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CentOS
GNOME Shell desktop in CentOS 8
DeveloperThe CentOS Project
(affiliated with Red Hat)
OS familyLinux (Unix-like)
Working stateCurrent
Source modelOpen source
Initial release14 May 2004; 20 years ago (2004-05-14)[1]
Latest release
  • 8.5.2111[2] (16 November 2021; 3 years ago (2021-11-16)) [±]
  • 7.9-2009[3] (12 November 2020; 4 years ago (2020-11-12)) [±]
Marketing targetservers, desktop computers, workstations
Update methodLong-term support
Package managerYum (command line); PackageKit (graphical); .rpm (binaries format)
Platformsx86-64[a], and since CentOS 8, POWER8 and 64-bit ARM
Kernel typeMonolithic (Linux kernel)
Default
user interface		Bash (Unix shell), GNOME Shell[4]
LicenseGNU GPL and other licenses
Official websitecentos.org

CentOS (/ˈsɛntɒs/, from Community Enterprise Operating System[5][6]) is a Linux distribution that provides a free, community-supported computing platform functionally compatible with its upstream source, Red Hat Enterprise Linux (RHEL).[7][8] In January 2014, CentOS announced the official joining with Red Hat while staying independent from RHEL,[9] under a new CentOS governing board.[10][11]

The first CentOS release in May 2004, numbered as CentOS version 2, was forked from RHEL version 2.1AS.[1] CentOS version 7.0 officially supports only the x86-64 architecture, while versions older than 7.0-1406 also support IA-32 with Physical Address Extension (PAE). As of December 2015, AltArch releases of CentOS 7 are available for the IA-32 architecture, Power ISA, and for the ARMv7hl and AArch64 variants of the ARM architecture.[12][13] Building of CentOS 8 started at May 2019.[14][15][16] CentOS 8 was released on 24 September 2019.

History

Prior to becoming known under its current name, CentOS originated as a build artifact of CAOS Linux,[17] which was started by Gregory Kurtzer.[18]

In June 2006, David Parsley, the primary developer of Tao Linux (another RHEL clone), announced the retirement of Tao Linux and its rolling into CentOS development. Tao users migrated to the CentOS release via yum update.[19]

In July 2009, it was reported in an open letter on the CentOS project web site that CentOS's founder, Lance Davis, had disappeared in 2008. Davis had ceased contribution to the project, but continued to hold the registration for the CentOS domain and PayPal account. In August 2009, the CentOS team reportedly made contact with Davis and obtained the centos.info and centos.org domains.[20]

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.[21] Debian retook the lead in January 2012.[22]

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".[23] As a result of these changes, ownership of CentOS trademarks was transferred to Red Hat,[24] which now employs most of the CentOS head developers; however, they work as part of Red Hat's Open Source and Standards team, which operates separately from the Red Hat Enterprise Linux team.[9] A new CentOS governing board was also established.[10]

Design

RHEL is available only through a paid subscription service or for development use in a non-production environment[25] – which provides access to software updates and varying levels of technical support. The product is largely composed of software packages distributed under free software licenses and the source code for these packages is made public by Red Hat.

CentOS developers use Red Hat's source code to create a final product very similar to RHEL. Red Hat's branding and logos are changed because Red Hat does not allow them to be redistributed.[26] CentOS is available free of charge. Technical support is primarily provided by the community via official mailing lists, web forums, and chat rooms.

The project is affiliated with Red Hat but aspires to be more public, open, and inclusive. While Red Hat employs most of the CentOS head developers, the CentOS project itself relies on donations from users and organizational sponsors.[9]

Versioning and releases

CentOS releases

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.[27]

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. For example, version number 7.0-1406 still maps this CentOS release to the zeroth update set of RHEL 7, while "1406" indicates that the source code this release is based on dates from June 2014. Using the monthstamp allows installation images to be reissued for (as of July 2014) oncoming container and cloud releases, while maintaining a connection to the related base release version.[28]

Since mid-2006 and starting with RHEL version 4.4, which is formally known as Red Hat Enterprise Linux 4.0 update 4, Red Hat has adopted a version-naming convention identical to that used by CentOS (for example, RHEL 4.5 or RHEL 6.5).[29]

On 10 September 2019 CentOS deferred CentOS 8 work for CentOS 7.7 since CentOS 7.x was in production and CentOS 8.x was not in production. Once CentOS 7.7 was released resources moved back to CentOS 8.0 which was released on 24 September 2019.

On 24 September 2019 CentOS officially released CentOS version 8.0.

Older version information

Latest version information

CentOS version 7
CentOS version Architectures RHEL base Kernel CentOS release date RHEL release date Delay (days)
7.0-1406[104][105] x86-64[106][b] 7.0 3.10.0-123 7 July 2014[28] 10 June 2014[107] 27
7.1-1503 x86-64 7.1 3.10.0-229 31 March 2015[108][109] 5 March 2015[110] 26
7.2-1511[111] x86-64 7.2 3.10.0-327 14 December 2015[112][113] 19 November 2015[114] 25
7.3-1611 x86-64 7.3 3.10.0-514 12 December 2016[115] 3 November 2016[116] 39
7.4-1708 x86-64 7.4 3.10.0-693 13 September 2017[117] 31 July 2017[118]

[97]

43
7.5-1804 x86-64 7.5 3.10.0-862 10 May 2018[119] 10 April 2018[120]

[97]

31
7.6-1810 x86-64 7.6 3.10.0-957 3 December 2018[121] 30 October 2018[122]

[97]

34
7.7-1908 x86-64 7.7 3.10.0-1062 17 September 2019[123] 6 August 2019[124]

[97]

42
CentOS version 8
CentOS version Architectures RHEL base Kernel CentOS release date RHEL release date Delay (days)
8.0-1905 x86-64, POWER8 (le), AArch64 8.0 4.18.0-80 24 September 2019[125] 7 May 2019[126][97] 140

AltArch releases

AltArch releases are released by the Alternative Architecture Special Interest Group (AltArch SIG) to support architectures that are not supported by the base CentOS releases.

CentOS version Architectures RHEL base CentOS release date
7.1-1503 AArch64 7.1 4 August 2015[13]
IA-32 12 October 2015[127]
7.2-1511 IA-32 7.2 19 December 2015[12]
ARMv7hl 19 December 2015[12]
PowerPC64 (TechPreview) 19 December 2015[12]
POWER8 (le) (TechPreview) 19 December 2015[12]
7.3-1611 ARMv7hl 7.3 14 December 2016
POWER8 (le) 22 December 2016
AArch64 4 January 2017
IA-32 27 January 2017
7.4-1708 ARMv7hl 7.4 13 September 2017[128]
POWER8 (le) 14 September 2017[129]
POWER7 14 September 2017[130]
AArch64 13 September 2017[131]
IA-32 12 October 2017[132]
7.5-1804 ARMv7hl 7.5 10 May 2018[133]
POWER8 LE 10 May 2018[119]
POWER7 10 May 2018[119]
AArch64 10 May 2018[119]
IA-32 10 May 2018[119]
7.6-1810 ARMv7hl 7.6 3 December 2018[134]
POWER8 (le) 3 December 2018[135]
PowerPC9 3 December 2018[135]
AArch64 3 December 2018[135]
IA-32 3 December 2018[135]
7.7-1908 ARMv7hl 7.7 17 September 2019[136]
POWER7 17 September 2019[136]
POWER8 (le) 17 September 2019[136]
POWER9 17 September 2019[136]
AArch64 17 September 2019[136]
IA-32 17 September 2019[136]

Add-ons releases

Software Collections (SCL) is a CentOS repository that provides a set of dynamic programming languages, database servers, and various related packages. Provided software versions are either more recent than their equivalent versions included in the base CentOS distribution, or are made available as official CentOS packages for the first time.[137] (See also the list of CentOS repositories below.)

Packages available from the SCL do not replace the default system tools provided with CentOS. Instead, a parallel set of tools is installed in the /opt directory, and can be optionally enabled per application by using supplied scl utility. For example, the default versions of Perl or MySQL remain those provided by the base CentOS installation.[137]

Add-on name Architectures Base CentOS version CentOS release date RHEL release date Delay (days)
Software Collections (SCL) 1.0[138] x86-64 6.4, 6.5[139] 19 February 2014[139] 12 September 2013[138] 160
Developer Toolset 2.0[140] IA-32, x86-64 6.4 —[141] 12 September 2013[140] —

End-of-support schedule

According to the Red Hat Enterprise Linux (RHEL) life cycle,[142] CentOS 5, 6 and 7 will be "maintained for up to 10 years" as it is based on RHEL.[143] Previously, CentOS 4 had been supported for seven years.[144]

CentOS
version 		Release
date 		Full
updates[145][146] 		Maintenance
updates[145][146]
Old version, no longer maintained: 3 19 March 2004 20 July 2006 31 October 2010
Old version, no longer maintained: 4 9 March 2005 31 March 2009 29 February 2012[147]
Old version, no longer maintained: 5 12 April 2007 31 January 2014 31 March 2017[148]
Old version, yet still maintained: 6 10 July 2011 10 May 2017 30 November 2020
Old version, yet still maintained: 7 7 July 2014 6 August 2020 30 June 2024
Current stable version: 8 24 September 2019 1 May 2024 31 May 2029
Legend:
Old version, not maintained
Old version, still maintained
Latest version
Latest preview version
Future release

Releases without upstream equivalents

Some of the ISO images released by the CentOS project have no direct upstream equivalents. They are created for specific purposes, such as for providing a live bootable image, or for providing a reduced-size installation medium. In addition to those listed below, there are also AltArch releases, which also have no direct upstream equivalents.

LiveCD and LiveDVD images contain a bootable compressed file system, created by a set of custom scripts[149] using a kickstart configuration file.[150] These live images can be also installed to hard disk, thus obtaining a fully functional CentOS installation. The set of packages installed that way on a hard disk can not be adjusted during the installation, as that is a simple transfer of the image existing on CD/DVD, to a hard disk. After booting from hard disk, yum can be used for adding or removing packages.[151]

MinimalCD images contain a minimum of packages required for a functional installation, with no compromises in security or network usability. These minimal images use the standard CentOS installer with all of its regular features minus the selection of packages. Yum can be used after the installation is completed to add or remove packages.[152][153]

Special interest groups

Special interest groups (SIGs) are organized portions of the CentOS community that open paths for building specialized variants of CentOS, which fulfill specific sets of requirements. SIGs have the freedom to modify and enhance CentOS in various ways, including adding more cutting-edge software, rebuilding existing packages depending on the requirements, providing alternative desktop environments, or making CentOS available on otherwise unsupported architectures.[174]

Architectures

As of version 8, CentOS fully supports x86-64, POWER8 and 64-bit ARM architectures,[175] while the following architectures are not supported:

As of December 2015, AltArch releases of CentOS 7 are available for the ARMv7hl and AArch64 variants of the ARM architecture,[13] and plans exist for supporting other variants of the ARM architecture. ARM support is a community effort coordinated through the AltArch SIG.[13][176] AltArch releases of CentOS 7 are also available for the IA-32 architecture and Power ISA (POWER7 and POWER8 chips).[12]

A Live CD version of CentOS is available at mirror.centos.org. A bootable Live USB image of CentOS can be created manually or with UNetbootin.

CentOS images are also available on Amazon's EC2 cloud, in form of prebuilt and already published Amazon Machine Images (AMIs).[177][178]

Repositories

There are three primary CentOS repositories (also known as channels), containing software packages that make up the main CentOS distribution:[179]

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. Bugfix and enhancement updates released this way are only those unsuitable to be released through the CentOS-Fasttrack repository described below.[180][181]
addons
provides packages required for building the packages that make up the main CentOS distribution, but are not provided by the upstream.[c]

The CentOS project provides several additional repositories that contain software packages not provided by the default base and updates repositories. Those repositories include the following:[182]

CentOS Extras
contains packages that provide additional functionality to CentOS without breaking its upstream compatibility or updating the base components.
CentOSPlus
contains packages that actually upgrade certain base CentOS components, changing CentOS so that it is not exactly like the upstream provider's content.
CentOS-Testing
serves as a proving ground for packages on their way to CentOSPlus and CentOS Extras. Offered packages may or may not replace core CentOS packages, and are not guaranteed to work properly.
CentOS-Fasttrack
contains bugfix and enhancement updates issued from time to time, between the regular update sets for point releases. The packages released this way serve as close candidates for the inclusion into the next point release. This repository does not provide security updates, and does not contain packages unsuitable for uncertain inclusion into point releases.[180][181][183]
CR (Continuous Release)
makes generally available packages that will appear in the next point release of CentOS. The packages are made available on a testing and hotfix basis, until the actual point release is formally released in form of ISO images.[184]
debuginfo
Contains packages with debugging symbols generated when the primary packages were built.
contrib
Contains packages contributed by CentOS users that do not overlap with any of the core distribution packages.
Software Collections
Provides versions of software newer than those provided by the base distribution, see above for more details.

Notes

  1. ^ CentOS versions older than 7.0-1406 had officially support for i686 with Physical Address Extension (PAE), additional architectures were supported in the versions older than 4.7, and currently are provided by AltArch Special Interest Group
  2. ^ Installation images for i386, ARM and PowerPC are provided by AltArch Special Interest Group.
  3. ^ This repository does not exist from CentOS 6.

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Further reading

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