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  1. #1

    RHEL upgrade from 4u9 to 6


    I want to upgrade RHEL 4u9 to 6.1:

    Please send me the comparison issues between the versions and the applications compatibility along with their file system compatibility.

  2. #2
    Trusted Penguin Irithori's Avatar
    Join Date
    May 2009
    That is a bit much to ask.
    But thankfully RedHat maintains release notes for every new version:

    Red Hat Enterprise Linux 5.0 Release Notes
    Red Hat Enterprise Linux 5.1 Release Notes
    Red Hat Enterprise Linux 5.2 Release Notes
    5.3 Release Notes
    5.4 Release Notes
    5.5 Release Notes
    5.6 Release Notes
    5.7 Release Notes

    6.0 Release Notes
    6.1 Release Notes
    6.2 Release Notes

    And also technical notes:

    In general I would advise to
    1) backup
    - configs
    - data
    - logs

    2) Then install the newest redhat available (6.2) on a new machine in parallel.
    3) Migrate the server configs.
    4) Then import the data
    5) Test
    6) Automate the deploy
    7) Document the deploy
    9) Switch over to the new setup

    These are of course milestones, the detailed and actual workflow depends on your specific setup/data.
    You must always face the curtain with a bow.

  3. #3
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    Irithori gave you some great links, but the short story is that an upgrade from 4.x to 6.x is not straight-forward. It is HIGHLY recommended that you do a clean installation of 6.x, reinstall all standard packages you need, and then rebuild ALL of your custom applications. Finally, you need to do a LOT of testing to find where stuff is still going to break. As an analogy, going from 4.x to 6.x is kind of like upgrading your personal transportation from horse&buggy to a BMW 700 series roadster. There will be a lot of changes. So, keep your 4.x system running and install 6.x on another box, or in a virtual machine, until you are satisfied that you have dotted all of the i's and crossed all of the t's.

    FWIW, I moved last year from 5.x to 6.x, and there are still some things that don't work like I'd prefer... All in all, however, the upgrade was waaay worth the pain and suffering. Better hardware support is just the start, but also better support for newer applications that I wanted to use.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

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