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Introduction
In this tutorial guide You will learn how to upgrade your Linux server from CentOS 7 to CentOS 8.
Just follow these steps:
Install the EPEL Repository
You need to install the EPL repository with the following command:
[root@unixcop ~]# yum install epel-release -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirror.ndchost.com
* epel: mirror.prgmr.com
* extras: mirrors.raystedman.org
* updates: mirror.sjc02.svwh.net
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-11 will be updated
---> Package epel-release.noarch 0:7-13 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Updating:
epel-release noarch 7-13 epel 15 k
Transaction Summary
======================================================================================================================================================
Upgrade 1 Package
Total download size: 15 k
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
warning: /var/cache/yum/x86_64/7/epel/packages/epel-release-7-13.noarch.rpm: Header V4 RSA/SHA256 Signature, key ID 352c64e5: NOKEY
Public key for epel-release-7-13.noarch.rpm is not installed
epel-release-7-13.noarch.rpm | 15 kB 00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Importing GPG key 0x352C64E5:
Userid : "Fedora EPEL (7) <[email protected]>"
Fingerprint: 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5
Package : epel-release-7-11.noarch (@extras)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Updating : epel-release-7-13.noarch 1/2
Cleanup : epel-release-7-11.noarch 2/2
Verifying : epel-release-7-13.noarch 1/2
Verifying : epel-release-7-11.noarch 2/2
Updated:
epel-release.noarch 0:7-13
Complete!
[root@unixcop ~]#Install yum-utils Tools
So Install yum-utils with command:
[root@unixcop ~]# yum install yum-utils -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.san.fastserv.com
* epel: mirror.sfo12.us.leaseweb.net
* extras: mirrors.raystedman.org
* updates: mirror.sjc02.svwh.net
Resolving Dependencies
--> Running transaction check
---> Package yum-utils.noarch 0:1.1.31-54.el7_8 will be installed
--> Processing Dependency: python-kitchen for package: yum-utils-1.1.31-54.el7_8.noarch
--> Processing Dependency: libxml2-python for package: yum-utils-1.1.31-54.el7_8.noarch
--> Running transaction check
---> Package libxml2-python.x86_64 0:2.9.1-6.el7.5 will be installed
---> Package python-kitchen.noarch 0:1.1.1-5.el7 will be installed
--> Processing Dependency: python-chardet for package: python-kitchen-1.1.1-5.el7.noarch
--> Running transaction check
---> Package python-chardet.noarch 0:2.2.1-3.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Installing:
yum-utils noarch 1.1.31-54.el7_8 base 122 k
Installing for dependencies:
libxml2-python x86_64 2.9.1-6.el7.5 base 247 k
python-chardet noarch 2.2.1-3.el7 base 227 k
python-kitchen noarch 1.1.1-5.el7 base 267 k
Transaction Summary
======================================================================================================================================================
Install 1 Package (+3 Dependent packages)
Total download size: 863 k
Installed size: 4.3 M
Downloading packages:
(1/4): python-chardet-2.2.1-3.el7.noarch.rpm | 227 kB 00:00:00
(2/4): libxml2-python-2.9.1-6.el7.5.x86_64.rpm | 247 kB 00:00:00
(3/4): yum-utils-1.1.31-54.el7_8.noarch.rpm | 122 kB 00:00:00
(4/4): python-kitchen-1.1.1-5.el7.noarch.rpm | 267 kB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.1 MB/s | 863 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python-chardet-2.2.1-3.el7.noarch 1/4
Installing : python-kitchen-1.1.1-5.el7.noarch 2/4
Installing : libxml2-python-2.9.1-6.el7.5.x86_64 3/4
Installing : yum-utils-1.1.31-54.el7_8.noarch 4/4
Verifying : libxml2-python-2.9.1-6.el7.5.x86_64 1/4
Verifying : python-kitchen-1.1.1-5.el7.noarch 2/4
Verifying : yum-utils-1.1.31-54.el7_8.noarch 3/4
Verifying : python-chardet-2.2.1-3.el7.noarch 4/4
Installed:
yum-utils.noarch 0:1.1.31-54.el7_8
Dependency Installed:
libxml2-python.x86_64 0:2.9.1-6.el7.5 python-chardet.noarch 0:2.2.1-3.el7 python-kitchen.noarch 0:1.1.1-5.el7
Complete!
[root@unixcop ~]#You now need to resolve the RPM packages with commands below:
First install rpmconf
# yum install rpmconfThen resolve RPM packs with:
[root@unixcop ~]# rpmconf -a
Configuration file '/etc/nsswitch.conf'
-rw-r--r--. 1 root root 1938 Apr 28 09:31 /etc/nsswitch.conf.rpmnew
-rw-r--r--. 1 root root 1746 Aug 20 07:14 /etc/nsswitch.conf
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
M : merge configuration files
Z : background this process to examine the situation
S : skip this file
The default action is to keep your current version.
*** aliases (Y/I/N/O/D/M/Z/S) [default=N] ?
Your choice: N
[root@unixcop ~]#So The default action which N is to keep package maintainer’s version.
Next, perform a clean up of all the packages you don’t need with the following commands:
[root@unixcop ~]# package-cleanup --leaves
Loaded plugins: fastestmirror
bind-libs-lite-9.11.4-26.P2.el7_9.5.x86_64
libsysfs-2.1.0-16.el7.x86_64
[root@unixcop ~]# [root@unixcop ~]# package-cleanup --orphans
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirror.ndchost.com
* epel: mirror.sfo12.us.leaseweb.net
* extras: mirrors.raystedman.org
* updates: mirror.sjc02.svwh.net
kernel-3.10.0-957.el7.x86_64
[root@unixcop ~]#Install the dnf in CentOS 7
DNF is the default package manager in CentOS 8. Install it with command:
# yum install dnfNow remove the yum package manager with commands below:
[root@unixcop ~]# dnf remove yum yum-metadata-parser -y
Dependencies resolved.
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Removing:
yum noarch 3.4.3-168.el7.centos @System 5.6 M
yum-metadata-parser x86_64 1.1.4-10.el7 @System 57 k
Removing dependent packages:
yum-plugin-fastestmirror noarch 1.1.31-54.el7_8 @System 53 k
yum-utils noarch 1.1.31-54.el7_8 @System 337 k
Transaction Summary
======================================================================================================================================================
Remove 4 Packages
Freed space: 6.0 M
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Erasing : yum-utils-1.1.31-54.el7_8.noarch 1/4
Erasing : yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch 2/4
Erasing : yum-3.4.3-168.el7.centos.noarch 3/4
Erasing : yum-metadata-parser-1.1.4-10.el7.x86_64 4/4
Verifying : yum-3.4.3-168.el7.centos.noarch 1/4
Verifying : yum-metadata-parser-1.1.4-10.el7.x86_64 2/4
Verifying : yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch 3/4
Verifying : yum-utils-1.1.31-54.el7_8.noarch 4/4
Removed:
yum-3.4.3-168.el7.centos.noarch yum-metadata-parser-1.1.4-10.el7.x86_64 yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch
yum-utils-1.1.31-54.el7_8.noarch
Complete!
[root@unixcop ~]## rm -Rf /etc/yumUpgrade CentOS 7 to CentOS 8
Firstly, upgrade the dnf package manager with command:
# dnf upgradeThen install CentOS 8 release package using dnf with command below:
[root@unixcop ~]# dnf install http://mirror.centos.org/centos/8/BaseOS/x86_64/os/Packages/{centos-linux-repos-8-2.el8.noarch.rpm,centos-gpg-keys-8-2.el8.noarch.rpm,centos-linux-release-8.4-1.2105.el8.noarch.rpm} -y
Last metadata expiration check: 0:03:39 ago on Tue 24 Aug 2021 07:24:11 AM EDT.
centos-linux-repos-8-2.el8.noarch.rpm 72 kB/s | 20 kB 00:00
centos-gpg-keys-8-2.el8.noarch.rpm 68 kB/s | 12 kB 00:00
centos-linux-release-8.4-1.2105.el8.noarch.rpm 266 kB/s | 22 kB 00:00
Dependencies resolved.
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Installing:
centos-linux-repos noarch 8-2.el8 @commandline 20 k
centos-gpg-keys noarch 1:8-2.el8 @commandline 12 k
centos-linux-release noarch 8.4-1.2105.el8 @commandline 22 k
replacing centos-release.x86_64 7-9.2009.1.el7.centos
Transaction Summary
======================================================================================================================================================
Install 3 Packages
Total size: 53 k
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : centos-gpg-keys-1:8-2.el8.noarch 1/4
Installing : centos-linux-release-8.4-1.2105.el8.noarch 2/4
Installing : centos-linux-repos-8-2.el8.noarch 3/4
Obsoleting : centos-release-7-9.2009.1.el7.centos.x86_64 4/4
warning: file /etc/yum/vars/infra: remove failed: No such file or directory
warning: file /etc/yum/vars/contentdir: remove failed: No such file or directory
Verifying : centos-linux-repos-8-2.el8.noarch 1/4
Verifying : centos-gpg-keys-1:8-2.el8.noarch 2/4
Verifying : centos-linux-release-8.4-1.2105.el8.noarch 3/4
Verifying : centos-release-7-9.2009.1.el7.centos.x86_64 4/4
Installed:
centos-linux-repos-8-2.el8.noarch centos-gpg-keys-1:8-2.el8.noarch centos-linux-release-8.4-1.2105.el8.noarch
Complete!
[root@unixcop ~]#Next, upgrade the EPEL repository as follows:
[root@unixcop ~]# dnf upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm -y
Extra Packages for Enterprise Linux 7 - x86_64 14 MB/s | 17 MB 00:01
CentOS Linux 8 - BaseOS 7.2 MB/s | 5.6 MB 00:00
CentOS Linux 8 - AppStream 39 MB/s | 8.8 MB 00:00
CentOS Linux 8 - Extras 141 kB/s | 10 kB 00:00
epel-release-latest-8.noarch.rpm 60 kB/s | 23 kB 00:00
Dependencies resolved.
======================================================================================================================================================
Package Arch Version Repository Size
======================================================================================================================================================
Upgrading:
epel-release noarch 8-11.el8 @commandline 23 k
Transaction Summary
======================================================================================================================================================
Upgrade 1 Package
Total size: 23 k
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Upgrading : epel-release-8-11.el8.noarch 1/2
Cleanup : epel-release-7-13.noarch 2/2
Verifying : epel-release-8-11.el8.noarch 1/2
Verifying : epel-release-7-13.noarch 2/2
Upgraded:
epel-release-8-11.el8.noarch
Complete!
[root@unixcop ~]#Now, remove all the temporary files with the following command:
[root@unixcop ~]# dnf clean all
55 files removed
[root@unixcop ~]#Remove the old CentOS 7 kernel core with command:
# rpm -e `rpm -q kernel`Also you need to remove all conflicting packages with command below:
# rpm -e --nodeps sysvinit-toolsLaunch the CentOS 8 system upgrade as shown below:
[root@unixcop ~]# dnf --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync -y
Extra Packages for Enterprise Linux 8 - x86_64 8.2 MB/s | 10 MB 00:01
CentOS Linux 8 - BaseOS 7.2 MB/s | 5.6 MB 00:00
Extra Packages for Enterprise Linux Modular 8 - x86_64 5.1 MB/s | 931 kB 00:00
CentOS Linux 8 - AppStream 38 MB/s | 8.8 MB 00:00
CentOS Linux 8 - Extras 166 kB/s | 10 kB 00:00
Dependencies resolved.
.......
...Install the New Kernel Core for CentOS 8
To install a new kernel for CentOS 8, use this command below:
# dnf install kernel-core -yNOTE:
You may have some issues wit the command above that thers is a Problem: conflicting requests to the packages
So you can add this options to the command to solve this issue:
# dnf install kernel-core -y --allowerasing --skip-broken- The –allowerasing option to replace conflicting packages.
- The –skip-broken option to skip uninstallable packages.
Install CentOS 8 minimal packages
You are now ready to install CentOS 8 minimal package, You can do this with running below command:
# dnf groupupdate "Core" "Minimal Install" -yNOTE:
Also if you have the same problem above you can use this command to solve the issue:
# dnf groupupdate "Core" "Minimal Install" -y --allowerasing --skip-brokenSo the CentOS 7 to CentOS 8 upgrade task has been completed!
Now you can check the version of CentOS with :
[root@unixcop ~]# cat /etc/redhat-release
CentOS Linux release 8.4.2105
[root@unixcop ~]#Conclusion
So This article shows you how you can upgrade from CentOS 7 to CentOS 8.
Everything Linux, A.I, IT News, DataOps, Open Source and more delivered right to you.
"The best Linux newsletter on the web"
Thank you information. You might need to reinstall sysvinit-tools after upgrade…?
does not work in 2022