How To Check CentOS Version

The purpose of this tutorial is to show how to check the CentOS version of your Linux system. It’s possible to do this from either command line or GUI, so you can use whichever method is more convenient for you. Classic CentOS is nearing its end of life and will be replaced by CentOS Stream. Knowing your CentOS version will give you some insight into how long your system will continue to be supported. In this tutorial you will learn:

• How to view CentOS version via GUI
• How to view CentOS version via command line

Software Requirements and Linux Command Line Conventions

Category	Requirements, Conventions or Software Version Used
System	CentOS Linux
Software	N/A
Other	Privileged access to your Linux system as root or via the sudo command.
Conventions	# – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command $ – requires given linux commands to be executed as a regular non-privileged user

How to check CentOS version step by step instructions

TIME TO SWITCH TO CENTOS STREAM? End of life dates will be coming for CentOS 7 and CentOS 8 in 2024. As a CentOS administrator, it is time to start considering whether you want to migrate to CentOS Stream or hop to a new distro very soon.

There are several ways on how to check what version of CentOS is running on your system. The simplest way to check for the CentOS version number is to execute the cat /etc/centos-release command. Identifying the accurate CentOS version may be required to help you or your support team to troubleshoot your CentOS system.

The CentOS version consists of three release versions as illustrated below:

To check a version of other Linux distributions visit our how to check Linux version guide.

End of Lifetime (EOL) Dates

The following table represents the official “End of Lifetime” dates for the CentOS operating system.

What is the command to check CentOS version?

The following table contains most common and recommended ways on how to check CentOS version on your CentOS Linux server or desktop.

Command	Description
$ rpm -q centos-linux-release $ rpm -q centos-release	CentOS version valid for CentOS 6 and higher. Causes to reveal major, minor and asynchronous CentOS version.
$ lsb_release -d	Requires redhat-lsb package to be installed before execution.
$ rpm -E %{rhel}	RPM macro to reveal a major CentOS version
$ rpm –eval %{centos_ver}	RPM macro to display a major version of CentOS
$ cat /etc/centos-release	Linux cat command to output content of the /etc/centos-release to query CentOS version. Works with CentOS 6 and higher.

Alternative commands to check CentOS version

In case the above-provided commands did not help you to obtain the CentOS version number you may try the following alternative commands.

Although available only for CentOS version 7 and above the hostnamectl command might provide you with a significant clue about your OS version number:

$ hostnamectl   Static hostname: linuxconfig         Icon name: computer-vm           Chassis: vm        Machine ID: 15e085b3b0804a88b04a63b0012f544d           Boot ID: 581516a48bb04b8c837d98163ffbcfaf    Virtualization: oracle  Operating System: CentOS Linux 8       CPE OS Name: cpe:/o:centos:centos:8            Kernel: Linux 4.18.0-305.10.2.el8_4.x86_64     Architecture: x86-64

For more answers try to query all release files within the /etc directory:

$ cat /etc/*elease CentOS Linux release 8.4.2105 NAME="CentOS Linux" VERSION="8" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="8" PLATFORM_ID="platform:el8" PRETTY_NAME="CentOS Linux 8" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:8" HOME_URL="https://centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-8" CENTOS_MANTISBT_PROJECT_VERSION="8" CentOS Linux release 8.4.2105

The system you are running may have macros defined which can help you in identifying the major release version of your CentOS Linux server. Try the following:

$ rpm --eval '%{centos_ver}' 8

Lastly, your GRUB boot menu may provide some answers. Checking CentOS version from GRUB mane is not the most reliable way, however it may provide you with some clues:

# grep title /boot/loader/entries/* /boot/loader/entries/15e085b3b0804a88b04a63b0012f544d-0-rescue.conf:title CentOS (0-rescue-15e085b3b0804a88b04a63b0012f544d) 8 /boot/loader/entries/15e085b3b0804a88b04a63b0012f544d-4.18.0-305.10.2.el8_4.x86_64.conf:title CentOS (4.18.0-305.10.2.el8_4.x86_64) 8

Using Programming to check CentOS version

In case you wish to program your way to check the CentOS version automatically you have multiple options available. This section will list some basic examples of how to check CentOS version using Bash script and Python programming language.

Bash Scripting

Using bash scripting, the following script can be used to obtain the CentOS version number given that the /etc/centos-release file exists and is populated. The below script serves as an example, feel free to modify wherever appropriate. For more information about Bash Scripting visit our bash scripting tutorial:

#!/bin/bash full=`cat /etc/centos-release | tr -dc '0-9.'` major=$(cat /etc/centos-release | tr -dc '0-9.'|cut -d . -f1) minor=$(cat /etc/centos-release | tr -dc '0-9.'|cut -d . -f2) asynchronous=$(cat /etc/centos-release | tr -dc '0-9.'|cut -d . -f3) echo CentOS Version: $full echo Major Relase: $major echo Minor Relase: $minor echo Asynchronous Relase: $asynchronous

Output:

$ ./check-centos-version.sh CentOS Version: 8.4.2105 Major Relase: 8 Minor Relase: 4 Asynchronous Relase: 2105

Python programming

The following python script will output the distribution name along with the OS version number. Note make sure that you have the python3-distro package installed on your system before you try to check the CentOS version with python:

#!/usr/bin/python3 import distro print(distro.linux_distribution())

Alternatively, one can execute python code directly from the shell:

$ python3 -c 'import distro; print(distro.linux_distribution())'

Output:

$ ./check-centos-version.py ('CentOS Linux', '8', 'n/a')

Closing Thoughts

In this tutorial, we saw various ways to check the current version of a CentOS Linux system. Whether you are on an older version of CentOS, or using CentOS Stream, it is important to know the version of your system and keep up with current updates. If updating to CentOS Stream does not grant you the reliability you are used to, check out other Red Hat clones such as AlmaLinux and Rocky Linux.

Related Posts:

• Linux Commands Tutorial
• Installing and using Gentoo Linux: Getting Started…
• VIM tutorial for beginners
• Choosing the right Linux File System Layout using a…
• Things to install on Ubuntu 20.04
• mount-(8) manual page