In this article, you will learn how to upgrade CentOS 7 to CentOS 8.
The CentOS Project is a community-driven free software effort focused on delivering a robust open source ecosystem around a Linux platform.
Note: Make a server copy before making any updates.
Step 1: Install the EPEL repository
To start off, install the EPL repository by running:
yum install epel-release -y
Step 2: Install yum-utils tools
After successfully installing EPEL, install yum-utils by running the command below.
yum install yum-utils
Thereafter, you need to resolves RPM packages by executing the command.
yum install rpmconf rpmconf -a
Next, perform a clean-up of all the packages you don’t require.
package-cleanup --leaves package-cleanup --orphans
Step 3: Install the dnf in CentOS 7
Now install dnf package manager which is the default package manager for CentOS 8.
yum install dnf
You also need to remove the yum package manager using the command.
dnf remove yum yum-metadata-parser rm -Rf /etc/yum
Step 4: Upgrading CentOS 7 to CentOS 8
We are now ready to upgrade CentOS 7 to CentOS 8, but before we do so, upgrade the system using the newly install dnf package manager.
Next, install CentOS 8 release package using dnf as shown below. This will take a while.
dnf -y upgrade https://mirror.yandex.ru/centos/8/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm
Next, upgrade the EPEL repository.
dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
After successfully upgrading the EPEL repository, remove all the temporary files.
dnf clean all
Remove the old kernel core for CentOS 7.
rpm -e `rpm -q kernel`
Next, be sure to remove conflicting packages.
rpm -e --nodeps sysvinit-tools
Thereafter, launch the CentOS 8 system upgrade as shown.
dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
Step 5: Install the new kernel core for CentOS 8
To install a new kernel for CentOS 8, run the command.
dnf -y install kernel-core
Finally, install CentOS 8 minimal package.
dnf -y groupupdate "Core" "Minimal Install"
Now you can check the version of CentOS installed by running.
This article provides an example of how you can upgrade CentOS 7 to CentOS 8. We hope you found this insightful.