2023-09-22 08:30:00
CentOS 7 reaches the end of its useful life June 30, 2024, which marks the end of CentOS project after what CentOS 8 was prematurely discontinued on December 31 in favor of CentOS Stream.
Fortunately, you can migrate from CentOS 7 a AlmaLinux 8 or any major Enterprise 8.x RHEL distribution, such as Oracle Linux 8 , Rocky Linux 8 o CentOS Stream 8, using Elevate Project .
table of Contents
What is elevate? Step 1: Upgrade CentOS 7 system Step 2: Install Elevate Repository on CentOS 7 Step 3: Install Leapp utility on CentOS 7 Step 4: Migrate CentOS 7 to AlmaLinux 8
What is Elevate?
Elevate is a utility developed by AlmaLinux designed to facilitate migration from CentOS 7 or any major version of RHEL-based distributions of 7.x a 8.x and of 8.x a 9.x. Provides the tool Leap which starts the actual upgrade process from one version to another.
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The update of CentOS 7 For any major RHEL-based distribution, follow the instructions below, as illustrated in the diagram below.
Migrate CentOS 7 to AlmaLinux 8
If you are looking to change CentOS 7 a AlmaLinux 8 , then you have come to the right place. In this guide, we will guide you on how to migrate from CentOS 7 a AlmaLinux 8 using Elevate Project .
Preliminary step
As is always recommended before migrating to any major version, it is wise to have a backup of your files in case something goes wrong during the upgrade. So, take some time and backup all important files.
Step 1: Update CentOS 7 system
To take off, log in to your instance CentOS 7 and update the system to the latest version by running the following yum command .
$ sudo yum update
Update CentOS 7 Linux
Once the update is complete, verify that CentOS 7 has been updated to the latest version as follows.
$ cat /etc/redhat-release $ cat /etc/os-liberación
You should get the following as a result confirming that CentOS 7 has been updated to the latest version.
CentOS Linux version 7.9.2009 (Core)
Check CentOS 7 Linux
Step 2: Install Elevate Repository on CentOS 7
The next step is to enable the repository by Elevate in your system CentOS 7 by running the following command:
$ sudo yum install -y
Enable elevated repository in CentOS 7
To confirm that Elevate has been installed successfully, run the following “raise-release”… rpm command.
$ rpm -qi elevate-release
You should get the following output which provides complex details about the package high launch including version, release, architecture, installation date, and more.
Confirm elevate the repository
Step 3: Install Leapp utility on CentOS 7
The repository by Elevate provides the utility Leap which facilitates the actual migration of distributions of Red Hat Enterprise Linux 7.x to any version from Enterprise Linux 8.x.
For example, to migrate from CentOS 7 a AlmaLinux 8 install the following software packages.
$ sudo yum install -y leapp-upgrade leapp-data-almalinux
Install Leapp on CentOS 7
Step 4: Migrate CentOS 7 to AlmaLinux 8
Once the migration packages have been installed successfully, run the upgrade checklist pre-flight using the following command:
$ sudo leapp upgrade
The utility performs a series of checks to confirm whether the system is ready to switch to AlmaLinux 8 . CentOS 7 has some inherent issues that prevent the migration from happening, as seen in the bug report below.
Run the pre-flight check update
The report prior to update is generated and saved to the file /var/log/leapp/leapp-report.txt . From here, you can see all the issues preventing migration to AlmaLinux .
In our case, we ran into a couple of problems. First, our system had two cores; something that makes migration to AlmaLinux 8 . Your system must have a single core.
To check the number of installed kernels, run the command:
$ rpm -q kernel
Check installed kernel
If your system has several kernels, as is our case, delete all of them and keep only one using the following command.
$ sudo package-cleanup –oldkernels –count=1
Once again, check the number of cores present in your system as follows.
$ rpm -q kernel
Check installed kernel
To troubleshoot the remaining issues, run the following commands, which enable remote login using the protocol SSH .
$ sudo echo PermitRootLogin yes | sudo tee -a /etc/ssh/sshd_config
Then run the following command to remove the module pam_pkcs11 in settings of PAM
$ sudo leapp answer –section remove_pam_pkcs11_module_check.confirm=True
Finally, disable the module stain_acpi .
$ sudo rmmod pata_acpi
This time, we only have one core left, which is great!
After fixing all the issues, go ahead and perform the migration. CentOS 7 a AlmaLinux 8 by running the following command:
$ sudo leapp upgrade
This is a long process and takes quite a bit of time. Upon successful execution of the command, a report will be generated and this time, everything indicates that everything went as planned.
Actualice CentOS 7 to AlmaLinux 8
Then reboot your system.
$ reboot
On the menu of GRUB you will find the entry ‘ Elevate-Update ‘. Press TO ENTER .
Choose the ELevate upgrade
The update to AlmaLinux 8 It will continue and the system will reboot a few times.
Upgrade to AlmaLinux 8
Finally, the login screen will appear. Provide your password and click ‘ Log in ‘ or press TO ENTER to log in.
Log in to AlmaLinux 8
In the terminal, check the version of AlmaLinux using the following command.
$ cat /etc/redhat-release
Check AlmaLinux version
Alternatively, run the command.
$ cat /etc/os-release
Check AlmaLinux version
The result confirms that we have successfully changed or migrated from CentOS 7 a Almalinux 8.7 .
Conclusion
In this guide, we have demonstrated how to migrate from CentOS 7 a AlmaLinux 8 using the project Elevate which is an application that helps simplify the switch from Enterprise 7.x to Enterprise 8.x systems.
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