The relationship and difference between CentOS and RedHat

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Introduction to the CentOS release
CentOS is Community Enterprise Operating system abbreviation, we have a lot of people call it Community enterprise operating system, no matter what you call it, it is a distribution version of Linux. Official website: [Url]http://www.centos.org[/url]

RedHat Release Introduction
Red Hat's products, including RedHat Linux (such as RedHat 7,8,9) and enterprise-issued versions of Red Hat Enterprise Linux, are available and available free of charge via web FTP, but in 2003, Red H At Linux discontinued development, which is why there is no Redhat 10, and its project is replaced by the Fedora Project, which is released under the name Fedora Core and provides free access for ordinary users. Official website: [Url]http://www.redhat.com[/url]

　 relationship between the two
Linux is an open source system, as we all know. Red Hat is the world's most famous Linux system development company, and most of the packages in its Linux distribution are based on the GPL, which is what we often call open source software, and because of this, Red Hat also has to follow this agreement, which will form Red Hat En Terprise Linux (hereinafter referred to as RHEL) software packages of the source of the public release, as long as it is in accordance with the GPL agreement, anyone can build on the original software on the basis of re-development and release. So a project called Community Enterprise Operating System was born. His initials are both CentOS. The CentOS community downloads all the source code obtained on RedHat's website and compiles it. After recompiling, some bugs were fixed, since RHEL is a commercial product, all RedHat logos and logos must be changed to their own CentOS logo. CentOS is the free version of RedHat. With CentOS, you get the same performance and feel as RHEL. Prima, Plesk, Virtuozzo and both can be installed on the CentOS.

This is how CentOS clones a Linux distribution that is reproduced on the basis of RHEL release. The clone version of Rhel is not only centos one, but also white box Enterprise Linux and TAO Linux and Scientific Linux, and CentOS is outstanding and excellent in many of the clone versions of Rhel. Why does Red Hat tolerate this behavior of CentOS? According to the GPL, CentOS is perfectly legal, and Red Hat has no alternative, and its business is based on the open source model. But CentOS does continue to devour the Red Hat market, which is also observed on Google trends. From the current situation, the damage done by CentOS has not yet reached the point where Red Hat has to change the business model. The advantage is that it forces Red Hat to innovate faster, always ahead of other Linux server distributions. The real victims of CentOS's great success are other distributions, such as Novell's SLEs, Ubuntu server and so on. RedHat's attitude to this distribution is: "We are not really against this distribution, the users who really pay us, they value not the system itself, but the business services we provide." ”

　　 difference between the two

RHEL can receive online upgrades (including patches) or consulting services, technical support through payment, CentOS provides long-term free upgrade update support, and there are many technical support on the network. Although it is the clone version of Rhel, but not exactly the same, does not guarantee that the corresponding Rhel software on CentOS can also be enough to 100% of normal work. and security bug fixes and package upgrades correspond to the paid service and technical support of RHEL, and there are delays for several hours, a few days a few weeks, and a few months of slow. So, CentOS can get all the features of RHEL, even better software. However, CentOS does not provide commercial support to users and, of course, is not responsible for any business. Using CentOS is completely legal and does not involve copyright issues. CentOS is easy to obtain, with more than 10 site mirrors (HTTP/FTP) available worldwide, as well as BT mode (seed is available all year round).

　 version corresponding
CentOS 5.0 = RedHat AS5
CentOS 5.1 = RedHat as5-update1
CentOS 5.2 = RedHat As5-update2
CentOS 5.3 = RedHat as5-update3
CentOS 5.4 = RedHat as5-update4
CentOS 5.5 = RedHat as5-update5

　　 How to choose

With CentOS, you get the same performance and feel as as/es. Many companies are gradually transferring rhel to CentOS because they do not want to pay for Rhel upgrades. Of course, this is because these companies have many years of experience with UNIX, so RHEL's commercial technical support is not important to them. But if you are a purely business-oriented enterprise, then I suggest you buy the RHEL software and purchase the corresponding services. This will save you money on IT management and get professional services. In a word, the choice of CentOS or RHEL depends on whether your company has the appropriate technical force.

The relationship and difference between CentOS and RedHat