Troubleshooting common issues while upgrading from RHEL 8 to RHEL 9
Updated
The RHEL 9 Documentation details all necessary steps for the upgrade process. It is recommended to carefully review the section regarding limitations and requirements as the process is only supported under specific circumstances.
- Upgrading to RHEL 9
- Considerations in adopting RHEL 9
- Supported upgrade paths from RHEL 8 to RHEL 9 upgrade
- In-place upgrade Support Policy
- Customizing your Red Hat Enterprise Linux in-place upgrade
A collection of knowledge base articles describing known issues is listed below.
Please carefully read the articles (in particular the Diagnostic Steps sections) prior to upgrading just in case some may apply to your system, this will prevent a failure to happen and recovery to be difficult or impossible:
Table of Contents
Pre Upgrade step
- RHEL 8 to RHEL 9 in-place upgrade fails with "Error: GPG check FAILED"
- Running leapp upgrade on Content Hosts registered with Red Hat Satellite 6 fails with Message: Unable to install RHEL X userspace packages.
- I want to upgrade RHEL 8 to 9, but RHEL 9 repositories are not listed in RHEL 8
- Leapp Preupgrade check fails with error - "Inhibitor: Firewalld Configuration AllowZoneDrifting Is Unsupported"
- Why does leapp preupgrade fail with error "ParseError: no element found: line 1, column 0"
- RHEL 8 to RHEL 9: inplace upgrade fails at "Network configuration for unsupported device types detected"
Post Upgrade step
- Leapp upgrade fails and drops to emergency mode
- System unable to boot post leapp upgrade from RHEL8 to RHEL 9 failing with
Failed to start Load Kernel Modules - Failed to remove leapp packages with error : package leapp-upgrade-XXX.noarch requires leapp-repository-dependencies, but none of the providers can be installed
- rpm/yum/dnf/subscription-manager show "warning: Signature not supported. Hash algorithm SHA1 not available
Miscellaneous
- The best practices and recommendations for performing RHEL Upgrade using Leapp
- Upgrading SAP environments from RHEL 8 to RHEL 9
- What precautions should be taken post RHEL 8 to RHEL 9 upgrade using Leapp
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