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Chapter 6. Verifying the post-upgrade state of the RHEL 9 system

This procedure lists verification steps recommended to perform after an in-place upgrade to RHEL 9.



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

  • Verify that the current OS version is RHEL 9:

    # cat /etc/redhat-release
    Red Hat Enterprise Linux release 9.0 (Plow)
  • Check the OS kernel version:

    # uname -r

    Note that .el9 is important and the version should not be earlier than 5.14.0.

  • 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:      9.0
      Arch:         x86_64
      Status:       Subscribed
    • Verify that the release version is set to 9.0 immediately after the upgrade:

      # subscription-manager release
      Release: 9.0
  • 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 Configuring and using database servers.