08-20-2012
Thanks fpmurphy!...It worked !...I followed your steps and upgraded to CentOS 5.8.
I have couple of queries which I could not understand during the upgrade. Kindly clarify the below queires:
1.I have image CentOS 5.8 ISO image in the hard drive and I tried to mount this to virtual machine running with CentOS 5.7 and it got mounted as (/media/CentOS_5.8_Final). When I checked the contents in the mounted directory (/media/CentOS_5.8_Final) , i could see lot of release notes and few directories like isolinux,Centos,etc.,. but unable to find the ISO image file..
In this scenario, i was unable to perform the upgrade.Later I burnt the Centos 5.8 ISO image file in the DVD and mounted it. By doing this , i could see the ISO image file .
Please clarify what is the difference when we mount the ISO image from the hard drive and the same image burnt in DVD ?
2.I mounted the ISO image and ran "yum list"..and got error. Later then I connected my system to internet and re-run "yum list" and it worked.
To upgrade from 5.7 to 5.8 , Do we need internet connection mandatory, without internet connection can't we do the upgrade.?.
Please clarfiy these two questions..so that it would be helpful to understand.
Thanks,
Ananth
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hdik(8) BSD System Manager's Manual hdik(8)
NAME
hdik -- lightweight tool to attach and mount disk images in-kernel
SYNOPSIS
hdik imagefile [options]
DESCRIPTION
hdik is a lightweight tool that can be used to attach disk images in-kernel (i.e. without a user-land process to provide the backing store).
Only a subset of disk images can be mounted in this manner including read/write disk images, UDIF disk images that use zlib compression,
shadowed disk images, and sparse disk images.
hdik is intended for use in situations where linking against the DiskImages framework is problematic or an extremely lightweight mechanism
for attaching a disk image is needed.
You can specify that the image should not be processed by Disk Arbitration by specifying the -nomount option. You can also specify that the
image be mounted with a shadow file by using the -shadow option.
The following argument must be specified:
imagefile the disk image to be mounted.
OPTIONS
-shadow [shadowfile]
Use a shadow file in conjunction with the data in the image. This option prevents modification of the original image and allows
read-only images to be used as read/write images. When blocks are being read from the image, blocks present in the shadow file
override blocks in the base image. When blocks are being written, the writes will be redirected to the shadow file. If not
specified, -shadow defaults to <imagename>.shadow. If the shadow file does not exist, it is created.
-nomount Suppress automatic mounting of the image or partitions on it. This will result in /dev entries being created, but will not mount
any volumes.
-drivekey keyname=value
Specify a key/value pair for the IOHDIXHDDrive object created (shows up in the IOKit registry of devices which is viewable with
ioreg(8)).
SEE ALSO
hdiutil(1), diskarbitrationd(8), diskutil(8), ioreg(8)
Mac OS X 29 Apr 2003 Mac OS X