and obtain all needed information.

12.2. Booting the IBM System i or IBM System p Installation Program

To boot an IBM System i or IBM System p system from a CD-ROM, you must specify the install boot device in the System Management Services (SMS) menu.

To enter the System Management Services GUI, press the 1 key during the boot process when you hear the chime sound. This brings up a graphical interface similar to the one described in this section.

On a text console, press 1 when the self test is displaying the banner along with the tested components:

Figure 12.1. SMS console

Once in the SMS menu, select the option for Select Boot Options. In that menu, specify Select Install or Boot a Device. There, select CD/DVD, and then the bus type (in most cases SCSI). If you are uncertain, you can select to view all devices. This scans all available buses for boot devices, including network adapters and hard drives.

Finally, select the device containing the installation CD. YABOOT is loaded from this device and you are presented with a boot: prompt. Press Enter or wait for the timeout to expire for the installation to begin.

If you are booting via the network, use the images/netboot/ppc64.img file on CD #1.

12.3. A Note about Linux Virtual Consoles

This information only applies to users of non-partitioned System p systems using a video card as their console. Users of partitioned System i and System p systems should skip to Section 12.4, “Using the HMC vterm”.

A virtual console is a shell prompt in a non-graphical environment, accessed from the physical machine, not remotely. Multiple virtual consoles can be accessed simultaneously.

These virtual consoles can be helpful if you encounter a problem while installing Red Hat Enterprise Linux. Messages displayed on the installation or system consoles can help pinpoint a problem. Refer to Table 12.1, “Console, Keystrokes, and Contents” for a listing of the virtual consoles, keystrokes used to switch to them, and their contents.

Generally, there is no reason to leave the default console (virtual console #6) for graphical installations unless you are attempting to diagnose installation problems.

Table 12.1. Console, Keystrokes, and Contents
console	keystrokes	contents
1	`ctrl`+`alt`+`f1`	installation dialog
2	`ctrl`+`alt`+`f2`	shell prompt
3	`ctrl`+`alt`+`f3`	install log (messages from installation program)
4	`ctrl`+`alt`+`f4`	system-related messages
5	`ctrl`+`alt`+`f5`	other messages
6	`ctrl`+`alt`+`f6`	x graphical display

12.4. Using the HMC vterm

The HMC vterm is the console for any partitioned IBM System p or IBM System i system. This is opened by right clicking on the partition on the HMC, and then selecting Open Terminal Window. Only a single vterm can be connected to the console at one time and there is no console access for partitioned system besides the vterm. This often is referred to as a 'virtual console', but is different from the virtual consoles in Section 12.3, “A Note about Linux Virtual Consoles” .

12.5. The Text Mode Installation Program User Interface

The Red Hat Enterprise Linux text mode installation program uses a screen-based interface that includes most of the on-screen widgets commonly found on graphical user interfaces. Figure 12.2, “Installation Program Widgets as seen in Boot Loader Configuration”, and Figure 12.3, “Installation Program Widgets as seen in Disk Druid”, illustrate the screens that appear during the installation process.

Note

Figure 12.2. Installation Program Widgets as seen in Boot Loader Configuration

Figure 12.3. Installation Program Widgets as seen in Disk Druid

Here is a list of the most important widgets shown in Figure 12.2, “Installation Program Widgets as seen in Boot Loader Configuration” and Figure 12.3, “Installation Program Widgets as seen in Disk Druid”:

Window — Windows (usually referred to as dialogs in this manual) appear on your screen throughout the installation process. At times, one window may overlay another; in these cases, you can only interact with the window on top. When you are finished in that window, it disappears, allowing you to continue working in the window underneath.
Checkbox — Checkboxes allow you to select or deselect a feature. The box displays either an asterisk (selected) or a space (unselected). When the cursor is within a checkbox, press Space to select or deselect a feature.
Text Input — Text input lines are regions where you can enter information required by the installation program. When the cursor rests on a text input line, you may enter and/or edit information on that line.
Text Widget — Text widgets are regions of the screen for the display of text. At times, text widgets may also contain other widgets, such as checkboxes. If a text widget contains more information than can be displayed in the space reserved for it, a scroll bar appears; if you position the cursor within the text widget, you can then use the Up and Down arrow keys to scroll through all the information available. Your current position is shown on the scroll bar by a # character, which moves up and down the scroll bar as you scroll.
Scroll Bar — Scroll bars appear on the side or bottom of a window to control which part of a list or document is currently in the window's frame. The scroll bar makes it easy to move to any part of a file.
Button Widget — Button widgets are the primary method of interacting with the installation program. You progress through the windows of the installation program by navigating these buttons, using the Tab and Enter keys. Buttons can be selected when they are highlighted.
Cursor — Although not a widget, the cursor is used to select (and interact with) a particular widget. As the cursor is moved from widget to widget, it may cause the widget to change color, or the cursor itself may only appear positioned in or next to the widget. In Figure 12.2, “Installation Program Widgets as seen in Boot Loader Configuration”, the cursor is positioned on the OK button. Figure 12.3, “Installation Program Widgets as seen in Disk Druid”, shows the cursor on the Edit button.

12.5.1. Using the Keyboard to Navigate

Pressing F12 accepts the current values and proceeds to the next dialog; it is equivalent to pressing the OK button.

Warning

Unless a dialog box is waiting for your input, do not press any keys during the installation process (doing so may result in unpredictable behavior).

12.6. Beginning Installation

12.6.1. Installing from DVD/CD-ROM

To install Red Hat Enterprise Linux from a DVD/CD-ROM, place the DVD or CD #1 in your DVD/CD-ROM drive and boot your system from the DVD/CD-ROM.

The installation program then probes your system and attempts to identify your CD-ROM drive. It starts by looking for an IDE (also known as an ATAPI) CD-ROM drive.

12.7. Installing from a Hard Drive

Figure 12.4. Selecting Partition Dialog for Hard Drive Installation

After you have identified the disk partition, the Welcome dialog appears.

12.8. Performing a Network Installation

Figure 12.5. TCP/IP Configuration

12.9. Installing via NFS

The NFS dialog applies only if you are installing from an NFS server (if you selected NFS Image in the Installation Method dialog).

Next, enter the name of the exported directory. If you followed the setup described in Section 11.5, “Preparing for a Network Installation”, you would enter the directory /export/directory/ which contains the variant/ directory.

Figure 12.6. NFS Setup Dialog

If the NFS server is exporting the ISO images of the Red Hat Enterprise Linux CD-ROMs, enter the directory which contains the ISO images.

Next, the Welcome dialog appears.

12.10. Installing via FTP

Figure 12.7. FTP Setup Dialog

Next, the Welcome dialog appears.

Note

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

12.11. Installing via HTTP

Figure 12.8. HTTP Setup Dialog

Next, the Welcome dialog appears.

Note

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

12.12. Welcome to Red Hat Enterprise Linux

The Welcome screen does not prompt you for any input. From this screen you can access the Release Notes for Red Hat Enterprise Linux 5.11 by clicking on the Release Notes button.

Click on the Next button to continue.

12.13. Language Selection

Using your mouse, select a language to use for the installation (refer to Figure 12.9, “Language Selection”).

Figure 12.9. Language Selection

Once you select the appropriate language, click Next to continue.

12.14. Keyboard Configuration

Using your mouse, select the correct layout type (for example, U.S. English) for the keyboard you would prefer to use for the installation and as the system default (refer to Figure 12.10, “Keyboard Configuration”).

Once you have made your selection, click Next to continue.

Figure 12.10. Keyboard Configuration

Note

To change your keyboard layout type after you have completed the installation, use the Keyboard Configuration Tool.

Type the system-config-keyboard command in a shell prompt to launch the Keyboard Configuration Tool. If you are not root, it prompts you for the root password to continue.

12.15. Enter the Installation Number

Enter your Installation Number (refer to Figure 12.11, “Installation Number”). This number will determine the package selection set that is available to the installer. If you choose to skip entering the installation number you will be presented with a basic selection of packages to install later on.

Figure 12.11. Installation Number

12.16. Disk Partitioning Setup

On this screen you can choose to create the default layout or choose to manual partition using the 'Create custom layout' option of Disk Druid.

Warning

Figure 12.12. Disk Partitioning Setup

If you choose to create a custom layout using Disk Druid, refer to Section 12.19, “Partitioning Your System”.

Warning

If you receive an error after the Disk Partitioning Setup phase of the installation saying something similar to:

"The partition table on device hda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive."

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

Important

12.17. Advanced Storage Options

Figure 12.13. Advanced Storage Options

Figure 12.14. Enable network Interface

Figure 12.15. Configure ISCSI Parameters

12.18. Create Default Layout

Create default layout allows you to have some control concerning what data is removed (if any) from your system. Your options are:

Remove all partitions on selected drives and create default layout — select this option to remove all partitions on your hard drive(s) (this includes partitions created by other operating systems such as Windows VFAT or NTFS partitions).
Warning
If you select this option, all data on the selected hard drive(s) is removed by the installation program. Do not select this option if you have information that you want to keep on the hard drive(s) where you are installing Red Hat Enterprise Linux.
Remove Linux partitions on selected drives and create default layout — select this option to remove only Linux partitions (partitions created from a previous Linux installation). This does not remove other partitions you may have on your hard drive(s) (such as VFAT or FAT32 partitions).
Use free space on selected drives and create default layout — select this option to retain your current data and partitions, assuming you have enough free space available on your hard drive(s).

Figure 12.16. Create Default Layout

Warning

Note

[This text does not apply to iSeries system users.]

A /boot/ partition is also necessary for software RAID setups.

If you have chosen to automatically partition your system, you should select Review and manually edit your /boot/ partition.

Click Next once you have made your selections to proceed.

12.19. Partitioning Your System

If you chose one of the three automatic partitioning options and did not select Review, skip ahead to Section 12.20, “Network Configuration”.

Note

If you have not yet planned how to set up your partitions, refer to Chapter 26, An Introduction to Disk Partitions and Section 12.19.4, “Recommended Partitioning Scheme”. At a bare minimum, you need an appropriately-sized root (/) partition, a /boot/ partition, PPC PReP boot partition, and a swap partition equal to twice the amount of RAM you have on the system.

Figure 12.17. Partitioning with Disk Druid on IBM System p and System i systems

12.19.1. Graphical Display of Hard Drive(s)

Disk Druid offers a graphical representation of your hard drive(s).

Using your mouse, click once to highlight a particular field in the graphical display. Double-click to edit an existing partition or to create a partition out of existing free space.

Above the display, you can review the name of the drive (such as /dev/hda), its size (in MB), and its model as detected by the installation program.

12.19.2. Disk Druid's Buttons

New: Used to request a new partition. When selected, a dialog box appears containing fields (such as the mount point and size fields) that must be filled in.
Edit: Used to modify attributes of the partition currently selected in the Partitions section. Selecting Edit opens a dialog box. Some or all of the fields can be edited, depending on whether the partition information has already been written to disk.
You can also edit free space as represented in the graphical display to create a new partition within that space. Either highlight the free space and then select the Edit button, or double-click on the free space to edit it.
To make a RAID device, you must first create (or reuse existing) software RAID partitions. Once you have created two or more software RAID partitions, select Make RAID to join the software RAID partitions into a RAID device.
Delete: Used to remove the partition currently highlighted in the Current Disk Partitions section. You will be asked to confirm the deletion of any partition.
Reset: Used to restore Disk Druid to its original state. All changes made will be lost if you Reset the partitions.
RAID: Used to provide redundancy to any or all disk partitions. It should only be used if you have experience using RAID. To read more about RAID, see the Red Hat Enterprise Linux Deployment Guide.
To make a RAID device, you must first create software RAID partitions. Once you have created two or more software RAID partitions, select RAID to join the software RAID partitions into a RAID device.
LVM: Allows you to create an LVM logical volume. The role of LVM (Logical Volume Manager) is to present a simple logical view of underlying physical storage space, such as a hard drive(s). LVM manages individual physical disks — or to be more precise, the individual partitions present on them. It should only be used if you have experience using LVM. To read more about LVM, see the Red Hat Enterprise Linux Deployment Guide. Note, LVM is only available in the graphical installation program.
To create an LVM logical volume, you must first create partitions of type physical volume (LVM). Once you have created one or more physical volume (LVM) partitions, select LVM to create an LVM logical volume.

12.19.3. Partition Fields

Above the partition hierarchy are labels which present information about the partitions you are creating. The labels are defined as follows:

Device: This field displays the partition's device name.
Mount Point/RAID/Volume: A mount point is the location within the directory hierarchy at which a volume exists; the volume is "mounted" at this location. This field indicates where the partition is mounted. If a partition exists, but is not set, then you need to define its mount point. Double-click on the partition or click the Edit button.
Type: This field shows the partition's file system type (for example, ext2, ext3, or vfat).
Format: This field shows if the partition being created will be formatted.
Size (MB): This field shows the partition's size (in MB).
Start: This field shows the cylinder on your hard drive where the partition begins.
End: This field shows the cylinder on your hard drive where the partition ends.

Hide RAID device/LVM Volume Group members: Select this option if you do not want to view any RAID device or LVM Volume Group members that have been created.

12.19.4. Recommended Partitioning Scheme

Unless you have a reason for doing otherwise, we recommend that you create the following partitions:

Table 12.2. Recommended System Swap Space
Amount of RAM in the System	Recommended Amount of Swap Space
4GB of RAM or less	a minimum of 2GB of swap space
4GB to 16GB of RAM	a minimum of 4GB of swap space
16GB to 64GB of RAM	a minimum of 8GB of swap space
64GB to 256GB of RAM	a minimum of 16GB of swap space
256GB to 512GB of RAM	a minimum of 32GB of swap space

Note that you can obtain better performance by distributing swap space over multiple storage devices, particularly on systems with fast drives, controllers, and interfaces.

A PPC PReP boot partition on the first partition of the hard drive — the PPC PReP boot partition contains the YABOOT boot loader (which allows other POWER systems to boot Red Hat Enterprise Linux). Unless you plan to boot from a floppy or network source, you must have a PPC PReP boot partition to boot Red Hat Enterprise Linux.
For IBM System i and IBM System p users: The PPC PReP boot partition should be between 4-8 MB, not to exceed 10 MB.
A /boot/ partition (100 MB) — the partition mounted on /boot/ contains the operating system kernel (which allows your system to boot Red Hat Enterprise Linux), along with files used during the bootstrap process. Due to the limitations of most PC firmware, creating a small partition to hold these is a good idea. For most users, a 100 MB boot partition is sufficient.
Warning
If you have a RAID card, be aware that Red Hat Enterprise Linux 5.11 does not support setting up hardware RAID on an IPR card. You can boot the standalone diagnostics CD prior to installation to create a RAID array and then install to that RAID array.
A root partition (3.0 GB - 5.0 GB) — this is where "/" (the root directory) is located. In this setup, all files (except those stored in /boot) are on the root partition.
A 3.0 GB partition allows you to install a minimal installation, while a 5.0 GB root partition lets you perform a full installation, choosing all package groups.

Warning

However, you may have /var/spool, /var/www or other subdirectories on a separate network disk, just not the complete /var filesystem.

12.19.5. Adding Partitions

To add a new partition, select the New button. A dialog box appears (refer to Figure 12.18, “Creating a New Partition”).

Note

You must dedicate at least one partition for this installation, and optionally more. For more information, refer to Chapter 26, An Introduction to Disk Partitions.

Figure 12.18. Creating a New Partition

Mount Point: Enter the partition's mount point. For example, if this partition should be the root partition, enter /; enter /boot for the /boot partition, and so on. You can also use the pull-down menu to choose the correct mount point for your partition. For a swap partition the mount point should not be set - setting the filesystem type to swap is sufficient.
File System Type: Using the pull-down menu, select the appropriate file system type for this partition. For more information on file system types, refer to Section 12.19.5.1, “File System Types”.
Allowable Drives: This field contains a list of the hard disks installed on your system. If a hard disk's box is highlighted, then a desired partition can be created on that hard disk. If the box is not checked, then the partition will never be created on that hard disk. By using different checkbox settings, you can have Disk Druid place partitions where you need them, or let Disk Druid decide where partitions should go.
Size (MB): Enter the size (in megabytes) of the partition. Note, this field starts with 100 MB; unless changed, only a 100 MB partition will be created.
Additional Size Options: Choose whether to keep this partition at a fixed size, to allow it to "grow" (fill up the available hard drive space) to a certain point, or to allow it to grow to fill any remaining hard drive space available.
If you choose Fill all space up to (MB), you must give size constraints in the field to the right of this option. This allows you to keep a certain amount of space free on your hard drive for future use.
Force to be a primary partition: Select whether the partition you are creating should be one of the first four partitions on the hard drive. If unselected, the partition is created as a logical partition. Refer to Section 26.1.3, “Partitions within Partitions — An Overview of Extended Partitions”, for more information.
Encrypt: Choose whether to encrypt the partition so that the data stored on it cannot be accessed without a passphrase, even if the storage device is connected to another system. Refer to Chapter 29, Disk Encryption Guide for information on encryption of storage devices. If you select this option, the installer prompts you to provide a passphrase before it writes the partition to the disk.
OK: Select OK once you are satisfied with the settings and wish to create the partition.
Cancel: Select Cancel if you do not want to create the partition.

12.19.5.1. File System Types

ext3 — The ext3 file system is based on the ext2 file system and has one main advantage — journaling. Using a journaling file system reduces time spent recovering a file system after a crash as there is no need to fsck ^[6] the file system. A maximum file system size of 16TB is supported for ext3. The ext3 file system is selected by default and is highly recommended.
ext2 — An ext2 file system supports standard Unix file types (regular files, directories, symbolic links, etc). It provides the ability to assign long file names, up to 255 characters.
physical volume (LVM) — Creating one or more physical volume (LVM) partitions allows you to create an LVM logical volume. LVM can improve performance when using physical disks. For more information regarding LVM, see the Red Hat Enterprise Linux Deployment Guide.
software RAID — Creating two or more software RAID partitions allows you to create a RAID device. For more information regarding RAID, see chapter RAID (Redundant Array of Independent Disks) in the Red Hat Enterprise Linux Deployment Guide.
swap — Swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing. See the Red Hat Enterprise Linux Deployment Guide for additional information.

12.19.6. Editing Partitions

To edit a partition, select the Edit button or double-click on the existing partition.

Note

If the partition already exists on your disk, you can only change the partition's mount point. To make any other changes, you must delete the partition and recreate it.

12.20. Network Configuration

If you do not have a network device, physical LAN, or virtual LAN, this screen does not appear during your installation and you should advance to Section 12.21, “Time Zone Configuration”.

Figure 12.19. Network Configuration

The installation program automatically detects any network devices you have and displays them in the Network Devices list.

Figure 12.20. Editing a Network Device

Note

Finally, if you entered the IP and Netmask information manually, you may also enter the Gateway address and the Primary and Secondary DNS addresses.

Note

To change your network configuration after you have completed the installation, use the Network Administration Tool.

Type the system-config-network command in a shell prompt to launch the Network Administration Tool. If you are not root, it prompts you for the root password to continue.

12.21. Time Zone Configuration

Set your time zone by selecting the city closest to your computer's physical location. Click on the map to zoom in to a particular geographical region of the world.

From here there are two ways for you to select your time zone:

Using your mouse, click on the interactive map to select a specific city (represented by a yellow dot). A red X appears indicating your selection.
You can also scroll through the list at the bottom of the screen to select your time zone. Using your mouse, click on a location to highlight your selection.

Select System Clock uses UTC if you know that your system is set to UTC.

Note

To change your time zone configuration after you have completed the installation, use the Time and Date Properties Tool.

Type the system-config-date command in a shell prompt to launch the Time and Date Properties Tool. If you are not root, it prompts you for the root password to continue.

To run the Time and Date Properties Tool as a text-based application, use the command timeconfig.

12.22. Set Root Password

Note

The root user (also known as the superuser) has complete access to the entire system; for this reason, logging in as the root user is best done only to perform system maintenance or administration.

Figure 12.21. Root Password

Note

To become root, type su - at the shell prompt in a terminal window and then press Enter. Then, enter the root password and press Enter.

The installation program prompts you to set a root password^[7] for your system. You cannot proceed to the next stage of the installation process without entering a root password.

Note

Do not use one of the example passwords offered in this manual. Using one of these passwords could be considered a security risk.

Note

To change your root password after you have completed the installation, use the Root Password Tool.

Type the system-config-rootpassword command in a shell prompt to launch the Root Password Tool. If you are not root, it prompts you for the root password to continue.

12.23. Package Group Selection

Now that you have made most of the choices for your installation, you are ready to confirm the default package selection or customize packages for your system.

If you choose to accept the current package list, skip ahead to Section 12.24, “Preparing to Install”.

To customize your package set further, select the Customize now option on the screen. Clicking Next takes you to the Package Group Selection screen.

You can select package groups, which group components together according to function (for example, X Window System and Editors), individual packages, or a combination of the two.

Note

Users who want support for developing or running 64-bit applications are encouraged to select the Compatibility Arch Support and Compatibility Arch Development Support packages to install architecture specific support for their systems.

To select a component, click on the checkbox beside it (refer to Figure 12.22, “Package Group Selection”).

Figure 12.22. Package Group Selection

Select each component you wish to install.

Figure 12.23. Package Group Details

12.24. Preparing to Install

12.24.1. Prepare to Install

A screen preparing you for the installation of Red Hat Enterprise Linux now appears.

For your reference, a complete log of your installation can be found in /root/install.log once you reboot your system.

Warning

To cancel this installation process, press your computer's Reset button or use the Control+Alt+Delete key combination to restart your machine.

12.25. Installing Packages

At this point there is nothing left for you to do until all the packages have been installed. How quickly this happens depends on the number of packages you have selected and your computer's speed.

12.26. Installation Complete

Congratulations! Your Red Hat Enterprise Linux installation is now complete!

The installation program prompts you to prepare your system for reboot.

IBM eServer System p and System i — Completing the Installation

Do not forget to remove any boot media.

After rebooting, you must set the open firmware boot device to the disk containing your Red Hat Enterprise Linux PReP and / partitions. To accomplish this, wait until the LED indicator or HMC SRC says E1F1, then press 1 to enter the System Management Services GUI. Click on Select Boot Options. Select Select Boot Devices. Select Configure 1st Boot Device. Select the disk containing Red Hat Enterprise Linux. Set the other devices as you wish. Then exit the SMS menus to boot your new system.

Note

Steps in the SMS menu may be different depending on the machine model.

After your computer's normal power-up sequence has completed, YABOOT's prompt appears, at which you can do any of the following things:

Press Enter — causes YABOOT's default boot entry to be booted.
Select a boot label, followed by Enter — causes YABOOT to boot the operating system corresponding to the boot label. (Press Tab for non-System i systems at the boot: prompt for a list of valid boot labels.)
Do nothing — after YABOOT's timeout period, (by default, five seconds) YABOOT automatically boots the default boot entry.

Once Red Hat Enterprise Linux has booted, one or more screens of messages should scroll by. Eventually, a login: prompt or a GUI login screen (if you installed the X Window System and chose to start X automatically) appears.

For information on registering your Red Hat Enterprise Linux subscription, refer to Chapter 25, Register Your System and Apply Subscriptions.

^[6] The fsck application is used to check the file system for metadata consistency and optionally repair one or more Linux file systems.

^[7] A root password is the administrative password for your Red Hat Enterprise Linux system. You should only log in as root when needed for system maintenance. The root account does not operate within the restrictions placed on normal user accounts, so changes made as root can have implications for your entire system.

Chapter 13. Updating drivers during installation on IBM POWER systems

place the image file in a location accessible to the installer:
1. on a local IDE hard drive
2. a USB storage device such as a USB flash drive
3. on a FTP, HTTP, or NFS server on your local network (or take note of a location on the Internet where someone else has placed the image file)
create a driver update disk by unpacking the image file onto:
1. a CD (if your computer has an IDE optical drive)
2. a DVD (if your computer has an IDE optical drive)
3. a floppy disk
4. a USB storage device such as a USB flash drive
create an initial ramdisk update from the image file and store it on a PXE server. This is an advanced procedure that you should consider only if you cannot perform a driver update with any other method.

13.1. Limitations of driver updates during installation

Unfortunately, some situations persist in which you cannot use a driver update to provide drivers during installation:

Devices already in use: You cannot use a driver update to replace drivers that the installation program has already loaded. Instead, you must complete the installation with the drivers that the installation program loaded and update to the new drivers after installation, or, if you need the new drivers for the installation process, consider performing an initial RAM disk driver update — refer to Section 13.2.3, “Preparing an initial RAM disk update”.
Devices with an equivalent device available: Because all devices of the same type are initialized together, you cannot update drivers for a device if the installation program has loaded drivers for a similar device. For example, consider a system that has two different network adapters, one of which has a driver update available. The installation program will initialize both adapters at the same time, and therefore, you will not be able to use this driver update. Again, complete the installation with the drivers loaded by the installation program and update to the new drivers after installation, or use an initial RAM disk driver update.

13.2. Preparing for a driver update during installation

Methods that use the image file itself

local hard drive (IDE only)
USB storage device (for example, USB flash drive)
network (HTTP, FTP, NFS)

Methods that use a driver update disk produced from an image file

floppy disk
CD (IDE only)
DVD (IDE only)
USB storage device (for example, USB flash drive)

Methods that use an initial RAM disk update

Choose a method to provide the driver update, and refer to Section 13.2.1, “Preparing to use a driver update image file”, Section 13.2.2, “Preparing a driver update disk” or Section 13.2.3, “Preparing an initial RAM disk update”. Note that you can use a USB storage device either to provide an image file, or as a driver update disk.

Important

13.2.1. Preparing to use a driver update image file

13.2.1.1. Preparing to use an image file on local storage

Figure 13.1. Content of a USB flash drive holding a driver update image file

Refer to Section 13.3.2, “Let the installer prompt you for a driver update” and Section 13.3.3, “Use a boot option to specify a driver update disk” to learn how to use the driver update disk during installation.

If you change the file system label of the device to OEMDRV, the installation program will automatically examine it for driver updates and load any that it detects. This behavior is controlled by the dlabel=on boot option, which is enabled by default. Refer to Section 13.3.1, “Let the installer automatically find a driver update disk”.

13.2.1.2. Preparing to use an image file available through a network

Refer to Section 13.3.2, “Let the installer prompt you for a driver update” and Section 13.3.4, “Use a boot option to specify a driver update image file on a network” to learn how to specify this network location during installation.

13.2.2. Preparing a driver update disk

You can use a variety of media to create a driver update disk, including CD, DVD, floppy disk, and USB storage devices such as USB flash drives

13.2.2.1. Creating a driver update disk on CD or DVD

Important

Use the desktop file manager to locate the driver update ISO image file supplied to you by Red Hat or your hardware vendor.
Figure 13.2. A typical .iso file displayed in a file manager window
Right-click on this file and choose Write to disc. You will see a window similar to the following:
Figure 13.3. CD/DVD Creator's Write to Disc dialog
Click the Write button. If a blank disc is not already in the drive, CD/DVD Creator will prompt you to insert one.

Figure 13.4. Contents of a typical driver update disc on CD or DVD

13.2.2.2. Creating a driver update disk on floppy disk, or USB storage device

Important

Warning

Insert a blank, formatted floppy disk into an available drive, or connect an empty USB storage device (such as a USB flash drive) to your computer. Note the device name allocated to this disk, for example, /dev/fd0 for a floppy disk in the first floppy drive on your system.
If you do not know the device name, become root and use the command fdisk -l on the command line. You will see a list of all storage devices available on your system. Compare the output of fdisk -l when the disk inserted or the storage device is attached with the output of this command when the disk is removed or the storage device is disconnected.
At the command line, change into the directory that contains the image file.
At the command line, type:
```
dd if=image of=device
```
where image is the image file, and device is the device name. For example, to create a driver disk on floppy disk /dev/fd0 from driver update image file dd.iso, you would use:
```
dd if=dd.iso of=/dev/fd0
```

After you create a driver update disk, insert it (if you used a disk) or attach it (if you used a USB storage device) and browse to it using the file manager. If you see a list of files similar to those illustrated in Figure 13.4, “Contents of a typical driver update disc on CD or DVD”, you know that you have created the driver update disk correctly.

13.2.3. Preparing an initial RAM disk update

Important

This is an advanced procedure that you should consider only if you cannot perform a driver update with any other method.

To make the driver update available on your PXE server:

Place the driver update image file on your PXE server. Usually, you would do this by downloading it to the PXE server from a location on the Internet specified by Red Hat or your hardware vendor. Names of driver update image files end in .iso.
Copy the driver update image file into the /tmp/initrd_update directory.
Rename the driver update image file to dd.img.
At the command line, change into the /tmp/initrd_update directory, type the following command, and press Enter:
```
find . | cpio --quiet -c -o | gzip -9 >/tmp/initrd_update.img
```
Copy the file /tmp/initrd_update.img into the directory the holds the target that you want to use for installation. This directory is placed under the /tftpboot/pxelinux/ directory. For example, /tftpboot/pxelinux/r5su3/ might hold the PXE target for Red Hat Enterprise Linux 5.3 Server.
Edit the /tftpboot/pxelinux/pxelinux.cfg/default file to include an entry that includes the initial RAM disk update that you just created, in the following format:
```
label target-dd
kernel target/vmlinuz
append initrd=target/initrd.img,target/dd.img
```
Where target is the target that you want to use for installation.

Example 13.1. Preparing an initial RAM disk update from a driver update image file

At the command line, change to the directory that holds the file and enter the following commands:

$ cp driver_update.iso /tmp/initrd_update/dd.img
$ cd /tmp/initrd_update
$ find . | cpio --quiet -c -o | gzip -9 >/tmp/initrd_update.img
$ cp /tmp/initrd_update.img /tftpboot/pxelinux/r5su3/dd.img

Edit the /tftpboot/pxelinux/pxelinux.cfg/default file and include the following entry:

label r5su3-dd
kernel r5su3/vmlinuz
append initrd=r5su3/initrd.img,r5su3/dd.img

Refer to Section 13.3.5, “Select a PXE target that includes a driver update” to learn how to use an initial RAM disk update during installation.

13.3. Performing a driver update during installation

You can perform a driver update during installation in the following ways:

let the installer automatically find a driver update disk.
let the installer prompt you for a driver update.
use a boot option to specify a driver update disk.
use a boot option to specify a driver update image file on a network.
select a PXE target that includes a driver update.

13.3.1. Let the installer automatically find a driver update disk

Attach a block device with the filesystem label OEMDRV before starting the installation process. The installer will automatically examine the device and load any driver updates that it detects and will not prompt you during the process. Refer to Section 13.2.1.1, “Preparing to use an image file on local storage” to prepare a storage device for the installer to find.

13.3.2. Let the installer prompt you for a driver update

Begin the installation normally for whatever method you have chosen. If the installer cannot load drivers for a piece of hardware that is essential for the installation process (for example, if it cannot detect any network or storage controllers), it prompts you to insert a driver update disk:
Figure 13.5. The no driver found dialog
Select Use a driver disk and refer to Section 13.4, “Specifying the location of a driver update image file or driver update disk”.

13.3.3. Use a boot option to specify a driver update disk

Important

This method only works to introduce completely new drivers, not to update existing drivers.

Type linux dd at the boot prompt at the start of the installation process and press Enter. The installer prompts you to confirm that you have a driver disk:
Figure 13.6. The driver disk prompt
Insert the driver update disk that you created on CD, DVD, floppy disk, or USB storage device and select Yes. The installer examines the storage devices that it can detect. If there is only one possible location that could hold a driver disk (for example, the installer detects the presence of a floppy disk, but no other storage devices) it will automatically load any driver updates that it finds at this location.
If the installer finds more than one location that could hold a driver update, it prompts you to specify the location of the update. Refer to to Section 13.4, “Specifying the location of a driver update image file or driver update disk” .

13.3.4. Use a boot option to specify a driver update image file on a network

Important

This method only works to introduce completely new drivers, not to update existing drivers.

13.3.5. Select a PXE target that includes a driver update

Select network boot in your computer's BIOS or boot menu. The procedure to specify this option varies widely among different computers. Consult your hardware documentation or the hardware vendor for specifics relevant to your computer.
In the preexecution boot environment (PXE), choose the boot target that you prepared on your PXE server. For example, if you labeled this environment r5su3-dd in the /tftpboot/pxelinux/pxelinux.cfg/default file on your PXE server, type r5su3-dd at the prompt and press Enter.

Refer to Section 13.2.3, “Preparing an initial RAM disk update” and Chapter 34, PXE Network Installations for instructions on using PXE to perform an update during installation. Note that this is an advanced procedure — do not attempt it unless other methods of performing a driver update fail.

13.4. Specifying the location of a driver update image file or driver update disk

Figure 13.7. Selecting a driver disk source

If the device that you choose contains no suitable update media, the installer will prompt you to make another choice.

Figure 13.8. Selecting a driver disk partition

The installer prompts you to specify which file contains the driver update:

Figure 13.9. Selecting an ISO image

Expect to see these screens if you stored the driver update on an internal hard drive or on a USB storage device. You should not see them if the driver update is on a floppy disk, CD, or DVD.

Chapter 14. Troubleshooting Installation on an IBM POWER System

This appendix discusses some common installation problems and their solutions.

You may also find the IBM Online Alert Section for System p and System i useful. It is located at:

http://www14.software.ibm.com/webapp/set2/sas/f/lopdiags/info/LinuxAlerts.html

Please note that the url above has been split across two lines for readability. It should be entered into a browser as one continuous line, with no linebreak.

14.1. You are Unable to Boot Red Hat Enterprise Linux

14.1.1. Is Your System Displaying Signal 11 Errors?

	linux mediacheck

For more information concerning signal 11 errors, refer to:

	http://www.bitwizard.nl/sig11/

14.2. Trouble Beginning the Installation

14.2.1. Problems with Booting into the Graphical Installation

One possible solution is to try using the resolution= boot option. Refer to Chapter 15, Additional Boot Options for IBM Power Systems for more information.

Note

14.3. Trouble During the Installation

14.3.1. `No devices found to install Red Hat Enterprise Linux` Error Message

If you receive an error message stating No devices found to install Red Hat Enterprise Linux, there is probably a SCSI controller that is not being recognized by the installation program.

Check your hardware vendor's website to determine if a driver diskette image is available that fixes your problem. For more general information on driver diskettes, refer to Chapter 13, Updating drivers during installation on IBM POWER systems.

You can also refer to the Red Hat Hardware Compatibility List, available online at:

http://hardware.redhat.com/hcl/

14.3.2. Saving Traceback Messages Without a Diskette Drive

If you receive a traceback error message during installation, you can usually save it to a diskette.

If you do not have a diskette drive available in your system, you can scp the error message to a remote system.

This information does not apply to users of headless IBM System p systems.

14.3.3. Trouble with Partition Tables

If you receive an error after the Disk Partitioning Setup (Section 12.16, “Disk Partitioning Setup”) phase of the installation saying something similar to

The partition table on device hda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive.

you may not have a partition table on that drive or the partition table on the drive may not be recognizable by the partitioning software used in the installation program.

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

14.3.4. Other Partitioning Problems for IBM™ POWER System Users

If you are using Disk Druid to create partitions, but cannot move to the next screen, you probably have not created all the partitions necessary for Disk Druid's dependencies to be satisfied.

You must have the following partitions as a bare minimum:

A / (root) partition
A <swap> partition of type swap
A PPC PReP Boot partition.
A /boot/ partition.

Note

When defining a partition's type as swap, do not assign it a mount point. Disk Druid automatically assigns the mount point for you.

14.3.5. Are You Seeing Python Errors?

Traceback (innermost last):
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/iw/progress_gui.py", line 20, in run
rc = self.todo.doInstall ()    
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/todo.py", line 1468, in doInstall 
self.fstab.savePartitions ()    
File "fstab.py", line 221, in savePartitions      
sys.exit(0)  
SystemExit: 0   
Local variables in innermost frame:  
self: <fstab.GuiFstab instance at 8446fe0>  
sys: <module 'sys' (built-in)>  
ToDo object:  (itodo  ToDo  p1  (dp2  S'method'  p3  (iimage  CdromInstallMethod  
p4  (dp5  S'progressWindow'  p6   <failed>

If you experience such an error, first try to download any available errata for anaconda. Errata can be found at:

http://www.redhat.com/support/errata/

The anaconda website may also be a useful reference and can be found online at:

http://fedoraproject.org/wiki/Anaconda

You can also search for bug reports related to this problem. To search Red Hat's bug tracking system, go to:

http://bugzilla.redhat.com/bugzilla/

Finally, if you are still facing problems related to this error, register your product and contact our support team. To register your product, go to:

http://www.redhat.com/apps/activate/

14.4. Problems After Installation

14.4.1. Unable to IPL from *NWSSTG

If you are experiencing difficulties when trying to IPL from *NWSSTG, you may not have created a PReP Boot partition set as active.

14.4.2. Booting into a Graphical Environment

Once you enter this command and press Enter, the graphical desktop environment is displayed.

Note, however, that this is just a one-time fix and does not change the log in process for future log ins.

Open a shell prompt. If you are in your user account, become root by typing the su command.

Now, type gedit /etc/inittab to edit the file with gedit. The file /etc/inittab opens. Within the first screen, a section of the file which looks like the following appears:

# Default runlevel. The runlevels used by RHS are: 
#   0 - halt (Do NOT set initdefault to this) 
#   1 - Single user mode 
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking) 
#   3 - Full multiuser mode 
#   4 - unused 
#   5 - X11 
#   6 - reboot (Do NOT set initdefault to this) 
#  id:3:initdefault:

To change from a console to a graphical login, you should change the number in the line id:3:initdefault: from a 3 to a 5.

Warning

Change only the number of the default runlevel from 3 to 5.

Your changed line should look like the following:

	 id:5:initdefault:

When you are satisfied with your change, save and exit the file using the Ctrl+Q keys. A window appears and asks if you would like to save the changes. Click Save.

The next time you log in after rebooting your system, you are presented with a graphical login prompt.

14.4.3. Problems with the X Window System (GUI)

If you are having trouble getting X (the X Window System) to start, you may not have installed it during your installation.

If you want X, you can either install the packages from the Red Hat Enterprise Linux CD-ROMs or perform an upgrade.

If you elect to upgrade, select the X Window System packages, and choose GNOME, KDE, or both, during the upgrade package selection process.

14.4.4. Problems with the X Server Crashing and Non-Root Users

If you are having trouble with the X server crashing when anyone other than root logs in, you may have a full file system (or, a lack of available hard drive space).

To verify that this is the problem you are experiencing, run the following command:

df -h

14.4.5. Problems When You Try to Log In

If you did not create a user account in the Setup Agent, log in as root and use the password you assigned to root.

If you cannot remember your root password, boot your system as linux single.

If the graphical login screen does not appear, check your hardware for compatibility issues. The Hardware Compatibility List can be found at:

	http://hardware.redhat.com/hcl/

14.4.6. Your Printer Does Not Work

If you are not sure how to set up your printer or are having trouble getting it to work properly, try using the Printer Configuration Tool.

Type the system-config-printer command at a shell prompt to launch the Printer Configuration Tool. If you are not root, it prompts you for the root password to continue.

14.4.7. Apache-based `httpd` service/Sendmail Hangs During Startup

If you are having trouble with the Apache-based httpd service or Sendmail hanging at startup, make sure the following line is in the /etc/hosts file:

127.0.0.1  localhost.localdomain  localhost

Chapter 15. Additional Boot Options for IBM Power Systems

This section discusses additional boot and kernel boot options available for the Red Hat Enterprise Linux installation program.

To use any of the boot options presented here, type the command you wish to invoke at the installation boot: prompt.

Boot Time Command Arguments

askmethod: this command asks you to select the installation method you would like to use when booting from the Red Hat Enterprise Linux CD-ROM.
dd: this argument causes the installation program to prompt you to use a driver diskette.
dd=url: this argument causes the installation program to prompt you to use a driver image from a specified HTTP, FTP, or NFS network address.
display=ip:0: this command allows remote display forwarding. In this command, ip should be replaced with the IP address of the system on which you want the display to appear.
On the system you want the display to appear on, you must execute the command xhost +remotehostname, where remotehostname is the name of the host from which you are running the original display. Using the command xhost +remotehostname limits access to the remote display terminal and does not allow access from anyone or any system not specifically authorized for remote access.
driverdisk: this command performs the same function as the dd command and also prompts you to use a driver diskette during the installation of Red Hat Enterprise Linux.
ide=nodma: this command disables DMA on all IDE devices and may be useful when having IDE-related problems.
mediacheck: this command gives you the option of testing the integrity of the install source (if an ISO-based method). this command works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Verifying that the ISO images are intact before you attempt an installation helps to avoid problems that are often encountered during an installation.
mem=xxxm: this command allows you to override the amount of memory the kernel detects for the machine. This may be needed for some older systems where only 16 mb is detected and for some new machines where the video card shares the video memory with the main memory. When executing this command, xxx should be replaced with the amount of memory in megabytes.
mpath: enables multipath support.
Important
If you install Red Hat Enterprise Linux 5.11 on a network storage device accessible through multiple paths, you must boot the installation process with this option. If you do not specify this option at boot time, installation will fail, or the system will fail to boot after installation completes.
noeject: do not eject optical discs after installation. This option is useful in remote installations where it is difficult to close the tray afterwards.
nopass: this command disables the passing of keyboard and mouse information to stage 2 of the installation program. It can be used to test keyboard and mouse configuration screens during stage 2 of the installation program when performing a network installation.
nopcmcia: this command ignores any PCMCIA controllers in system.
noprobe: this command disables hardware detection and instead prompts the user for hardware information.
noshell: this command disables shell access on virtual console 2 during an installation.
nostorage: this command disables probing for SCSI and RAID storage hardware.
nousb: this command disables the loading of USB support during the installation. If the installation program tends to hang early in the process, this command may be helpful.
nousbstorage: this command disables the loading of the usbstorage module in the installation program's loader. It may help with device ordering on SCSI systems.
rescue: this command runs rescue mode. Refer to Chapter 27, Basic System Recovery for more information about rescue mode.
resolution=: tells the installation program which video mode to run. it accepts any standard resolution, such as 640x480, 800x600, 1024x768, and so on.
serial: this command turns on serial console support.
text: this command disables the graphical installation program and forces the installation program to run in text mode.
updates: this command prompts you to insert a floppy diskette containing updates (bug fixes) for the anaconda installation program. It is not needed if you are performing a network installation and have already placed the updates image contents in rhupdates/ on the server.
vnc: this command allows you to install from a VNC server.
vncpassword=: this command sets the password used to connect to the VNC server.

Part III. IBM System z Architecture - Installation and Booting

The Red Hat Enterprise Linux Installation Guide for IBM System z Architecture systems discusses the installation of Red Hat Enterprise Linux and some basic post-installation troubleshooting. Advanced installation options are covered in the second part of this manual.

Chapter 16. Steps to Get You Started

16.1. Pre-Installation

The installation process assumes a basic familiarity with the IBM eServer System z platforms. For additional information on these platforms, refer to the IBM Redbooks available online at:

http://www.redbooks.ibm.com/

This manual assumes you are familiar with the related Redbooks and can set up logical partitions (LPARs) and virtual machines (VMs) on an IBM eServer System z system.

Note

For the most current IBM resources, visit http://www.ibm.com/eserver/zseries/.

Before you install Red Hat Enterprise Linux, you must perform the following steps:

Allocate sufficient Disk Storage Space using DASDs ^[8] or SCSI^[9] partitions to provide suitable disk space (for example, 2 GB is sufficient for server installations, while 5 GB is minimally required to install all packages).
Important
Red Hat Enterprise Linux 5 cannot use unformatted DASDs when installing with kickstart and the cmdline user interface. Refer to the clearpart documentation in Section 31.4, “Kickstart Options” for a method to ensure that DASDs are formatted during installation.
Acquire a minimum of 512 MB RAM (1 GB is strongly recommended) to designate for the Linux virtual machine.
Determine if you need swap space and if so how much. While it is possible (and recommended) to assign enough memory to z/VM and let z/VM do the necessary swapping, there may be cases where the amount of required RAM is not predictable. Such instances should be examined on a case-by-case basis.
Decide on the environment under which to run the operating system (on an LPAR or as a guest operating system on one or more virtual machines).
Finally, it is important to review sections 3.3 through 3.8, and Chapters 5 and 6 of the IBM Linux for System z Redbook, as it explains the different configurations and install scenarios available on the zSeries platform as well as how to setup an initial LPAR or Linux virtual machine (z/VM).

16.2. Additional Hardware Preparation for System z

The network configuration must be determined beforehand. Red Hat Enterprise Linux for IBM System z supports QDIO-enabled (Queued Direct I/O) and LCS (LAN channel station) devices. The CTC (channel-to-channel) and IUCV (inter-user communication vehicle) are deprecated and are not supported in Red Hat Enterprise Linux.

For the purposes of this installation, it is recommended that at least 4 GB of disk space (such as two 2 GB DASD, direct access storage device, partitions or equivalent IBM System z SCSI LUNs) be allocated for the installation process. All DASD disk allocations should be completed prior to the installation process. After the installation, more DASD or SCSI (for IBM System z only) disk partitions may be added or deleted as necessary.

16.3. Basic Overview of the Boot Method

To prepare for installation, you must have the Linux kernel (kernel.img), the ram disk (initrd.img), and if using z/VM, an optional CMS configuration file (redhat.conf) and a parameter file. Sample parameter and CMS configuration files are provided (redhat.parm and redhat.conf). You should edit the CMS configuration file and add information about your DASD. You may also want to add some information about your network configuration. Once this is started on the IBM System z, the networking is configured. You can then use ssh on another computer to log into your installation image. Now you can start an installation script to install Red Hat Enterprise Linux.

16.4. Preparing for a Network Installation

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

The NFS, FTP, or HTTP server to be used for installation over the network must be a separate machine which can provide the complete contents of the installation DVD-ROM or the installation CD-ROMs.

Note

To copy the files from the installation DVD or CD-ROMs to a Linux machine which acts as an installation staging server, perform the following steps:

Create an iso image from the installation disk(s) using the following command (for DVDs):
dd if=/dev/dvd of=/location/of/disk/space/RHEL5.iso
where dvd refers to your DVD drive device.

16.4.1. Preparing for FTP and HTTP installation

Insert CD-ROM or DVD-ROM.
mount /media/cdrom
If you are installing the Server variant, run cp -a /media/cdrom/Server <target-directory>
If you are installing the Client variant, run cp -a /media/cdrom/Client <target-directory>
cp /media/cdrom/RELEASE-NOTES* <target-directory> (Installation CD 1 or DVD only)
cp /media/cdrom/images <target-directory> (Installation CD 1 or DVD only)
umount /media/cdrom

(Where <target-directory> represents the path to the directory to contain the installation tree.)

Note

Do not copy the Supplementary ISO image, or any of the layered product ISO images, as this will overwrite files necessary for Anaconda's proper operation.

These ISO images must be installed after Red Hat Enterprise Linux has been installed.

16.4.2. Preparing for an NFS install

For DVD:
mv /location/of/disk/space/RHEL5.iso /publicly/available/directory/
For CDROMs:
mv /location/of/disk/space/disk*.iso /publicly/available/directory/

Ensure that the /publicly/available/directory directory is exported via NFS via an entry in /etc/exports.

To export to a specific system:

/publicly/available/directory client.ip.address

To export to all systems use an entry such as:

/publicly/available/directory *

Be sure to test the NFS share following the directions in the Red Hat Enterprise Linux Deployment Guide.

16.5. Preparing for a Hard Drive Installation

Note

Hard drive installations using DASD or SCSI source storage only work from native ext2 or ext3 partitions. If you have a file system based on devices other than native ext2 or ext3 (particularly a file system based on RAID or LVM partitions) you will not be able to use it as a source to perform a hard drive installation.

Ensure that you have boot media available on CD, DVD, or a USB storage device such as a flash drive.

To prepare your system for a hard drive installation, you must set the system up in one of the following ways:

Using a set of CD-ROMs, or a DVD — Create ISO image files from each installation CD-ROM, or from the DVD. For each CD-ROM (once for the DVD), execute the following command on a Linux system:
```
dd if=/dev/cdrom of=/tmp/file-name.iso
```
This command may raise an error message when the data at the end of the CD-ROM is reached which can be ignored. The ISO images created can now be used for installation, once copied to the correct DASD.
Using ISO images - transfer these to the system to be installed (or to the correct DASD or SCSI devices).
Verifying that ISO images are intact before you attempt an installation, helps to avoid problems. To verify the ISO images are intact prior to performing an installation, use an md5sum program (many md5sum programs are available for various operating systems). An md5sum program should be available on the same Linux machine as the ISO images.
Make the correct DASDs or SCSI LUNs accessible to the new VM or LPAR, and then proceed with installation.
Additionally, if a file called updates.img exists in the location from which you install, it is used for updates to anaconda, the installation program. Refer to the file install-methods.txt in the anaconda RPM package for detailed information on the various ways to install Red Hat Enterprise Linux, as well as how to apply the installation program updates.

16.6. Installing under z/VM

Log onto z/VM as the Linux guest account. You can use x3270 or c3270 (from the x3270-text package in Red Hat Enterprise Linux) to log in to z/VM from other Linux systems. Alternatively, use the 3270 terminal emulator on the IBM System z management console. If you are working from a Windows based machine, Jolly Giant (http://www.jollygiant.com) offers an SSL-enabled 3270 emulator.

If you are not in CMS mode, enter it now.

i cms

If necessary, add the device containing z/VM's TCP/IP tools to your CMS disk list. For example:

vmlink tcpmaint 592 592

If using any of the qdio/qeth based network connection types (such as OSA express or hipersockets), set the VM guest qioassist parameter off:

set qioassist off

FTP to the machine containing the boot images (kernel.img and initrd.img), log in, and execute the following commands. Use the (repl option if you are overwriting existing kernel.img, initrd.img, generic.prm, or redhat.exec files:

cd /location/of/boot/images//images/ 
locsite fix 80  
bin 
get kernel.img (repl  
get initrd.img (repl  
ascii  
get generic.prm (repl  
get redhat.exec (repl  
quit

You may now create the parameter file (for example, redhat.parm). Refer to Chapter 19, Sample Parameter Files for sample parm files. Below is an explanation of the parm file contents.

There is a limit of 32 total parameters in the parameter file. In order to accommodate limitations with parameter files, a new configuration file on a CMS DASD should be used to configure the initial network setup and the DASD specification.

A .parm file is still required for the real kernel parameters, such as root=/dev/ram0 ro ip=off ramdisk_size=40000, and single parameters which are not assigned to variables, such as vnc. Two parameters which are used in z/VM installs to point the installation program at the new CMS configuration file need to be added to the .parm file:

CMSDASD=191 CMSCONFFILE=redhat.conf

CMSDASD is the device ID of the CMS formatted DASD which contains the configuration file. CMSDASD is often the 'A' DASD (usually disk 191) of the z/VM guest account. The name of the configuration file must be set with CMSCONFFILE and needs to be all lowercase.

The syntax of the CMSCONFFILE is bash style with variable="value" pairs, one on each line.

Example redhat.parm file:

root=/dev/ram0 ro ip=off ramdisk_size=40000
CMSDASD=191 CMSCONFFILE=redhat.conf
vnc

The content of the redhat.exec file shipped by Red Hat is:

/* */                    
'cl rdr'                 
'purge rdr all'          
'spool punch * rdr'      
'PUNCH KERNEL IMG A (NOH'
'PUNCH REDHAT PARM A (NOH'
'PUNCH INITRD IMG A (NOH'
'ch rdr all keep nohold' 
'i 00c'

Example redhat.conf file:

HOSTNAME="foobar.systemz.example.com"
DASD="200-203"
NETTYPE="qeth"
IPADDR="192.168.17.115"
SUBCHANNELS="0.0.0600,0.0.0601,0.0.0602"
PORTNAME="FOOBAR"
NETWORK="192.168.17.0"
NETMASK="255.255.255.0"
BROADCAST="192.168.17.255"
SEARCHDNS="example.com:systemz.example.com"
GATEWAY="192.168.17.254"
DNS="192.168.17.1"
MTU="4096"

The following parameters are required and must be included in the parameter file:

DASD=dasd-list
Where dasd-list represents the list of DASD devices to be used by Red Hat Enterprise Linux.
Although autoprobing for DASDs is done if this parameter is omitted, it is highly recommended to include the DASD= parameter, as the device numbers (and therefore the device names) can vary when a new DASD is added to the Red Hat Enterprise Linux guest. This can result in an unusable system.
Additionally, in SAN-based environments, autoprobing in an LPAR-based install may have unintended side effects, as the number of DASD and SCSI volumes visible may be unexpectedly large and include volumes currently in use by other users. In particular, autoprobing during a kickstart install (which may have enabled autopartitioning to clear all partitions) is highly discouraged.
root=file-system
where file-system represents the device on which the root file system can be found. For installation purposes, it should be set to /dev/ram0, which is the ramdisk containing the Red Hat Enterprise Linux installation program.

The following parameters are required to set up networking:

SUBCHANNELS=

Provides required device bus IDs for the various network interfaces.

qeth: SUBCHANNELS="read_device_bus_id,write_device_bus_id, data_device_bus_id"
lcs: SUBCHANNELS="read_device_bus_id,write_device_bus_id"

For example (a sample qeth SUBCHANNEL statement):

SUBCHANNELS=0.0.0600,0.0.0601,0.0.0602

The following parameters are optional:

HOSTNAME=string
Where string is the hostname of the newly-installed Linux guest.
NETTYPE=type
Where type must be one of the following: lcs, or qeth.
Choose lcs for:
- OSA-2 Ethernet/Token Ring
- OSA-Express Fast Ethernet in non-QDIO mode
- OSA-Express High Speed Token Ring in non-QDIO mode
- Gigabit Ethernet in non-QDIO mode
Choose qeth for:
- OSA-Express Fast Ethernet
- Gigabit Ethernet (including 1000Base-T)
- High Speed Token Ring
- HiperSockets
- ATM (running Ethernet LAN emulation)
IPADDR=IP
Where IP is the IP address of the new Linux guest.
NETWORK=network
Where network is the address of your network.
NETMASK=netmask
Where netmask is the netmask.
BROADCAST=broadcast
Where broadcast is the broadcast address.
GATEWAY=gw
Where gw is the gateway-IP for your eth device.
MTU=mtu
Where mtu is the Maximum Transmission Unit (MTU) for this connection.
DNS=server1:server2::serverN
Where server1:server2::serverN is a list of DNS servers, separated by colons. For example:
DNS=10.0.0.1:10.0.0.2
SEARCHDNS=domain1:domain2::domainN
Where domain1:domain2::domainN is a list of the search domains, separated by colons. For example:
SEARCHDNS=example.com:example.org
PORTNAME=osa_portname | lcs_portnumber
This variable supports OSA devices operating in qdio mode or non-qdio mode.
When using qdio mode: osa_portname is the portname specified on the OSA device when operating in qeth mode. PORTNAME is only required for z/VM 4.3 or older without APARs VM63308 and PQ73878.
When using non-qdio mode: lcs_portnumber is used to pass the relative port number as integer in the range of 0 through 15.
FCP_n="device_number SCSI_ID WWPN SCSI_LUN FCP_LUN"
The variables can be used on systems with FCP devices to preconfigure the FCP setup and can be subsequently edited in anaconda during the installation. An example value may look similar to:
```
FCP_1="0.0.5000 0x01 0x5105074308c212e9 0x0 4010"
```
- n is an integer value (e.g. FCP_1, FCP_2, ...).
- device_number is used to specify the address of the FCP device ( 0.0.5000 for device 5000, for example).
- SCSI_ID is specified in hex-value, typically sequential values (e.g. 0x01, 0x02 ... ) are used over multiple FCP_ variables.
- WWPN is the world wide port name used for routing (often in conjunction with multipathing) and is as a 16-digit hex value (e.g. 0x5105074308c212e9).
- SCSI_LUN refers to the local SCSI logical unit value and is specified as a hex-value, typically sequential values (e.g. 0x00, 0x01, ...) are used over multiple FCP_ variables.
- FCP_LUN refers to the storage logical unit identifier and is specified as a hex-value (such as 0x4010).
Note
Each of the values used in the FCP parameters (FCP_1, FCP_2, ...) are site-specific and are normally supplied by the FCP storage administrator.

Important

Anaconda now supports both ports on CHPID for OSA Express3 cards. The installer will prompt for the port number in the initial stage of the installation. The value provided for the port also affects installed network interface startup script. When port 1 is selected, the value "portno=1" is added to OPTIONS parameter of ifcfg-eth* file.

When installing under z/VM, you can add either PORTNO=0 (to use port 0) or PORTNO=1 (to use port 1) to the CMS configuration file to avoid being prompted for the mode.

Important

When installing on a System z guest for Red Hat Enterprise Linux 5.2, you can make the mode persistent by adding either LAYER2=0 or LAYER2=1 to the CMS configuration file. Use LAYER2=0 when the OSA is in layer 3 mode, and LAYER2=1 when the OSA is in layer 2 mode.

When specifying LAYER2=1, you can also specify VSWITCH=1 when connecting to a VSWITCH, or VSWITCH=0 when connecting directly to the OSA. If a VSWITCH is not in use, specify the MAC address in the CMS configuration file using the parameter MACADDR=<MAC address>.

The following parameters for kickstart installations are optional:

RUNKS=value
Where value is defined as 1 if you want to run the installation program in noninteractive (kickstart) mode in the 3270 terminal, or 0 otherwise.
cmdline
When cmdline is specified, 3270 terminal output becomes much more readable, as the installer disables most escape terminal sequences that are applicable to unix-like consoles, but not supported on the 3270 console.
Make sure that your kickstart file contains all required parameters before you use either of the RUNKS of cmdline options.

If any of the network parameters required to make the network operate correctly are omitted from the parm file, a prompt appears during the installation boot process.

If you logged off, reconnect and log in using z/VM guest ID you configured for installation. If you are not in CMS mode, enter it now.

i cms

Use the downloaded REXX script redhat.exec that contains the commands necessary to IPL the kernel image and start the installation. After having IPLed CMS, enter redhat on the 3270 console and press the Enter key to execute this script.

The initial installation start-up script prompts you for information about your networking and DASDs unless you have specified all necessary information in the parm file.

Once all questions have been answered, you are ready to begin the core installation program, loader. To continue with the installation, refer to Chapter 17, Installing on IBM System z Systems for further instructions.

16.7. Installing in an LPAR using the Red Hat Enterprise Linux LPAR CD

The following steps must be taken when installing onto an LPAR.

Log in on the Hardware Master Console (HMC) or the Support Element Workplace (SEW) as a user with sufficient privileges to install a new OS to an LPAR. The SYSPROG user is recommended.
Select Images, then select the LPAR to which you wish to install. Use the arrows in the frame on the right side to navigate to the CPC Recovery menu.
Double-click on Load from CD-ROM or Server.
In the dialog box that follows, select Local CD-ROM then click Continue.
In the dialog that follows, keep the default selection of generic.ins then click Continue.
Skip to Section 16.9, “Installing in an LPAR (Common Steps)” to continue.

16.8. Installing in an LPAR without the Red Hat Enterprise Linux for System z CD-ROMs

Log in on the Support Element Workplace as a user with sufficient privileges to install a new OS to an LPAR.
Select Images, then select the LPAR you wish to install to.
Use the arrows in the frame on the right side to navigate to the CPC Recovery menu.
Double-click on Load from CD-ROM or Server.
In the dialog box that follows, select FTP Source, and enter the following information:
Host Computer:
Hostname or IP address of the FTP server you wish to install from (for example, ftp.redhat.com)
User ID:
Your user name on the FTP server (or anonymous)
Password:
Your password (use your email address if you are logging in as anonymous)
Account:
Leave this field empty
File location (can be left blank):
Directory on the FTP server holding Red Hat Enterprise Linux for System z (for example, /pub/redhat/linux/rawhide/s390x)
Click Continue.
In the dialog that follows, keep the default selection of redhat.ins and click Continue.
Refer to Section 16.9, “Installing in an LPAR (Common Steps)” to continue.

16.9. Installing in an LPAR (Common Steps)

Once the installation program has started (if the red field behind the LPAR icon is disappearing, the installation program has begun), select the LPAR and double-click on Operating System Messages.

The initial installation start-up script asks you questions about your networking and DASD configurations. Red Hat Enterprise Linux has changed the limit for parameter file definitions and now accepts thirty-two (32) parameters. Any information not specified in the parameter file must be specified by answering the installation program questions.

Note

If you install over a network with a Hard Drive Installation source you must perform a text mode installation.

16.10. Do You Have Enough Disk Space?

The disk space used by Red Hat Enterprise Linux must be separate from the disk space used by other OSes you may have installed on your system.

For more information about disks and partition configuration, refer to Section 17.14.4, “Recommended Partitioning Scheme”.

^[8] Direct Access Storage Devices (or DASDs) are hard disks that allow a maximum of three (3) partitions per DASD. For example, dasda has dasda[123].

^[9] Using the zFCP driver over fiber and a dedicated switch, SCSI LUNs can be presented to the linux guest as if they were locally attached SCSI drives.

Chapter 17. Installing on IBM System z Systems

This chapter explains how to perform a Red Hat Enterprise Linux installation using the graphical, mouse-based installation program. The following topics are discussed:

Becoming familiar with the installation program's user interface
Starting the installation program
Selecting an installation method
Configuration steps during the installation (language, keyboard, mouse, partitioning, etc.)
Finishing the installation

17.1. The Graphical Installation Program User Interface

If you have used a graphical user interface (GUI) before, you are already familiar with this process; use your mouse to navigate the screens, click buttons, or enter text fields.

Note

While text mode installations are not explicitly documented, those using the text mode installation program can easily follow the GUI installation instructions. One thing to note is that manipulation of LVM (Logical Volume Management) disk volumes and the configuration of zFCP devices are only possible in graphical mode. In text mode it is only possible to view and accept the default LVM setup.

17.2. The Text Mode Installation Program User Interface

The Red Hat Enterprise Linux text mode installation program uses a screen-based interface that includes most of the on-screen widgets commonly found on graphical user interfaces. Figure 17.1, “Installation Program Widgets as seen in Disk Druid” illustrates the screen that appears during the installation process.

Note

Figure 17.1. Installation Program Widgets as seen in Disk Druid

Here is a list of the most important widgets shown in Figure 17.1, “Installation Program Widgets as seen in Disk Druid”:

Text Widget — Text widgets are regions of the screen for the display of text. At times, text widgets may also contain other widgets, such as checkboxes. If a text widget contains more information than can be displayed in the space reserved for it, a scroll bar appears; if you position the cursor within the text widget, you can then use the Up and Down arrow keys to scroll through all the information available. Your current position is shown on the scroll bar by a # character, which moves up and down the scroll bar as you scroll.
Scroll Bar — Scroll bars appear on the side or bottom of a window to control which part of a list or document is currently in the window's frame. The scroll bar makes it easy to move to any part of a file.
Button Widget — Button widgets are the primary method of interacting with the installation program. You progress through the windows of the installation program by navigating these buttons, using the Tab and Enter keys. Buttons can be selected when they are highlighted.
Cursor — Although not a widget, the cursor is used to select (and interact with) a particular widget. As the cursor is moved from widget to widget, it may cause the widget to change color, or the cursor itself may only appear positioned in or next to the widget. Figure 17.1, “Installation Program Widgets as seen in Disk Druid”, shows the cursor on the Edit button.

17.2.1. Using the Keyboard to Navigate

Pressing F12 accepts the current values and proceeds to the next dialog; it is equivalent to pressing the OK button.

Warning

Unless a dialog box is waiting for your input, do not press any keys during the installation process (doing so may result in unpredictable behavior).

17.3. Running the Installation Program

After following the steps outlined in Chapter 16, Steps to Get You Started for booting an LPAR or VM system, ssh to the configured Linux install system on the IBM System z.

Although the text mode installation program is run by default for most installations, you can optionally run the graphical installation program available for both VM and LPAR installations via the NFS installation method.

Note

If you have a slow network connection or prefer a text-based installation, do not set the DISPLAY= variable in the parm file. The text-based installation is similar to the graphical installation; however, the graphical installation offers more package selection details and other options not available in text-based installs. It is strongly recommended to use the graphical installation whenever possible.

To run the graphical installation, use a workstation that has an X Window System server or VNC client installed. Use an SSH client that allows X11 forwarding or a Telnet client. SSH is strongly recommended for its security features as well as its ability to forward X and VNC sessions. Enable X11 forwarding in your SSH client prior to connecting to the Linux image (the Linux guest running on z/VM).

17.3.1. Installation using X11 Forwarding

For example, to connect to the Linux image and display the graphical installation program using OpenSSH with X11 forwarding on a Linux workstation, type the following at the workstation shell prompt:

ssh -X linuxvm.example.com

The -X option enables X11 forwarding.

The graphical installation program cannot be started if your DNS or hostnames are not set correctly, or the Linux image is not allowed to open applications on your display. You can prevent this by setting a correct DISPLAY= variable. Add the parameter DISPLAY=workstationname:0.0 in the parameter file, replacing workstationname with the hostname of the client workstation connecting to the Linux Image. Allow the Linux image to connect to the workstation using the command xhost +linuxvm on the local workstation.

If the graphical installation via NFS does not automatically begin for you, verify the DISPLAY= variable settings in the parm file. If performing a VM installation, rerun the installation to load the new parm file on the reader. Additionally, make sure when performing an X11 forwarded display that the X server is started on the workstation machine. Finally, make sure either the NFS, FTP or HTTP protocols are selected, as all 3 methods support graphical installations.

17.3.2. Installation using VNC

If you are using VNC, a message on the workstation SSH terminal prompts you to start the VNC client viewer and details the VNC display specifications. Enter the specifications from the SSH terminal into the VNC client viewer and connect to the Linux image to begin the installation.

Once you have logged into the Linux image the loader will start the installation program.

When the loader starts, several screens appear for selecting the installation method.

17.4. Installing from a Hard Drive (DASD)

After you have identified the disk partition, the Welcome dialog appears.

17.5. Installing via NFS

The NFS dialog applies only if you are installing from an NFS server (if you selected NFS Image in the Installation Method dialog).

Next, enter the name of the exported directory. If you followed the setup described in Section 16.4, “Preparing for a Network Installation”, you would enter the directory /export/directory/.

Figure 17.2. NFS Setup Dialog

If the NFS server is exporting the ISO images of the Red Hat Enterprise Linux CD-ROMs, enter the directory which contains the ISO images.

Next, the Welcome dialog appears.

17.6. Installing via FTP

Figure 17.3. FTP Setup Dialog

Next, the Welcome dialog appears.

Note

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

17.7. Installing via HTTP

Figure 17.4. HTTP Setup Dialog

Next, the Welcome dialog appears.

Note

mkdir discX

mount -o loop RHEL5-discX.iso discX

Replace X with the corresponding disc number.

17.8. Welcome to Red Hat Enterprise Linux

The Welcome screen does not prompt you for any input. From this screen you can access the Release Notes for Red Hat Enterprise Linux 5.11 by clicking on the Release Notes button.

Click on the Next button to continue.

17.9. Language Selection

Using your mouse, select a language to use for the installation (refer to Figure 17.5, “Language Selection”).

Figure 17.5. Language Selection

Once you select the appropriate language, click Next to continue.

17.10. Enter the Installation Number

Enter your Installation Number (refer to Figure 17.6, “Installation Number”). This number will determine the package selection set that is available to the installer. If you choose to skip entering the installation number you will be presented with a basic selection of packages to install later on.

Figure 17.6. Installation Number

17.11. Disk Partitioning Setup

Partitioning allows you to divide your storage drive(s) into isolated sections, where each section behaves as its own drive. Partitioning is particularly useful if you run multiple operating systems, or wish to enforce a logical or functional distinction between your storage partitions (such as a /home partition that persistently contains user information).

On this screen you can choose to create the default layout or choose to manual partition using the 'Create custom layout' option of Disk Druid.

You can configure an zFCP LUN for installation, or disable a dmraid device from this screen by clicking on the 'Advanced storage configuration' button. For more information refer to Section 17.12, “ Advanced Storage Options ”.

Warning

The default layout uses all devices made available to the installer. This includes any temporary storage devices such as vdisks or tdisks. If temporary storage devices are used with the default layout, the system might become inaccessible when these devices are redefined and the device contents are lost (for example, on logoff and relogon of z/VM guests). Review the partition layout and if temporary devices are included, go back and choose Create custom layout to exclude these devices from being used for permanent system data.

Warning

Figure 17.7. Disk Partitioning Setup

If you choose to create a custom layout using Disk Druid, refer to Section 17.14, “Partitioning Your System”.

Warning

If you receive an error after the Disk Partitioning Setup phase of the installation saying something similar to:

"The partition table on device dasda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive."

you may not have a partition table on that drive or the partition table on the drive may not be recognizable by the partitioning software used in the installation program.

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

Important

17.12. Advanced Storage Options

17.12.1. FCP Devices

FCP (Fibre Channel protocol) devices enable IBM System z to use SCSI devices rather than DASD devices. FCP (Fibre Channel protocol) devices provide a switched fabric topology that enables zSeries systems to use SCSI LUNs as disk devices in addition to traditional DASD devices.

Typically, an operating system is loaded, and the automatic probing and defining of hardware is done by the OS. However, because of the flexibility of configurations associated with FCP, IBM System z requires that any FCP (Fibre Channel protocol) device be entered manually (either in the installation program interactively, or specified as unique parameter entries in the CMS conf file) in order for the installation program to recognize the hardware. The values entered here are unique to each site in which they are setup.

Note

Interactive creation of a zFCP device is only possible in the graphical mode installer. It is not possible to interactively configure a zFCP device in a text-only install.

Each value entered should be verified as correct, as any mistakes made may cause the system not to operate properly.

For more information on these values, refer to the hardware documentation that came with your system and check with the system administrator who has setup the network for this system.

Figure 17.8. Advanced Storage Options

To configure a Fiber Channel Protocol SCSI device invoke the 'Add FCP device' dialog by selecting 'Add ZFCP LUN' and clicking on the 'Add Drive' button. Fill in the details for the 16 bit device number, 64 bit World Wide Port Number (WWPN) and 64 bit FCP LUN. Click the 'Add' button to attempt connection to the FCP device using this information.

Figure 17.9. Configure FCP Device

The newly added device should then be present and usable during the Disk Druid portion of the installation.

Figure 17.10. Configure FCP Device

Note

The installer requires that at least one ECKD DASD be defined. In the situation where a SCSI-only installation is desired a DASD= parameter should be entered into the CMS conf file with a non-existent device number. This will satisfy Anaconda's requirement for a defined ECKD DASD, while resulting in a SCSI-only environment.

17.13. Create Default Layout

Create default layout allows you to have some control concerning what data is removed (if any) from your system. Your options are:

Remove all partitions on selected drives and create default layout — select this option to remove all partitions on your hard drive(s) (this includes partitions created by other operating systems such as z/VM or z/OS).
Warning
If you select this option, all data on the selected DASD and SCSI storage drive(s) is removed by the installation program. Do not select this option if you have information that you want to keep on the storage drive(s) where you are installing Red Hat Enterprise Linux.
Remove Linux partitions on selected drives and create default layout — select this option to remove only Linux partitions (partitions created from a previous Linux installation). This does not remove other partitions you may have on your storage drive(s) (such as z/VM or z/OS partitions).
Use free space on selected drives and create default layout — select this option to retain your current data and partitions, assuming you have enough free space available on your storage drive(s).

Figure 17.11. Create Default Layout

Warning

Click Next once you have made your selections to proceed.

17.14. Partitioning Your System

Figure 17.12. Partitioning with Disk Druid

17.14.1. Graphical Display of DASD Device(s)

Disk Druid offers a graphical representation of your DASD device(s).

Using your mouse, click once to highlight a particular field in the graphical display. Double-click to edit an existing partition or to create a partition out of existing free space.

Above the display, you can review the Drive name (such as /dev/dasda), the Geom (which shows the hard disk's geometry and consists of three numbers representing the number of cylinders, heads, and sectors as reported by the hard disk), and the Model of the hard drive as detected by the installation program.

Finally, note which device is associated with /boot. The kernel files and bootloader sector will be associated with this device. For most common cases, the first DASD or SCSI LUN will be used, but for some unusual cases, this may not be the case. The device number will be used when re-ipling the post-installed system.

17.14.2. Disk Druid's Buttons

Edit: Used to modify attributes of the partition currently selected in the Partitions section. Selecting Edit opens a dialog box. Some or all of the fields can be edited, depending on whether the partition information has already been written to disk.
RAID: Used to provide redundancy to any or all disk partitions. It should only be used if you have experience using RAID. To read more about RAID, see the Red Hat Enterprise Linux Deployment Guide.
To make a RAID device, you must first create software RAID partitions. Once you have created two or more software RAID partitions, select RAID to join the software RAID partitions into a RAID device.

17.14.3. Partition Fields

Above the partition hierarchy are labels which present information about the partitions you are creating. The labels are defined as follows:

Device: This field displays the partition's device name.
Mount Point/RAID/Volume: A mount point is the location within the directory hierarchy at which a volume exists; the volume is "mounted" at this location. This field indicates where the partition is mounted. If a partition exists, but is not set, then you need to define its mount point. Double-click on the partition or click the Edit button.
Type: This field shows the partition's file system type (for example, ext2, ext3, or vfat).
Format: This field shows if the partition being created will be formatted.
Size (MB): This field shows the partition's size (in MB).
Start: This field shows the cylinder on your hard drive where the partition begins.
End: This field shows the cylinder on your hard drive where the partition ends.

Hide RAID device/LVM Volume Group members: Select this option if you do not want to view any RAID device or LVM Volume Group members that have been created.

17.14.4. Recommended Partitioning Scheme

Configuring efficient swap space for Linux on System z is a complex task. It very much depends on the specific environment and should be tuned to the actual system load.

Refer to the following resources for more information and to guide your decision:

'Chapter 7. Linux Swapping' in the IBM Redbook Linux on IBM System z: Performance Measurement and Tuning [IBM Form Number SG24-6926-01], [ISBN 0738485586], available from http://www.redbooks.ibm.com/abstracts/sg246926.html
Linux on System z performance in the IBM Systems Information Center at http://publib.boulder.ibm.com/infocenter/systems/index.jsp?topic=/liaag/lcon_Linux_on_System_z_performance.htm
Linux Performance when running under VM, available from http://www.vm.ibm.com/perf/tips/linuxper.html

17.14.5. Editing Partitions

To edit a partition, select the Edit button or double-click on the existing partition.

Note

If the partition already exists on your disk, you can only change the partition's mount point. To make any other changes, you must delete the partition and recreate it.

17.15. Network Configuration

If you do not have a network device, this screen does not appear during your installation and you should advance to Section 17.16, “Time Zone Configuration”.

Figure 17.13. Network Configuration

The installation program automatically detects any network devices you have and displays them in the Network Devices list.

Note

DHCP should not be chosen for qdio/qeth devices that are configured with OSA layer 3 support. Layer 3 does not provide MAC address or Address Resolution Protocol (ARP) abilities and so can not be used with network services that require them.

Figure 17.14. Editing a Network Device

Note

Finally, if you entered the IP and Netmask information manually, you may also enter the Gateway address and the Primary and Secondary DNS addresses.

17.16. Time Zone Configuration

Set your time zone by selecting the city closest to your computer's physical location. Click on the map to zoom in to a particular geographical region of the world.

From here there are two ways for you to select your time zone:

Using your mouse, click on the interactive map to select a specific city (represented by a yellow dot). A red X appears indicating your selection.
You can also scroll through the list at the bottom of the screen to select your time zone. Using your mouse, click on a location to highlight your selection.

Select System Clock uses UTC if you know that your system is set to UTC.

Note

To change your time zone configuration after you have completed the installation, use the Time and Date Properties Tool.

Type the system-config-date command in a shell prompt to launch the Time and Date Properties Tool. If you are not root, it prompts you for the root password to continue.

To run the Time and Date Properties Tool as a text-based application, use the command timeconfig.

17.17. Set Root Password

Note

The root user (also known as the superuser) has complete access to the entire system; for this reason, logging in as the root user is best done only to perform system maintenance or administration.

Figure 17.15. Root Password

Note

To become root, type su - at the shell prompt in a terminal window and then press Enter. Then, enter the root password and press Enter.

The installation program prompts you to set a root password^[10] for your system. You cannot proceed to the next stage of the installation process without entering a root password.

Note

Do not use one of the example passwords offered in this manual. Using one of these passwords could be considered a security risk.

Note

To change your root password after you have completed the installation, use the Root Password Tool.

Type the system-config-rootpassword command in a shell prompt to launch the Root Password Tool. If you are not root, it prompts you for the root password to continue.

17.18. Package Group Selection

Now that you have made most of the choices for your installation, you are ready to confirm the default package selection or customize packages for your system.

If you choose to accept the current package list, skip ahead to Section 17.19, “Preparing to Install”.

To customize your package set further, select the Customize now option on the screen. Clicking Next takes you to the Package Group Selection screen.

You can select package groups, which group components together according to function (for example, X Window System and Editors), individual packages, or a combination of the two.

Note

Users of IBM System z who want support for developing or running legacy 31-bit applications are encouraged to select the Compatibility Arch Support and Compatibility Arch Development Support packages to install architecture specific support for their systems.

To select a component, click on the checkbox beside it (refer to Figure 17.16, “Package Group Selection”).

Figure 17.16. Package Group Selection

Select each component you wish to install.

Figure 17.17. Package Group Details

17.19. Preparing to Install

17.19.1. Preparing to Install

A screen preparing you for the installation of Red Hat Enterprise Linux now appears.

For your reference, a complete log of your installation can be found in /root/install.log once you reboot your system.

Warning

If, for some reason, you would rather not continue with the installation process, this is your last opportunity to safely cancel the process and reboot your machine. Once you press the Next button, partitions are written and packages are installed. If you wish to abort the installation, you should close your SSH session and re-IPL the machineeboot now before any existing information on any hard drive is rewritten.

To cancel this installation process, close your SSH session and re-IPL the system using your 3270 terminal emulator.

17.20. Installing Packages

At this point there is nothing left for you to do until all the packages have been installed. How quickly this happens depends on the number of packages you have selected and your computer's speed.

17.21. Installation Complete

Congratulations! Your Red Hat Enterprise Linux installation is now complete!

The installation program prompts you to prepare your system for reboot.

Once the installation is complete, you must IPL (boot) from either the DASD or SCSI LUN where the /boot partition for Red Hat Enterprise Linux has been installed.

For example, using dasd at device 200 on the 3270 console you may issue the command #cp i 200. Often, especially in DASD only environments where automatic partitioning (clearing data from all partitions) was chosen, the first dasd (dasda) is where the /boot partition is located.

Using /boot on a SCSI LUN in a z/VM guest account, it may be necessary to provide WWPN and LUN information through which a zFCP device can ipl. As an example,

#CP SET LOADDEV PORTNAME 50050763 FCCD9689 LUN 83030000 00000000

could be used to provide zFCP routing information to a zFCP device (where 0x50050763FCCD9689 is the example WWPN, and 8303 is the SCSI LUN). Then the zFCP device information can be queried and used to start the IPL:

#cp q v fcp

After querying this information the zFCP device (4322 in this example) could be ipl-ed with a command like:

#cp ipl 4322

For LPAR-based installations, the HMC console may be used to issue a load command to the LPAR, specifying the particular DASD or SCSI LUN and zFCP WWPN where the /boot partition is located.

Note

For guest accounts using z/VM, assuming you want to disconnect from the 3270 console without halting the linux guest, use #cp disc instead of #cp logout or #cp log. This allows for the virtual system running Red Hat Enterprise Linux for IBM System z to continue even when not connected to the 3270 console.

Following IPLing the installed Red Hat Enterprise Linux OS, you may log on to the system via ssh. It is important to note that the only place you can log in as root is from the 3270 or from other devices as listed in /etc/securetty.

The first time you start your Red Hat Enterprise Linux system in a graphical environment, the Setup Agent may be manually started, which guides you through the Red Hat Enterprise Linux configuration. Using this tool, you can set your system time and date, install software, register your machine with Red Hat Network, and more. The Setup Agent lets you configure your environment at the beginning, so that you can get started using your Red Hat Enterprise Linux system quickly.

For information on registering your Red Hat Enterprise Linux subscription, refer to Chapter 25, Register Your System and Apply Subscriptions.

^[10] A root password is the administrative password for your Red Hat Enterprise Linux system. You should only log in as root when needed for system maintenance. The root account does not operate within the restrictions placed on normal user accounts, so changes made as root can have implications for your entire system.

Chapter 18. Removing Red Hat Enterprise Linux

To remove from the S/390 you can either remove the DASD allocation from the VM or you can start the installation program and re-format all of the DASD partitions. Instead of selecting OK you will select Cancel to exit the installation program.

Chapter 19. Sample Parameter Files

The IBM System z architectures use a special parameter file to set up networking before the installation program (anaconda) can be started. This section describes the contents of the parameter file.

The parameter file has a limit of 32 total parameters. To accommodate limitations of the parameter files, a new configuration file on a CMS DASD should be used to configure the initial network setup and the DASD specification. The .parm file should contain the real kernel parameters, such as root=/dev/ram0 ro ip=off ramdisk_size=40000, and single parameters which are not assigned to variables, such as vnc. Two new parameters which point the installation program at the new configuration file need to be added to the .parm file. They are CMSDASD and CMSCONF .

CMSDASD=cmsdasd_address: Where cmsdasd_address represents the list of the device ID of the CMS DASD device which contains the configuration file. This is usually the CMS user's 'A' disk. This option is applicable only for users who have a CMS formatted disk (z/VM) available.
For example: CMSDASD=191
CMSCONFFILE=configuration_file: Where configuration_file represents the name of the configuration file. This value must be specified in lower case. It is specified in a Linux style file name format. The CMS file REDHAT CONF is specified as redhat.conf. This option is applicable only for users who have a CMS formatted disk (z/VM) available.
For example: CMSCONFFILE=redhat.conf
DASD=dasd-list: Where dasd-list represents the list of DASD devices to be used by Red Hat Enterprise Linux.
Although automatic probing for DASDs is done if this parameter is omitted, it is highly recommended to include the DASD= parameter, as the device numbers (and therefore the device names) can vary when a new DASD is added to the guest. This can result in an unusable system.
For example: DASD=0.0.0100,0.0201-0.0.0204

The following parameters are required to set up networking:

SUBCHANNELS=

Provides required device bus IDs for the various network interfaces.

qeth: SUBCHANNELS="read_device_bus_id,write_device_bus_id,
      data_device_bus_id"
lcs: SUBCHANNELS="read_device_bus_id,write_device_bus_id"

Due to the length of the qeth command line, it has been broken into two lines.

Note

The CTC, and NETIUCV drivers have been deprecated and are no longer supported in Red Hat Enterprise Linux.

For example (a sample qeth SUBCHANNEL statement):

SUBCHANNELS=0.0.0600,0.0.0601,0.0.0602

The following parameters are optional:

HOSTNAME=string

Where string is the hostname of the newly-installed Linux guest.

NETTYPE=type

Where type must be one of the following: qeth or lcs.

IPADDR=IP

Where IP is the IP address of the new Linux guest.

NETWORK=network

Where network is the address of your network.

NETMASK=netmask

Where netmask is the netmask.

BROADCAST=broadcast

Where broadcast is the broadcast address.

GATEWAY=gw

Where gw is the gateway-IP for your eth device.

MTU=mtu

Where mtu is the Maximum Transmission Unit (MTU) for this connection.

DNS=server1:server2:additional_server_terms:serverN

Where server1:server2:additional_server_terms:serverN is a list of DNS servers, separated by colons. For example:

DNS=10.0.0.1:10.0.0.2

SEARCHDNS=domain1:domain2:additional_dns_terms:domainN

Where domain1:domain2:additional_dns_terms:domainN is a list of the search domains, separated by colons. For example:

SEARCHDNS=example.com:example.org

PORTNAME=osa_portname | lcs_portnumber

This variable supports OSA devices operating in qdio mode or in non-qdio mode.

When using qdio mode: osa_portname is the portname specified on the OSA device when operating in qeth mode. PORTNAME is only required for z/VM 4.3 or older without APARs VM63308 and PQ73878.

When using non-qdio mode: lcs_portnumber is used to pass the relative port number as integer in the range of 0 through 15.

PORTNO=portnumber

When installing under z/VM, you can add either PORTNO=0 (to use port 0) or PORTNO=1 (to use port 1) to the CMS configuration file to avoid being prompted for the mode.

The PORTNO= setting also works on LPAR, but you must place it directly in the parmfile rather than the CMS configuration file.

LAYER2=

Add either LAYER2=0 or LAYER2=1 to the CMS configuration file to make the mode persistent when installing on a System z guest.

Use LAYER2=0 when the OSA is in layer 3 mode, and LAYER2=1 when the OSA is in layer 2 mode.

VSWITCH=

When specifying LAYER2=1, you can also specify VSWITCH=1 when connecting to a VSWITCH, or VSWITCH=0 when connecting directly to the OSA.

MACADDR=MAC_address

When specifying LAYER2=1 and a VSWITCH is not in use, you can use this parameter to specify the MAC address in the CMS configuration file.

FCP_* (FCP_1, FCP_2, ...)

These variables can be used on systems with FCP devices to preconfigure the FCP setup (these can be changed during the installation).

Use the following samples as a guide to formatting proper parameter files.

Sample file with minimally required parameters:

root=/dev/ram0 DASD=200

Note

The installation program prompts the user for any required parameters not specified in the parameter file.

Sample file configuring a QETH networking device:

Example of redhat.parm file:

root=/dev/ram0 ro ip=off ramdisk_size=40000
CMSDASD=191 CMSCONFFILE=redhat.conf
vnc

Example of redhat.conf file (pointed to by CMSCONFFILE in redhat.parm)

DASD=200
HOSTNAME="foobar.systemz.example.com"
DASD="200-203"
NETTYPE="qeth"
IPADDR="192.168.17.115"
SUBCHANNELS="0.0.0600,0.0.0601,0.0.0602"
PORTNAME="FOOBAR"
NETWORK="192.168.17.0"
NETMASK="255.255.255.0"
BROADCAST="192.168.17.255"
SEARCHDNS="example.com:systemz.example.com"
GATEWAY="192.168.17.254"
DNS="192.168.17.1"
MTU="4096"

Chapter 20. Additional Boot Options

This section discusses additional boot and kernel boot options available for the Red Hat Enterprise Linux installation program.

To use any of the boot options presented here, type the command you wish to invoke at the installation boot: prompt.

You can also store kernel boot options for the z/IPL boot loader in the zipl.conf file, either by editing the file manually or using the zipl tool.

Important

Where kernel parameters use nested quotation marks, the required order in Red Hat Enterprise Linux is double quote marks for the outer set and single quote marks for the inner set. For example, parameters="vmhalt='LOGOFF'" is correct, while parameters='vmhalt="LOGOFF"' is not correct and may lead to unexpected behavior.

boot time command arguments

askmethod: this command asks you to select the installation method you would like to use when booting from the Red Hat Enterprise Linux CD-ROM.
dd=url: this argument causes the installation program to prompt you to use a driver image from a specified HTTP, FTP, or NFS network address.
display=ip:0: this command allows remote display forwarding. In this command, ip should be replaced with the IP address of the system on which you want the display to appear.
On the system you want the display to appear on, you must execute the command xhost +remotehostname, where remotehostname is the name of the host from which you are running the original display. Using the command xhost +remotehostname limits access to the remote display terminal and does not allow access from anyone or any system not specifically authorized for remote access.
mediacheck: this command gives you the option of testing the integrity of the install source (if an ISO-based method). this command works with the CD, DVD, hard drive ISO, and NFS ISO installation methods. Verifying that the ISO images are intact before you attempt an installation helps to avoid problems that are often encountered during an installation.
mpath: enables multipath support.
Important
If you install Red Hat Enterprise Linux 5.11 on a network storage device accessible through multiple paths, you must boot the installation process with this option. If you do not specify this option at boot time, installation will fail, or the system will fail to boot after installation completes.
noeject: do not eject optical discs after installation. This option is useful in remote installations where it is difficult to close the tray afterwards.
noprobe: this command disables hardware detection and instead prompts the user for hardware information.
rescue: this command runs rescue mode. Refer to Chapter 27, Basic System Recovery for more information about rescue mode.
text: this command disables the graphical installation program and forces the installation program to run in text mode.
vnc: this command allows you to install from a VNC server.
vncpassword=: this command sets the password used to connect to the VNC server.
noipv6: this command disables the default selection of ipv6 options during the installer stage 1 processing. Ipv6 settings may still be made manually if this option is specified, but the default behavior will be that Ipv6 settings are not enabled.
cmdline: The 3270 console (most often used during installation on IBM System z) does not recognize terminal formatting entries common to most unix-style terminals. Specifying this option changes the behavior of anaconda during kickstart installations so that console output on the 3270 is much better. This option should not be used for regular, interactive installations.
RUNKS=1: This option is used to specify (usually in conjunction with the cmdline option) kickstart installation for IBM System z.

Chapter 21. Troubleshooting Installation on an IBM System z System

This appendix discusses some common installation problems and their solutions.

21.1. You are Unable to Boot Red Hat Enterprise Linux

21.1.1. Is Your System Displaying Signal 11 Errors?

Ensure that you have the latest installation updates and images from Red Hat. Review the online errata to see if newer versions are available.

21.2. Trouble During the Installation

21.2.1. `No devices found to install Red Hat Enterprise Linux` Error Message

If you receive an error message stating No devices found to install Red Hat Enterprise Linux, then there may be an issue with your DASD devices. If you encounter this error, add the DASD=<disks> parameter to your parm file (where disks is the DASD range reserved for installation) and start the install again.

Additionally, make sure you format the DASDs using the dasdfmt command within a Linux root shell, instead of formatting the DASDs using CMS.

21.2.2. Trouble with Partition Tables

If you receive an error after the Disk Partitioning Setup (Section 17.11, “Disk Partitioning Setup”) phase of the installation saying something similar to

The partition table on device hda was unreadable. To create new partitions it must be initialized, causing the loss of ALL DATA on this drive.

you may not have a partition table on that drive or the partition table on the drive may not be recognizable by the partitioning software used in the installation program.

No matter what type of installation you are performing, backups of the existing data on your systems should always be made.

21.2.3. Other Partitioning Problems

If you are using Disk Druid to create partitions, but cannot move to the next screen, you probably have not created all the partitions necessary for Disk Druid's dependencies to be satisfied.

You must have the following partitions as a bare minimum:

A / (root) partition
A <swap> partition of type swap

Note

When defining a partition's type as swap, do not assign it a mount point. Disk Druid automatically assigns the mount point for you.

21.2.4. Are You Seeing Python Errors?

Traceback (innermost last):
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/iw/progress_gui.py", line 20, in run
rc = self.todo.doInstall ()    
File "/var/tmp/anaconda-7.1//usr/lib/anaconda/todo.py", line 1468, in doInstall 
self.fstab.savePartitions ()    
File "fstab.py", line 221, in savePartitions      
sys.exit(0)  
SystemExit: 0   
Local variables in innermost frame:  
self: <fstab.GuiFstab instance at 8446fe0>  
sys: <module 'sys' (built-in)>  
ToDo object:  (itodo  ToDo  p1  (dp2  S'method'  p3  (iimage  CdromInstallMethod  
p4  (dp5  S'progressWindow'  p6   <failed>

If you experience such an error, first try to download any available errata for anaconda. Errata can be found at:

http://www.redhat.com/support/errata/

The anaconda website may also be a useful reference and can be found online at:

http://fedoraproject.org/wiki/Anaconda

You can also search for bug reports related to this problem. To search Red Hat's bug tracking system, go to:

http://bugzilla.redhat.com/bugzilla/

Finally, if you are still facing problems related to this error, register your product and contact our support team. To register your product, go to:

http://www.redhat.com/apps/activate/

21.3. Problems After Installation

21.3.1. Remote Graphical Desktops and XDMCP

If you have installed the X Window System and would like to log in to your Red Hat Enterprise Linux system using a graphical login manager, enable the X Display Manager Control Protocol (XDMCP). This protocol allows users to remotely log in to a desktop environment from any X Window System compatible client (such as a network-connected workstation or X terminal). To enable remote login using XDMCP, edit the following line in the /etc/gdm/custom.conf file on the Red Hat Enterprise Linux system with a text editor such as vi or nano:

Add the line Enable=true, save the file, and exit the text editor. Switch to runlevel 5 to start the X server:

/sbin/init 5

From the client machine, start remote X session using X. For example:

X :1 -query s390vm.example.com

The command connects to the remote X server via XDMCP (replace s390vm.example.com with the hostname of the remote X server) and displays the remote graphical login screen on display :1 of the client system (usually accessible by using the Ctrl-Alt-F8 key combination).

You may also access remote desktop sessions using a nested X server, which opens the remote desktop as a window in your current X session. Xnest allows users to open a remote desktop nested within their local X session. For example, run Xnest using the following command, replacing s390vm.example.com with the hostname of the remote X server:

Xnest :1 -query s390vm.example.com

21.3.2. Problems When You Try to Log In

If you did not create a user account in the Setup Agent, log in as root and use the password you assigned to root.

If you cannot remember your root password, boot your system as linux single.

If the graphical login screen does not appear, check your hardware for compatibility issues. The Hardware Compatibility List can be found at:

	http://hardware.redhat.com/hcl/

21.3.3. Your Printer Does Not Work

If you are not sure how to set up your printer or are having trouble getting it to work properly, try using the Printer Configuration Tool.

Type the system-config-printer command at a shell prompt to launch the Printer Configuration Tool. If you are not root, it prompts you for the root password to continue.

21.3.4. Apache-based `httpd` service/Sendmail Hangs During Startup

If you are having trouble with the Apache-based httpd service or Sendmail hanging at startup, make sure the following line is in the /etc/hosts file:

127.0.0.1  localhost.localdomain  localhost

Chapter 22. Additional Information for IBM System z Users

22.1. The `sysfs` File System

The Linux 2.6 kernel introduced the sysfs file system. The sysfs file system is described as a union of the proc, devfs, and devpty file systems. The sysfs file system enumerates the devices and busses attached to the system into a file system hierarchy that can be accessed from user space. It is designed to handle the device and driver specific options that have previously resided in /proc/, and encompass the dynamic device addition previously offered by devfs.

The sysfs file system is mounted at /sys/ and contains directories that organize the devices attached to the system in several different ways. The /sysfs/ subdirectories include:

The /devices/ directory
This directory contains the /css0/ directory. Its subdirectories represent all the subchannels detected by the Linux kernel. Subchannel directories are named in the form 0.0.nnnn where nnnn is the subchannel number in hex between 0000 and ffff. Subchannel directories in turn contain status files and another subdirectory which represents the actual device. The device directory is named 0.0.xxxx where xxxx is the unit address for the device. The /devices/ directory also contains status information as well as configuration options for the device.
The /bus/ directory
This contains a /ccw/ subdirectory and a /ccwgroup/ subdirectory. CCW devices are accessed using channel command words. Devices in the /ccw/ directory only use one subchannel on the mainframe channel subsystem. CCW group devices are also accessed with channel command words, but they use more than one subchannel per device. For example, a 3390-3 DASD device uses one subchannel, while a QDIO network connection for an OSA adapter uses three subchannels. The /ccw/ and the /ccwgroup/ directories both contain directories called devices and drivers:
The /devices/ directory contains a symbolic link to the device directories in the /sys/devices/css0/ directory.
The /drivers/ directory contains directories for each device driver currently loaded on the system. Drivers associated with devices such as dasd, console, qeth, and zfcp have directory entries here. The /driver/ directory contains settings for the device driver, as well as symbolic links to the devices it is using (in the /sys/devices/css0/ directory).
The /class/ directory
This contains directories that group together similar devices such as ttys, SCSI tape drives, network devices, and other miscellaneous devices.
The /block/ directory
This directory contains directories for each of the block devices on the system. These are mostly disk type devices such as real DASD, loopback devices, and software raid block devices. The noticeable difference between older Linux systems and ones that use sysfs is the need to refer to devices by their sysfs name. On a 2.4 kernel image, the zFCP driver was passed as its device addresses. On the 2.6 Kernel image system the driver is passed as 0.0.1600.

22.2. Using the `zFCP` Driver

During the initial installation, you are prompted to enter SCSI/FCP information. If this information is entered, it creates the /etc/zfcp.conf file which contains your SCSI configuration. It also adds the line alias scsi_hostadapter zFCP to /etc/modprobe.conf. This loads the required zFCP modules.