Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Scaricare il pdf (Pagina 119)

Chapter 6. Configuring an NFS/FTP server 99

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6.3.1 Copying from physical CDs or a DVD

RHEL 6 is distributed on physical CDs or files that are ISO images of CDs. RHEL 6 is also

distributed on a single physical DVD disc as a single ISO image. It is easier to work with a

single DVD ISO image than to work with multiple CD ISO images, so this approach is

recommended.

In the event that you have a physical DVD, but not an ISO image, you should create an ISO

image. You could skip creating the ISO image and copy the data directly from the DVD to the

installation tree, but creating the ISO image is recommended so you have a reference file.

Be sure your PC has a DVD drive, not just a CD drive (if you have a PC that only has a CD

drive, you can create ISO images of the CDs, but this task is not described in this book). Put

the DVD in the tray and use the dd command to create the ISO image. The device file named

/dev/cdrom is often associated with the CD/DVD drive, but your device file name may be

different. If so, you must determine the correct name.

Run these commands only if you are starting with a physical DVD disc:

# cd /nfs

# dd if=/dev/cdrom of=rhel-6-server-s390x-dvd.iso

# umount /mnt/cdrom

You should now have an ISO image of the DVD.

6.3.2 Verifying the ISO image

An important early step is to verify the integrity of DVD ISO image. This is done by comparing

the checksum value that was calculated when the DVD was created against a checksum

value calculated against your ISO image. If the two checksum values differ, then there was an

error somewhere in the copying process.

The md5sum command allows you to compare checksum files. The checksum value for

RHEL 6 for the s390x architecture is as follows:

# cat MD5SUM

9d7aac4bb79db67b1add308be7019760

Run the md5sum command against the MD5SUM file:

# md5sum -c MD5SUM

rhel-server-6.0-s390x-dvd.iso: OK

If the ISO image does not report OK, it must be downloaded or copied again until it does.

Important: Yo ur MD5SUM file may have checksum values for the DVD and the CD ISO

images. If this is true and you only have one DVD ISO image, md5sum will generate errors

similar to the following form:

md5sum: rhel-server-6.0-s390x-dvd.iso: No such file or directory

rhel-server-6.0-s390x-dvd.iso: FAILED open or read

This is not a problem as long as the DVD ISO image is reported as OK.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 119