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76 lines
3.0 KiB
76 lines
3.0 KiB
9 months ago
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# Migration guide
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**NOTE: As this project is newly announced we HIGHLY recommend that you follow system administration best practices and make sure you have backups and/or snapshots of your system before you proceed. It is recommended to do a trial run in a sandbox to verify that migration worked as expected before you attempt to migrate any production system.**
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This guide contains steps on how to upgrade CentOS 7 to RHEL8 derivatives such as AlmaLinux, CentOS, Oracle, Rocky.
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To use this guide you need to install Vagrant and VirtualBox using the following
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documentation:
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* [Install VirtualBox](https://www.virtualbox.org/manual/ch02.html)
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* [Install Vagrant](https://www.vagrantup.com/docs/installation)
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* Clone this repo and cd into it
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```
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git clone https://github.com/AlmaLinux/leapp-data.git
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cd leapp-data
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```
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* Start the Virtual Machine.
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```
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vagrant up
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```
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* CentOS 7.9 is required to accomplish the upgrade. Login to VM, install the latest CentOS updates, and reboot.
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```
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vagrant ssh
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sudo yum update -y
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sudo reboot
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```
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* After reboot login to VM again, download the leapp repo file, and install leapp.
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```
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vagrant ssh
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sudo curl https://repo.almalinux.org/elevate/el7/elevate.repo -o /etc/yum.repos.d/elevate.repo
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sudo yum install leapp -y
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```
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* Copy leapp config files for the OS you want to migrate. Possible options are almalinux, centos, eurolinux, msvsphere, oraclelinux, rocky.
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```
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sudo cp /vagrant/files/almalinux/* /etc/leapp/files/
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```
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* Start a preupgrade check. It will fail as the default CentOS 7 doesn't meet all requirements for migration. In the meanwhile, Leapp utility creates a special */var/log/leapp/leapp-report.txt* file that contains possible problems and recommended solutions. No rpm packages will be installed at this phase.
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```
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sudo leapp preupgrade
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```
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This summary report will help you get the picture of whether it is possible to continue the upgrade.
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In certain configurations, Leapp generates */var/log/leapp/answerfile* with true/false questions. Leapp utility requires answers to all these questions in order to proceed with the upgrade.
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* Mentioned fixes from the */var/log/leapp/leapp-report.txt* file are mandatory, but you can also review the rest of them if needed.
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```
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sudo rmmod pata_acpi
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echo PermitRootLogin yes | sudo tee -a /etc/ssh/sshd_config
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sudo leapp answer --section remove_pam_pkcs11_module_check.confirm=True
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```
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* Start an upgrade. After this process is completed you'll be offered to reboot the system.
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```
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sudo leapp upgrade
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sudo reboot
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```
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* A new entry in GRUB called ELevate-Upgrade-Initramfs will appear. The system will be automatically booted into it.
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See how the update process goes in the VirtualBox console.
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* After reboot, login to the system and check how the migration went. Verify that the current OS is the one you need.
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```
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vagrant ssh
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cat /etc/redhat-release
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cat /etc/os-release
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rpm -qa | grep centos
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rpm -qa | grep el7
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```
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