How to upgrade CentOS from 7 to 8 ​

Table of Contents

How to upgrade CentOS from 7 to 8

 

 

 

The new version of CentOS 8 offers the latest technologies, packages, and services and will continue to be supported until 2029. There is no official way to upgrade from CentOS 7 to CentOS 8, but unofficially it can be done. Production servers should not use such a procedure. Take a snapshot of your VPS before upgrading, so that you can restore it if necessary. So let’s start the upgrading process.

 

 

 

 

 

 

 

Step 1: Cleaning Up your current system

 

 

 

 

You should clean up your current system before you install CentOS 8 in order to avoid leftovers, unneeded packages, or conflicts.

 

 

First, ensure your system is up to date. Run the following command:

 

# yum update -y 

 

 

Install epel-release repository:

 

# yum install -y epel-release

 

Install the yum-utils and rpmconf packages:

 

 

# yum install -y yum-utils rpmconf

 

We’ll use rpmconf now that it has been installed to resolve our rpm packages:

 

 

# rpmconf -a

 

 

Lastly, ensure that any orphaned or unneeded packages have been removed:

 

 

 

package-cleanup --leaves
package-cleanup --orphans

 

 

 

 

 

 

Step 2: Replacing Packages

 

 

 

 

 

The next step involves replacing the important package and repository repositories with their CentOS 8 equivalents.  

 

 

 

Install the DNF package manager, which uses rpm packages:

 

 

 

# yum install -y dnf

 

 

Remove the yum package manager:

 

 

dnf -y remove yum yum-metadata-parser
rm -Rf /etc/yum

 

You should then run a DNF system update:

 

 

# dnf upgrade -y

 

 

Next, install the CentOS 8 packages:

 

 

 

# dnf install http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/{centos-release-8.1-1.1911.0.8.el8.x86_64.rpm,centos-gpg-keys-8.1-1.1911.0.8.el8.noarch.rpm,centos-repos-8.1-1.1911.0.8.el8.x86_64.rpm}

 

 

And upgrade the EPEL repository:

 

 

# dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

 

 

As a last step, delete all temporary files:

 

 

# dnf clean all

 

 

 

 

 

Step 3: Install the New Kernel and Release

 

 

 

 

 

 

Installation of the new Linux kernel and the new CentOS 8 release is the last step in switching over to CentOS 8.

 

 

 

First, remove the old kernel:

 

 

# rpm -e `rpm -q kernel`

 

 

If there are any conflicting packages, remove them:

 

 

# rpm -e --nodeps sysvinit-tools

 

 

Upgrade CentOS 8:

 

 

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

 

 

 

To install the new kernel core, follow the command:

 

 

# dnf -y install kernel-core

 

 

After that, Run the CentOS 8 Minimal install:

 

 

# dnf -y groupupdate "Core" "Minimal Install"

 

 

 

 

 

 

Based on the os-release and redhat-release files, you can verify your CentOS version. Thanks for reading! I hope it was informative for you! 

 

 

 

 

 

 

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