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Install the EPEL repository

First, install the EPL repository by running the following command:

[root@localhost www.linuxidc.com] # yum install epel-release-y install yum-utils tool

After successfully installing EPEL, install yum-utils by running the following command.

[root@localhost www.linuxidc.com] # yum install yum-utils installs yum-utils in CentOS 7

Then you need to parse the RPM package by executing the command.

[root@localhost www.linuxidc.com] # yum install rpmconf [root@localhost www.linuxidc.com] # rpmconf-a keep the default RPM setting

Next, clean up all unwanted packages.

[root@localhost www.linuxidc.com] # package-cleanup-- leaves [root@localhost www.linuxidc.com] # package-cleanup-- orphans

Clean up the RPM package

Install dnf in CentOS 7

Now install the dnf package manager, which is the default package manager for CentOS 8.

[root@localhost www.linuxidc.com] # yum install dnf installs dnf in CentOS 7

You also need to remove the yum package manager using the following command.

[root@localhost www.linuxidc.com] # dnf-y remove yum yum-metadata-parser [root@localhost www.linuxidc.com] # rm-Rf / etc/yum

Delete Yum in CentOS 7

Upgrade CentOS 7 to CentOS 8

We are now ready to upgrade CentOS 7 to CentOS 8, but before we do that, upgrade the system with the newly installed dnf package manager.

[root@localhost www.linuxidc.com] # dnf upgrade upgrade CentOS 7

Next, install the CentOS 8 distribution using dnf as shown below. It's gonna take a while.

[root@localhost www.linuxidc.com] # dnf-y upgrade http://mirror.bytemark.co.uk/centos/8/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm install CentOS 8 version

Next, upgrade the EPEL repository.

[root@localhost www.linuxidc.com] # dnf-y upgrade https://dl.Fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

Upgrade the EPEL repository

After successfully upgrading the EPEL repository, delete all temporary files.

[root@localhost www.linuxidc.com] # dnf clean all

Remove the old kernel for CentOS 7.

[root@localhost www.linuxidc.com] # rpm-e `rpm-Q kernel`

Next, be sure to remove conflicting packages.

[root@localhost www.linuxidc.com] # rpm-e-nodeps sysvinit-tools

After that, start the CentOS 8 system upgrade as shown in the figure.

[root@localhost www.linuxidc.com] # dnf-y-releasever=8-allowerasing-setopt=deltarpm=false distro-sync

CentOS 8 system upgrade

Install a new kernel for CentOS 8

To install a new kernel for CentOS 8, run the command.

[root@localhost www.linuxidc.com] # dnf-y install kernel-core

Install the kernel in CentOS 8

Finally, install the CentOS 8 minimum package.

[root@localhost www.linuxidc.com] # dnf-y groupupdate "Core"Minimal Install"

Now you can check the installed version of CentOS by running the following command.

[root@localhost www.linuxidc.com] # cat / etc/RedHat-release above is the content of this article on "how to quickly upgrade from CentOS7 to CentOS8". I believe you all have some understanding. I hope the content shared by the editor will be helpful to you. If you want to learn more about related knowledge, please follow the industry information channel.

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