Upgrade CentOS 7 To Rocky Linux 8
Rocky Linux is a derivative of Red Hat Enterprise Linux. Rocky Linux was conceived after the announcement that CentOS would be focusing on CentOS Stream. Discontinuing the CentOS project as we know it. After this announcement, one of the original creators of the CentOS project spawned Rocky Linux. On their website, they state “Rocky Linux is an open-source enterprise operating system designed to be 100% bug-for-bug compatible with Red Hat Enterprise Linux®. It is under intensive development by the community.” As in our article, Convert a CentOS 7 VPS to an AlmaLinux 8 VPS. In this article, we will repeat the process but this time we will Migrate from CentOS 7 to Rocky Linux 8.
Update the CentOS 7 Instance
You need to ensure all of the packages are up-to-date on the system you are migrating to Rocky Linux 8. So issue the update command followed by the reboot command to boot into the latest Kernel if not already used.
yum update -y && rebootInstall Elevate
As in our other blog post, Elevate is the utility used to migrate between Red Hat Enterprise Linux derivatives. Consequently, this bit of the process is the same for all RHEL-based Operating Systems. For the purpose of this guide, we have shortened the process. To see the full process with commands for different Red Hat Enterprise Linux derivatives, click here.
yum install http://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm -y && yum install leapp-upgrade leapp-data-rocky -yPreflight Check
Now we must run a dependency check. If you do not run this the migration from CentOS 7 to Rocky Linux 8 will fail. The dependency check will fail by default.
leapp preupgrade
Now issue the below commands to resolve the default dependency errors.
rmmod pata_acpi
&& echo PermitRootLogin yes | tee -a /etc/ssh/sshd_config && leapp answer --section remove_pam_pkcs11_module_check.confirm=TrueIf you run another preupgrade command in the console, at this point you should see this.
Start Migration From CentOS 7 to Rocky Linux 8
Now you are at the point where you are ready to upgrade from CentOS 7 VPS to Rocky Linux 8. Before proceeding ensure you have a Snapshot or Backup to fall back to. To start the migration enter the below command. The process will take a few minutes.
leapp upgrade
Once the process has been completed, reboot the server. The upgrade from CentOS 7 to Rocky Linux 8 can be monitored in the console from your client area. To confirm you are now using Rocky Linux 8 issues the below command.
cat /etc/redhat-release
Rocky Linux release 8.8 (Green Obsidian)
Additional Resources
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