Howto migrate centos7 to 8x
update centos7 repos to use vault.centos.org:
sed -i -e '/^mirrorlist/d;/^#baseurl=/{s,^#,,;s,/mirror,/vault,;}' /etc/yum.repos.d/CentOS*.repo
update to latest packages:
yum update -y
rhel alternatives or derivatives:
cloud images:
https://wiki.vidalinux.org/index.php/Linux_cloud_images
distributions to migrate supported:
- CentOS 7 to AlmaLinux 8
- CentOS 7 to Rocky Linux 8
- CentOS 7 to Oracle Linux 8
- CentOS 7 to CentOS Stream 8
upgrade current system to latest:
yum update -y
verify your current version:
cat /etc/centos-release
install elevate-release package:
yum install http://repo.almalinux.org/elevate/elevate-release-latest-el7.noarch.rpm -y
install leapp-upgrade and migration-data:
Possible options are:
- leapp-data-almalinux
- leapp-data-centos
- leapp-data-oraclelinux
- leapp-data-rocky
yum install leapp-upgrade leapp-data-almalinux -y
start a preupgrade check:
leapp preupgrade
normally the check will fail, it’s normal because we need to do some tweaks:
sudo rmmod pata_acpi echo PermitRootLogin yes | sudo tee -a /etc/ssh/sshd_config sudo leapp answer --section remove_pam_pkcs11_module_check.confirm=True
then run check again:
leapp preupgrade
if everything runs well, upgrade the system:
leapp upgrade
once the migration is completed, you’ll be offered to reboot the system:
reboot
select the new entry in grub called ELevate-Upgrade-Initramfs, wait for the upgrade process to finish.
when system is migrated to el8 run the following command to remove any el7 rpm package:
rpm -qa|grep el7|xargs rpm -e
centos8 to almalinux8
fix mirrors:
sed -i -e "s|mirrorlist=|#mirrorlist=|g" /etc/yum.repos.d/CentOS-* sed -i -e "s|#baseurl=http://mirror.centos.org%7Cbaseurl=http://vault.centos.org%7Cg" /etc/yum.repos.d/CentOS-*
update your system to latest:
yum update -y
download deploy script:
curl -O https://raw.githubusercontent.com/AlmaLinux/almalinux-deploy/master/almalinux-deploy.sh
fix script permissions:
chmod +x almalinux-deploy.sh
run the script:
bash almalinux-deploy.sh
if an error ocurrs with signatures do the following:
rpm --import https://repo.almalinux.org/almalinux/RPM-GPG-KEY-AlmaLinux