Chapter 7. Verifying the post-upgrade state of the RHEL 8 system

Prerequisites

• The system has been upgraded following the steps described in Performing the upgrade from RHEL 7 to RHEL 8 and you have been able to log in to RHEL 8.

• Verify that the Leapp utility has finished all actions in the upgrade process and the system is ready to be used:

  # [ -e "/etc/systemd/system/leapp_resume.service" ] || ps -e | grep -q leapp && echo "Leapp has not finished the execution yet!"

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  Important

  If you attempt to use the system before the upgrade is complete, serious issues could occur.

• Verify that the current OS version is Red Hat Enterprise Linux 8:

  # cat /etc/redhat-release
  Red Hat Enterprise Linux release 8.10 (Ootpa)

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• Check the OS kernel version:

  # uname -r
  4.18.0-305.el<target_os>.x86_64

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  The target_os should be either 8 or 8_10. Note that .el8 is important and the version should not be earlier than 4.18.0-305.

• If you are using the Red Hat Subscription Manager:

  • Verify that the correct product is installed:

    # subscription-manager list --installed
    +-----------------------------------------+
        	  Installed Product Status
    +-----------------------------------------+
    Product Name: Red Hat Enterprise Linux for x86_64
    Product ID:   479
    Version:      8.10
    Arch:         x86_64
    Status:       Subscribed

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  • Verify that the release version is set to RHEL 8.10 immediately after the upgrade:

    # subscription-manager release
    Release: 8.10

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• Verify that network services are operational, for example, try to connect to a server using SSH.
• Check the post-upgrade status of your applications. In some cases, you may need to perform migration and configuration changes manually. For example, to migrate your databases, follow instructions in RHEL 8 Database servers documentation.