How to Upgrade Linux Server from CentOS 7 to CentOS 8

Upgrade CentOS 7 to CentOS 8 Linux Server

Source: https://netshop-isp.com.cy/blog/how-to-upgrade-centos-7-to-centos-8

In this article, you will learn how to upgrade your Linux dedicated or virtual server from CentOS 7 to CentOS 8.

Step 1: Install the EPEL Repository

# yum install epel-release -y

Step 2: Install yum-utils Tools

# yum install yum-utils

After the above step, you now need to resolve the RPM packages by executing the commands:

# yum install rpmconf
# rpmconf -a

Next, perform a clean up of all the packages you don’t require with the following commands:

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

Step 3: Install the dnf in CentOS 7

DNF is the default package manager in CentOS 8. Install it by executing the following command:

# yum install dnf

Now remove the yum package manager:

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

Step 4: Upgrade CentOS 7 to CentOS 8

First upgrade the dnf package manager:

# dnf upgrade

Next, install CentOS 8 release package using dnf as shown below. This will take a while.

# dnf install http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-repos-8.2-2.2004.0.1.el8.x86_64.rpm http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-release-8.2-2.2004.0.1.el8.x86_64.rpm http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/centos-gpg-keys-8.2-2.2004.0.1.el8.noarch.rpm

Next, upgrade the EPEL repository as follows:

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

Now, remove all the temporary files by executing the following command:

# dnf clean all

Remove the old CentOS 7 kernel core

# rpm -e `rpm -q kernel`

Then you need to remove all conflicting packages:

# rpm -e --nodeps sysvinit-tools

Thereafter, launch the CentOS 8 system upgrade as shown below:

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

Step 5: Install the New Kernel Core for CentOS 8

# dnf -y install kernel-core

You are now ready to install CentOS 8 minimal package:

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

The CentOS 7 to CentOS 8 upgrade task has been completed! You may issue the following command to verify:

# cat /etc/redhat-release

If you are a NetShop ISP Fully Managed Hosting Customer, you may simply drop an email to the Support team to upgrade your CentOS 7 server to CentOS 8. Alternatively, should you wish to perform the upgrade on your own feel free to use this article with the steps described above.

The procedure has been tested at NS Labs for the purposes of drafting this Linux tutorial.

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