Upgrade to 6.0

[Nicosia Gaetano]

Hi Rick,

Thank You.

Best Regards
Gaetano

Il 11/11/2010 18:11, Rick Stevens ha scritto:
> On 11/11/2010 05:54 AM, Nicosia Gaetano wrote:
>> Hi to All,
>>
>> On my server is installed RHEL 5.5. RedHat has released RHEL 6.0.
>>
>> How can upgrade from 5.5 to 6.0 ?
>
> I have never done an upgrade where the jump between versions is that
> big and I'm not sure it's a good idea.  RHEL5 was based on Fedora 6,
> while RHEL6 is based on Fedora 12, and that's a HUGE difference.
>
> Ordinarily, one would boot the media and choose the "Upgrade" option
> from the first screen.  Because this is a big technology jump, the
> option may not even be offered.
>
> Regardless of what you do, I HIGHLY suggest you back up your system
> fully (at least back up all the user's home directories and such).
> Once that's done, you can try an upgrade (if the boot disk offers it).
> I'd still suggest you do a full reinstall, complete with purging the
> hard drives, then restore the user directories and other things you
> need from the backup.
>
> If you don't have a backup mechanism, I can offer this shell script:
> ---------------------------- CUT HERE ----------------------------------
> #!/bin/bash
> # Back up system to a specific directory given on the command line.
> # If no directory is given, it will back up to my 500GB USB drive's
> # "Backups" directory with a directory name based on my hostname and
> # today's date.
> #
> # Caveats:
> # 1. Make sure you unmount any NFS volumes you may have mounted.  It's
> # also suggested that you unmount any non-OS related mounts.  This
> # script backs up EVERYTHING, whether it's local on the machine or
> # remote mounts.
> #
> # 2. Make sure the target drive has enough space to hold EVERYTHING
> # that remains on your system after unmounting the NFS volumes and
> # other non-OS related mounts.  It's a bitter thing when you run out
> # of space on the target and have to restart this script.
> #
> # 3. Things in the /etc/skipdirs.rsync file will NOT be backed up.
> # This typically excludes the _contents_ of the /proc, /sys, /dev and
> # /media directories, as the contents of those are transient and
> # created by the system at startup.  The directories themselves will
> # be backed up, but not their _contents_.
>
> # And here we go!
> MYHOST=`hostname`
> TODAY=`date +%d-%b-%Y`
> if [ $# -lt 1 ]; then    # Did we get a directory on the command line?
>     TGT="/media/500GB-Drive/Backups/$MYHOST-BackUp-$TODAY"
>             # Nope, create one and use it.
> else            # Yes, we were given a directory, so...
>     TGT=$1        # ...use that name
> fi
>
> rsync -avXA --exclude-from=/etc/skipdirs.rsync / $TGT
>             # And back things up
> ---------------------------- CUT HERE ----------------------------------
>
> I'd save the lines between the "CUT HERE" lines to a file, say
> /usr/local/bin/backupsys, and "chmod 755 /usr/local/bin/backupsys" to
> make it executable.
>
> The "/etc/skipdirs.rsync" file mentioned in the script contains
> entries, one per line, to skip while backing up.  My version contains:
>
>     /proc/*
>     /sys/*
>     /dev/*
>     /media/*
>
> Note that this will backup the directories themselves but not their
> contents.  A restore from this backup would recreate the directories
> but let the system recreate the contents as it normally would.
>
> To run the backup script, become the root user and:
>
>     # /usr/local/bin/backupsys [/path/to/desired/backup/directory]
>
> Hope that helps.  Again, I'd do a full reinstall.  This is a significant
> technology jump.
> ----------------------------------------------------------------------
> - Rick Stevens, Systems Engineer, C2 Hosting          ricks at nerd.com -
> - AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
> -                                                                    -
> -                 IGNORE that man behind the keyboard!               -
> -                                                - The Wizard of OS  -
> ----------------------------------------------------------------------
>
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