The tutorial for upgrading from Centos7 to Centos8 (detailed graphic)

If you are upgrading in a formal environment, please do a good job of data backup and important configuration backup! Because the upgrade will cause some applications to be uninstalled.

1. Install epel source

yum -y install epel-release

2. Install rpmconf and yum-utils

yum -y install rpmconf yum-utils

3. Execute rpmconf, if there are some prompts, please enter Y and press Enter to continue, if there is no prompt, continue to the fourth step

rpmconf -a

4. Install dnf

yum -y install dnf

5. Remove yum and yum-metadata-parser

dnf -y remove yum yum-metadata-parser

6. Delete the /etc/yum directory

rm -rf /etc/yum

7. Install Centos8 source and upgrade epel source

dnf -y upgrade
dnf -y upgrade http://mirrors.163.com/centos/8.0.1905/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm
dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
dnf clean all

8. Uninstall the centos7 kernel

rpm -e --nodepsrpm -q kernel``

9. Upgrade to centos8, this step will usually report an error, if there is no error, please proceed to step 10

dnf -y --releasever=8--allowerasing --setopt=deltarpm=false distro-sync

After discovering the error, uninstall the package name that is similar to the from package on the picture

rpm -e --nodeps sysvinit-tools-2.88-14.dsf.el7.x86_64
rpm -e --nodeps python-inotify-0.9.4-4.el7.noarch
rpm -e --nodeps adwaita-qt5-1.0-1.el7.x86_64
rpm -e --nodeps pycairo-1.8.10-8.el7.x86_64

Perform the upgrade again after uninstalling

dnf -y --releasever=8--allowerasing --setopt=deltarpm=false distro-sync

10. Run rpmconf, the following interface will appear, keep typing Y and press Enter.

rpmconf -a

11. Restart the machine

reboot

to sum up

The above is the tutorial for upgrading from Centos7 to Centos8 introduced by the editor. I hope it will be helpful to you. If you have any questions, please leave me a message, and the editor will reply to you in time. Thank you very much for your support to the ZaLou.Cn website!
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