Table of Contents Table of Contents Title and Copyright Information Preface Documentation License Conventions Documentation Accessibility Access to Oracle Support for Accessibility Diversity and Inclusion 1 About Leapp Supported Leapp Features Upgrading Oracle Linux 8 Systems Upgrading Oracle Linux 8 Oracle Cloud Infrastructure Instances Upgrading Oracle Linux 8 KVM Hosts Requirements for Upgrading Kernels Upgradeable With Leapp 2 Preparing for the Upgrade 3 Upgrading the System Assessing the Capability of the System for Upgrading Running the Preupgrade Analyzing the Leapp Report GPG Key Issue Btrfs File System Issue Providing Information to the Leapp Answerfile Performing the Upgrade Verifying the Upgrade 4 Completing Postupgrade Tasks 5 Troubleshooting Oracle Linux Upgrades Tools for Troubleshooting Known Issues Upgrade Issues System Management Issues File Systems and Storage Issues Networking Issues Virtualization and Containers Issues Hardware Related Issues Leapp Overlay Size Issues Low Open Files Limit Issues A Supported Repositories in Leapp Upgrades Repository Mappings Using Command Arguments to Enable Repositories