This script is designed to automatically switch a CentOS instance to Oracle Linux by removing any CentOS-specific packages or replacing them with the Oracle Linux equivalent.
This script currently supports switching CentOS Linux 6, CentOS Linux 7 and CentOS Linux 8. It does not support CentOS Stream.
IMPORTANT: this script is a work-in-progress and is not designed to handle all possible configurations. Please ensure you have a complete backup of the system before you start this process in the event the script is unable to convert the system successfully.
Remove all non-standard kernels i.e. kernels that are not from either the CentOS base or updates repos. Click for more info.
Because of the GRUB2 BootHole vulnerability, our SecureBoot shim can only boot kernels signed by Oracle and we can only replace the default CentOS kernels. While this may not have an impact if SecureBoot is currently disabled, enabling it at a later date could render the system unbootable. For that reason, we strongly recommend removing all non-standard kernels which includes the
centospluskernels.
- Ensure your CentOS
yumordnfconfiguration is working, i.e. there are no stale repositories. - Disable all non-CentOS repositories. You can re-enable the repos after the switch.
- Ensure you have at least 5GB of free space in
/var/cache. - All automatic updates, e.g. via
yum-cronshould be disabled.
- Login to your CentOS Linux 6, 7 or 8 instance as a user who has
sudoprivileges. - Either clone this repository or download the
centos2ol.shscript. - Run
sudo bash centos2ol.shto switch your CentOS instance to Oracle Linux.
-
-rReinstalls all CentOS RPMs with Oracle Linux RPMsIf a system is swiched to Oracle Linux and there is no newer Oracle Linux version of a package already installed then the CentOS version remains. This option proceeds to reinstall any CentOS RPM with an identical version from Oracle Linux. This is not necessary for support and has no impact to a systems functionality but is offered so a user can remove CentOS GPG keys from the truststore. A list of all non-Oracle RPMs will be displayed after the reinstall process.
-
-VVerify RPM information before and after the switchThis option creates four output files:
- sorted list of installed RPMs before the switch
- sorted list of installed RPMs after the switch
- result of verification of all installed RPMs against the RPM database before the switch
- result of verification of all installed RPMs against the RPM database after the switch
- The script currently needs to be able communicate with the CentOS and Oracle Linux yum repositories either directly or via a proxy.
- The script currently does not support instances that are registered to a third-party management tool like Spacewalk, Foreman or Uyuni.
- Compatibility with packages installed from third-party repositories is
expected but not guaranteed. Some software doesn't like the existence of an
/etc/oracle-releasefile, for example. - Packages that install third-party and/or closed-source kernel modules, e.g. commercial anti-virus products, may not work after switching.
- The script only enables the base repositories required to enable switching to Oracle Linux. Users may need to enable additional repositories to obtain updates for packages already installed (see issue #1).
Run sudo bash -x centos2ol.sh to switch your CentOS instance to Oracle Linux in debug mode. This will print a trace of commands and their arguments or associated word lists after they are expanded but before they are executed.
We welcome contributions! See our contribution guidelines.
- Open a GitHub issue for non-security related bug reports, questions, or requests for enhancements.
- To report a security issue or vulnerability, please follow the reporting security vulnerabilities instructions.
For more information on Oracle Linux, please visit https://www.oracle.com/linux.
Copyright (c) 2020 Oracle and/or its affiliates.
Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/