红帽全球峰会第 4 章 Reviewing the pre-upgrade report
To assess upgradability of your system, start the pre-upgrade process by using the leapp preupgrade command. During this phase, the Leapp utility collects data about the system, assesses upgradability, and generates a pre-upgrade report.
4.1. About the pre-upgrade report
The pre-upgrade report summarizes potential problems and suggests recommended solutions. The report also helps you decide whether it is possible or advisable to proceed with the upgrade.
Reviewing a pre-upgrade report can also be useful if you want to perform a fresh installation of a RHEL 9 system instead of the in-place upgrade process.
Always review the entire pre-upgrade report, even when the report finds no inhibitors to the upgrade. The pre-upgrade report contains recommended actions to complete before the upgrade to ensure that the upgraded system functions correctly.
The pre-upgrade assessment does not modify the system configuration, but it does consume non-negligible space in the /var/lib/leapp directory. In most cases, the pre-upgrade assessment requires up to 4 GB of space, but the actual size depends on your system configuration. If there is not enough space in the hosted file system, the pre-upgrade report might not show complete results of the analysis. To prevent issues, ensure that your system has enough space in the /var/lib/leapp directory or move the directory to a dedicated partition so that space consumption does not affect other parts of the system.
You can assess upgradability in the pre-upgrade phase using either of the following ways:
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Review the pre-upgrade report in the generated
leapp-report.txtfile and manually resolve reported problems using the command line. - Use the web console to review the report, apply automated remediations where available, and fix remaining problems using the suggested remediation hints.
You can process the pre-upgrade report by using your own custom scripts, for example, to compare results from multiple reports across different environments. For more information, see Automating your Red Hat Enterprise Linux pre-upgrade report workflow.
The pre-upgrade report cannot simulate the entire in-place upgrade process and therefore cannot identify all inhibiting problems with your system. As a result, the Leapp utility might still terminate your in-place upgrade even after you have reviewed and remediated all problems in the report. For example, the pre-upgrade report cannot detect issues related to broken package downloads.
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