The document provides information about the members of a presentation group and details about the CentOS operating system. It introduces three group members and their student IDs and batches. It then discusses what CentOS is, provides a brief history of CentOS, describes the architectures and kernels supported, bootable media versions, goals, repositories, and end-of-support schedule for different CentOS versions.

1. OUR Presentation GROUP MEMBERS
Name ID Batch
Saiful Islam 2013100000024 34
Mahmudul Hasan 2013100000042 34
Sultana Razia Mim 2014100000032 37

2. CentOS Operating
System

4. CONTENTS
 What is CentOS?
 Brief History about CentOS.
 Architecture of CentOS.
 Types of Kernels are available with CentOS.
 CentOS Bootable Media Version.
 Goals of CentOS.
 Repositories of CentOS.
 End-of-support schedule

5. What is CentOS?
 CentOS is a community-supported, mainly free software
operating system based on Red Hat Enterprise Linux. It
exists to provide a free enterprise class computing platform
and strives to maintain 100% binary compatibility with its
upstream distribution. Centos stands for Community
Enterprise Operating System.

6. HISTORY OF CentOS
 Prior to becoming known under its current name, CentOS
originated as a build artifact of cAos Linux. At the time, some
of the cAos contributors were merely interested in this build
artifact for their own use, citing difficulties in collaborating with
other noteworthy Red Hat Enterprise Linux (RHEL) clones of
the time.
 In June 2006, David Parsley, the primary developer of Tao
Linux, announced the retirement of Tao Linux and its rolling
into CentOS development.

7. HISTORY OF CentOS
 In July 2010, CentOS overtook Debian to become the most
popular Linux distribution for web servers, with almost 30% of
all Linux web servers using it. Debian retook the lead in
January 2012.
 In January 2014, Red Hat announced that it would sponsor
the CentOS project, "helping to establish a platform well-
suited to the needs of open source developers that integrate
technologies in and around the operating system".As a result
of these changes, ownership of CentOS trademarks was
transferred to Red Hat.

8. What architectures does Centos
Support?
 Centos 2 works with x86 only.
 Centos 3 works with x86, x86_64 (AMD64 and Intel EM64T),
s390, s390x, ia64 (Intel Itanium2).
 Centos 4 works with x86, x86_64, s390, s390x and ia64. pap
(PowerPC), alpha (DEC Alpha) and spark are released in
beta for Centos 4.
 Centos 5 works with x86 and x86_64. ia64, pap (PowerPC)
and spark are being developed.

9. What kernels are available
with Centos?
 kernel: Normal kernel that supports both UP and SMP
machines.
 kernel-PAE: Only x86 CPUs that work with Physical
Address Extensions can run this kernel.
 kernel-oxen: Linux kernel compiled with PAE support works
on the Oxen hyper visor, for both privileged (dom0) and
unprivileged (dome) domains.

10. Bootable Media Version OF
CentOS
 A Live CD version of CentOS is available at
mirror.centos.org.
 A Live USB of CentOS can be created manually or with
UNetbootin.

11. GOALS OF Centos OPERATING
SYSTEM
• Creating solutions that are easily maintained.
• Usable for the long-term in production environments.
• A user and package maintainer friendly environment.
• Supporting the core for the long-term.
• Actively working toward the development of additional solutions.
• A strong community infrastructure.
• An open management policy.
• An open business model.
• Commercial support through its partner vendors, like Vault Networks.

12. VERSIONING OF CentOS Operating
System
 CentOS version numbers for releases older than 7.0 have two
parts, a major version and a minor version, which correspond
to the major version and update set of Red Hat Enterprise
Linux (RHEL) used to build a particular CentOS release. For
example, CentOS 6.5 is built from the source packages of
RHEL 6 update 5 (also known as RHEL version 6.5), which is
a so-called "point release" of RHEL 6.
 Starting with version 7.0, CentOS version numbers also
include a third part that indicates the monthstamp of the
source code the release is based on.

13. How to Check CentOS Version
Number?
 The easiest way to check your CentOS version is via the
command line. Login to your CentOS server using SSH and run
the following command
cat /etc/centos-release
 This should return the following CentOS version information :
CentOS release 6.2 (Final)

14. A Video REVIEW OF CentOS 7.2

15. REPOSITORIES OF CentOS Operating
System
There are three primary CentOS repositories. Containing software
packages that make up the main CentOS distribution :
 Base – contains packages that form CentOS point releases, and gets
updated when the actual point release is formally made available in form
of ISO images.
 Updates – contains packages that serve as security, bugfix or
enhancement updates, issued between the regular update sets for point
releases.
 Addons – provides packages required for building the packages that
make up the main CentOS distribution, but are not provided by the
upstream.

16. End-of-support schedule
 According to the Red Hat Enterprise Linux (RHEL) life cycle, CentOS 5, 6
and 7 will be "maintained for up to 10 years" as it is based on RHEL.
Previously, CentOS 4 had been supported for seven years.
CentOS Version Release Date Full Updates Maintenens
Updates
3 19 March 2004 20 July 2006 31 October 2010
4 9 March 2005 31 March 2009 29 February 2012
5 12 April 2007 31 January 2014 31 March 2017
6 10 July 2011 10 May 2017 30 November 2020
7 7 July 2014 Q4 2020 30 June 2024
Old version Older version Still Supported Latest version

17. THANK YOU