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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LEARN ABOUT CENTOS
redhat-upgrade-tool-cli
REDHAT-UPGRADE-TOOL(8) redhat-upgrade-tool User Manual REDHAT-UPGRADE-TOOL(8)
NAME
redhat-upgrade-tool - Red Hat Upgrade tool
SYNOPSIS
redhat-upgrade-tool [OPTIONS] SOURCE
DESCRIPTION
redhat-upgrade-tool is the Red Hat Upgrade tool.
The redhat-upgrade-tool client runs on the system to be upgraded. It determines what packages are needed for upgrade and gathers them from
the source(s) given. It also fetches and sets up the boot images needed to run the upgrade and sets up the system to perform the upgrade at
next boot.
The actual upgrade takes place when the system is rebooted, using the boot images set up by redhat-upgrade-tool. The upgrade initrd starts
the existing system (mostly) as normal, lets it mount all the local filesystems, then starts the upgrade.
When the upgrade finishes, it reboots the system into the newly-upgraded OS.
OPTIONS
Optional arguments
-h, --help
Show a help message and exit.
-v, --verbose
Print more info.
-d, --debug
Print lots of debugging info.
--debuglog DEBUGLOG
Write debugging output to the given file. Defaults to /var/log/redhat-upgrade-tool.log.
--reboot
Automatically reboot to start the upgrade when ready.
SOURCE
These options tell redhat-upgrade-tool where to look for the packages and boot images needed to run the upgrade. At least one of these
options is required.
--device [DEV]
Device or mountpoint of mounted install media. If DEV is omitted, redhat-upgrade-tool will scan all currently-mounted removable devices
(USB disks, optical media, etc.)
--iso ISO
Installation image file.
--network VERSION
Online repos matching VERSION (a number or "rawhide")
Multiple sources may be used, if desired.
Additional options for --network
--enablerepo REPOID
Enable one or more repos (wildcards allowed).
--disablerepo REPOID
Disable one or more repos (wildcards allowed).
--addrepo REPOID=[@]URL
Add the repo at URL. Prefix URL with @ to indicate that the URL is a mirrorlist.
--instrepo REPOID
Get upgrader boot images from the repo named REPOID. The repo must contain a valid .treeinfo file which points to the location of
usable kernel and upgrade images.
Cleanup commands
--resetbootloader
Remove any modifications made to bootloader configuration.
--clean
Clean up everything written by redhat-upgrade-tool.
EXAMPLES
redhat-upgrade-tool --network 7.0 --instrepo <repo URL>
Upgrade to RHEL 7.0 by downloading all needed packages and data from the specified repository.
redhat-upgrade-tool --device --network 7.0
Upgrade to RHEL 7.0 using install media mounted somewhere on the system, fetching updates from the network if needed.
EXIT STATUS
0
Success.
1
Cancelled by user, failure writing files to disk, or other unknown error
2
Failed to download/copy files from the given SOURCE
3
RPM upgrade transaction test failed
BUGS
The --iso image must be on a filesystem listed in /etc/fstab.
AUTHORS
Will Woods <wwoods@redhat.com>
redhat-upgrade-tool 11/08/2013 REDHAT-UPGRADE-TOOL(8)