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Check Information

Use the check version CentOS uname-A or cat/etc/redhat-release command

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Step 1 Install the EPEL repository

Yum Install Epel-Release-y
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Install Yum-utils

Install Yum install yum-utils

Install the rpmconf configuration RPM Package

# yum Install rpmconf
# rpmconf-A 
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Run the command rpmconf-A-> select N means Update the nsswitch. conf file to keep the current version

Next step we clean

# Package-cleanup--Leaves
 # Package-cleanup--orphans 
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Step 3: Install DNF Centos 7

Yum install DNF

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Remove Management Packs with the command

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

Step 4: Upgrade Centos 7 to Centos 8

with DNF Upgrade not using yum command

# DNF Upgrade
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Steps to install CentOS 8 packages using DNF command

DNF-y Upgrade

Update EPEL Repo

DNF-y Upgrade
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After the update is complete we clear DNF

DNF Clean All

Delete always old kernel Centos 7

RPM-E 'rpm-Q kernel'

Always delete conflicting packages if available

# RPM-E--nodeps sysvinit-Tools

Launch Run Cenots 8

# DNF-y--releasever = 8--allowerasing--setopt = deltarpm = False distro-sync
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Step 5: Install new Kernel OS Centos 8

# DNF-y install kernel-core

Set the core.

DNF-y groupupdate "Core" "Minimal Install"

Check version for Success

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I Wish you success

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