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6.2. Performing System Assessment

  1. Install the preupgrade-assistant

    The preupgrade-assistant is a tool that scans the existing Red Hat Enterprise Linux 6 system and checks whether it is ready to be upgraded.
    Subscribe to the required repositories and install the preupgrade-assistant tool using the following commands:
    Copy to Clipboard Toggle word wrap 
    # subscription-manager repos --enable rhel-6-server-extras-rpms --enable rhel-6-server-optional-rpms
# yum install preupgrade-assistant preupgrade-assistant-el6toel7

  2. Run the preupgrade tool

    Launch the preupgrade tool:
    Copy to Clipboard Toggle word wrap 
    # preupg -v

  3. Assess the results

    1. View the following result of the preupgrade tool in a browser:
      Copy to Clipboard Toggle word wrap 
      /root/preupgrade/result.html
    2. Make a note of all the components that are marked as Failed and Needs Action.
    3. Share the findings with the Red Hat executive assisting with the upgrade process.

  4. Check the SELinux policy in Red Hat Enterprise Linux 7

    SELinux policies have changed between Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7. For a working SELinux policy in Red Hat Enterprise Linux 7, execute the following command:
    Copy to Clipboard Toggle word wrap 
    # semodule -r sandbox

  5. Uninstall Cluster and HA related packages

    Migration is not possible with Cluster and HA related packages installed on the system.
    Uninstall Cluster and HA related packages by executing the following command:
    Copy to Clipboard Toggle word wrap 
    # yum remove modcluster ricci openais corosync
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