Chapter 6. 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 current OS version is Red Hat Enterprise Linux 8:

  # cat /etc/redhat-release
  Red Hat Enterprise Linux release <target_os_version> (Ootpa)

  Replace target_os_version with the target OS version, for example 8.6.

• Check the OS kernel version:

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

  The target_os should be either 8 or the target OS version, for example 8_6. 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:      <target_os_version>
    Arch:         x86_64
    Status:       Subscribed

    Replace target_os_version with the target OS version, for example 8.6.

  • Verify that the release version is set to the target OS version immediately after the upgrade:

    # subscription-manager release
    Release: <target_os_version>

    Replace target_os_version with the target OS version, for example 8.6.

• 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.