How to Upgrade CentOS 7 to CentOS 8

In this article, you will learn how to upgrade CentOS 7 to CentOS 8. The steps described herein do not depict the official upgrade and this should not be applied to a production server yet.

Step 1: Install the EPEL Repository

To start off, install the EPL repository by running:

# yum install epel-release -y
Install EPEL Repo in CentOS 7

Install EPEL Repo in CentOS 7

Step 2: Install yum-utils Tools

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

# yum install yum-utils
Install yum-utils in CentOS 7

Install yum-utils in CentOS 7

Thereafter, you need to resolves RPM packages by executing the command.

# yum install rpmconf
# rpmconf -a
Keep Default RPM Settings

Keep Default RPM Settings

Next, perform a clean-up of all the packages you don’t require.

# package-cleanup --leaves
# package-cleanup --orphans
Clean RPM Packages

Clean RPM Packages

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
Install dnf in CentOS 7

Install dnf in CentOS 7

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

# dnf -y remove yum yum-metadata-parser
# rm -Rf /etc/yum
Remove Yum in CentOS 7

Remove Yum in CentOS 7

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.

# dnf upgrade
Upgrade CentOS 7

Upgrade CentOS 7

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

dnf -y upgrade
Install CentOS 8 Release

Install CentOS 8 Release

Next, upgrade the EPEL repository.

dnf -y upgrade
Upgrade EPEL Repository

Upgrade EPEL Repository

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
CentOS 8 System Upgrade

CentOS 8 System Upgrade

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
Install Kernel in CentOS 8

Install Kernel in CentOS 8

Finally, install CentOS 8 minimal package.

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

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

# cat /etc/redhat-release
Check CentOS Version

Check CentOS Version

Read Also: How to Set Up Automatic Updates for CentOS 8


This article concludes on how you can upgrade from CentOS 7 to CentOS 8. We hope you found this insightful.

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47 Responses

  1. Kulatamicuda says:

    Need to use dnf -y upgrade as 8.1 is out.

  2. Alex says:

    Please help:

    dnf upgrade shows this error:

    Error: Transaction check error:
    file /usr/lib64/ from install of gdbm-libs-1:1.18-1.el8.x86_64 conflicts with file from package gdbm-1.10-8.el7.x86_64

    Thanks! ASAP.

  3. Paul I Lin says:

    So I completed your guide to upgrading CentOS 7 to 8 after fixing the issue I mentioned earlier. But after I rebooted, I only see the CentOS 7 boot loader and none of the boot loaders can boot because CentOS 7 is gone. I can still boot into rescue mode – is there a way to edit the boot screen to pick up the new CentOS 8 boot loader?

  4. sh says:

    Total mess – Do not do it

    I just stuck in it. nor you can update with DNF or any way to reinstall yum again.!!!

    can not run any program like this:
    /usr/sbin/squid: symbol lookup error: /usr/sbin/squid: undefined symbol: _ZN7libecap4NameC1ERKNSt7__cxx1112basi...IcESaIcEE

    Last metadata expiration check: 0:11:25 ago on Thu 26 Dec 2019 07:49:40 PM +0330.
    Problem: package python3-dnf- requires dnf-data =, but none of the providers can be installed
    – package dnf- requires python3-dnf =, but none of the providers can be installed
    – cannot install both dnf-data- and dnf-data-
    – package yum- requires dnf =, but none of the providers can be installed
    – package python2-dnf- requires dnf-data =, but none of the providers can be installed
    – conflicting requests
    – problem with installed package python2-dnf-
    (try to add ‘–allowerasing’ to command line to replace conflicting packages or ‘–skip-broken’ to skip uninstallable packages)

  5. bob says:

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

    Running transaction check
    Error: transaction check vs depsolve:
    (annobin if gcc) is needed by redhat-rpm-config-116-1.el8.0.1.noarch
    rpmlib(RichDependencies) <= 4.12.0-1 is needed by redhat-rpm-config-116-1.el8.0.1.noarch
    To diagnose the problem, try running: 'rpm -Va –nofiles –nodigest'.
    You probably have corrupted RPMDB, running 'rpm –rebuilddb' might fix the issue.
    The downloaded packages were saved in cache until the next successful transaction.
    You can remove cached packages by executing 'dnf clean packages'.

  6. GregM says:

    I hand to reinstall CentOS 7 from scratch. I run Mate Desktop. Mate is not compatible with CentOS 8 at this time.

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