Chapter 5. Verifying the post-upgrade state of the RHEL 8 system

This procedure lists steps recommended to perform after an in-place upgrade to RHEL 8.

Prerequisites

Procedure

After the upgrade completes, determine whether the system is in the required state, at least:

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

    # cat /etc/redhat-release
    Red Hat Enterprise Linux release 8.2 (Ootpa)
  • Check the OS kernel version:

    # uname -r
    4.18.0-193.el8.x86_64

    Note that .el8 is important.

  • 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:      8.2
      Arch:         x86_64
      Status:       Subscribed
    • Verify that the release version is correctly set to 8.2:

      # subscription-manager release
      Release: 8.2

      Note that when the release version is set to 8.2, you will be receiving yum updates only for this specific version of RHEL. If you want to unset the release version to be able to consume updates from the latest minor version of RHEL 8, use the following command:

      # subscription-manager release --unset
  • 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.