Prepare
BACKUP EVERYTHING BEFORE DOING THIS
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sudo setenforce 0
sudo sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
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sudo yum update -y
sudo reboot
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- Install elevate-release from alma
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sudo yum install -y http://repo.almalinux.org/elevate/elevate-release-latest-el$(rpm --eval %rhel).noarch.rpm
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I use Rocky so I need choose leapp-data-rocky
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sudo yum install -y leapp-upgrade leapp-data-rocky
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Check before real update
Don’t know what shit but do it
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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
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Upgrade
Do real upgrade
For myself centos7 cmake3 and python3-pip conflicted with CentOS8, so remove it before
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sudo yum remove cmake3
sudo yum remove python3-pip
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After leapp upgrade
Warning: don’t reboot directly, need rebuild grub at first
depend on various dist, it located in /boot/grub/grub.cfg or/boot/grub2/grub.cfg
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grub2-mkconfig -o /path/to/grub.cfg
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Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-1160.114.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.114.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.71.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.71.1.el7.x86_64.img
done
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When you see ELevate-Upgrade-Initramfs in the grub list then you can reboot, otherwise you will lost your system boot
In ELevate-Upgrade-Initramfs
Waiting ELevate-Upgrade-Initramfs finish running
After Upgrade-Initramfs running
grub always failed that CentOS7 not compatible fine with CentOS8
so in my VM, I also need manually boot at first
- Check which boot file you can use
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grub> ls (hd0)/
bin/ boot/ dev/ ....
grub> cat (hd0)/etc/redhat-releases
Fedora release 27 (Twenty Seven)
grub> ls (hd0)/boot/
.... initramfs-4.14-11-300.fc27.x86_64.img .... vmlinuz-4.14.11-300.fc27.x86_64 ...
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- Set and boot manually (replace
/dev/sda in your situation)
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grub> set root=(hd0)
grub> linux /boot/vmlinuz-4.18.0-513.24.1.el8_9.x86_64 root=/dev/sda
grub> initrd /boot/initramfs-4.18.0-513.24.1.el8_9.x86_64.img
grub> boot
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After Upgrade
Re-install grub2
Manually boot into Rocky and re-install grub2 (force)
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[root@xxx ~]$ grub2-install -force /dev/sda
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Rebuild grub2 config
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[root@xxx ~]$ grub2-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
done
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If you cannot see any boot file in list, please check /etc/default/grub
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## /etc/default/grub
GRUB_ENABLE_BLSCFG=true # set to false
GRUB_TIMEOUT=30
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
.....
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then rebuild grub2 config again
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[root@xxx ~]$ grub2-mkconfig -o /boot/grub/grub.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.18.0-513.24.1.el8_9.x86_64
Found initrd image: /boot/initramfs-4.18.0-513.24.1.el8_9.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.114.2.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.114.2.el7.x86_64.img
Found linux image: /boot/vmlinuz-3.10.0-1160.71.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-1160.71.1.el7.x86_64.img
done
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