Teach you to migrate the CentOS 8 operating system to Oracle Linux

Oracle Linux is another alternative to CentOS 8. This article describes how to migrate an existing operating system to Oracle Linux.

What is Oracle Linux?

Oracle Linux is compiled from the RedHat Enterprise Linux source code, replacing the Red Hat brand with the Oracle brand. It is also used in Oracle Cloud and Oracle Engineered Systems (such as Oracle Exadata, etc.).

Oracle Linux provides two kernels. The first is the default Linux kernel, which is compiled from the source code of each Red Hat Enterprise Linux (RHEL) release.

The second is the Unbreakable Enterprise Kernel (UEK), which is a Linux kernel built by Oracle and supported through Oracle Linux Support. It focuses on performance, stability, and minimal backports by tracking the mainline source code as closely as possible. UEK is fully tested and used to run Oracle's Engineered Systems, Oracle Cloud Infrastructure, and large enterprise deployments for Oracle customers.

System environment

CentOS 8 Minimal

Check the current Linux operating system

Execute the following command to check the version of the Linux operating system.

[root@localhost ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"

[root@localhost ~]# cat /etc/centos-release
CentOS Linux release 8.0.1905 (Core)

Check the current Linux kernel version.

[root@localhost ~]# uname -r
4.18.0-240.15.1.el8_3.x86_64

Migrate CentOS 8 to Oracle Linux

Oracle Github Repository provides a Linux bash script centos2ol.sh. This script supports migration from CentOS Linux 6, 7, and 8, but does not support CentOS Stream.

The centos2ol.sh script can be easily downloaded from GitHub using the wget or curl command.

[root@localhost ~]# wget https://raw.githubusercontent.com/oracle/centos2ol/main/centos2ol.sh

Add executable permissions to centos2ol.sh:

[root@localhost ~]# chmod +x centos2ol.sh

When ready, execute the centos2ol.sh script to start the migration process of the Linux operating system.

[root@localhost ~]# ./centos2ol.sh

centos2ol.sh script lists the installed packages that your Linux operating system packages have been replaced by the corresponding Oracle Linux supported packages during the migration process.

centos2ol.sh script has done its job. Rebooting your system will boot your operating system with the new Linux kernel.

[root@localhost ~]# reboot

During system startup, the GRUB menu now displays two new entries for Oracle Linux Server. One is for the standard Linux kernel and the other is for the Unbreakable Enterprise Kernel (UEK).

Check for new Linux operating systems:

Check the current operating system version by executing the following command.

[root@localhost ~]# cat /etc/os-release
NAME="Oracle Linux Server"
VERSION="8.4"
ID="ol"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="8.4"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Oracle Linux Server 8.4"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:8:4:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://bugzilla.oracle.com/"

ORACLE_BUGZILLA_PRODUCT="Oracle Linux 8"
ORACLE_BUGZILLA_PRODUCT_VERSION=8.4
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=8.4

[root@localhost ~]# cat /etc/oracle-release
Oracle Linux Server release 8.4

Also check the version of the new Linux kernel:

[root@localhost ~]# uname -r
5.4.17-2102.202.5.el8uek.x86_64

Summarize

Your CentOS 8 operating system has been successfully migrated to Oracle Linux and Unbreakable Enterprise Kernel. Try experimenting with your new operating system and see if it is a good CentOS alternative?

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