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This article shows you what the two major Linux product lines of Redhat in the CentOS system are, which are concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Linux is the abbreviation of GNU/Linux, which usually refers to the general name of various Linux distributions. The common Linux manufacturers are mainly Redhat/Novell and so on.

Redhat has two major Linux product lines, one of which is the free Fedora Core series, which is mainly used for desktop versions and provides support for more new features. Another product line is the paid Enterprise series, which is divided into: AS/ES/WS and other branches.

Advanced Server, abbreviated as AS. Based on the standard Linux kernel, AS enhances its performance, improves its reliability, and integrates many common server drivers. It can easily identify devices such as disk array cards of common rack servers such as IBM/DELL/HP.

2.x/3.x/4.x, the main version of AS, that is, what we call AS3/AS4, there are several upgrades for each version. For example, after the earliest launch of AS4, AS4 Update1 will be released when some updates are encountered, and later there will be AS4 Update2/Update3 and other versions referred to as AS4u1/AS4u2/AS4u3 and so on. This is also very similar to the release form of Microsoft, where Windows NT4 goes from SP1 to SP6,Windows2000, from SP1 to SP4.

AS these Update versions contain some differences in the major package versions, * do not mix it, otherwise it is easy to cause problems. The installation packages for Prima and Plesk are designed specifically for various distributions on the download page and are usually identified as which versions and which update systems are supported.

ES is a stripped-down version of AS. The difference between him and the common AS series is that AS supports more than 4-way CPU, while ES can only support two-way CPU. There is no difference between AS and ES in most packages, only in a few packages such as the kernel. There is a big difference between the price of AS and ES. ES is usually used in the OEM version purchased with the server, such as the purchase of DELL server, with the Linux series of ES. If you want to match the AS series, it will cost thousands more.

WS, which is a further simplified version of ES, is mainly aimed at the desktop office market within the enterprise, and is rarely used in China. Both Fedora Core Linux and Enterprise Linux of Redhat need to follow GNU protocol.

That is, you need to release your own source code. So, for free Fedora Core Linux, you can download the ISO engraving directly from the Redhat website, and you can also download it to SRPM's ISO, the package source CD.

For the paid Enterprise Linux series, it is a commercial product, so the ISO file cannot be downloaded on the website, so you need to purchase a formal license.

Because Enterprise Linux also needs to follow the GNU protocol, the source code must be released. So on the Redhat website, you can get the SRPM source ISO files of the AS/ES/WS series. These files can be freely downloaded, modified, and recompiled.

A project called Community Enterprise Operating System was born. His acronym is CentOS system. The CentOS system community downloads all the source code on Redhat's website and recompiles it. After recompilation, since AS/ES/WS is a commercial product, the Logo and logo of all Redhat must be changed to their own CentOS system identity.

For example, after compiling the original SRPM source code of AS4, it becomes CentOS 4.0. After the source code of AS4Update1 is compiled, it becomes CentOS system 4.1. When the source code of AS4Update2 is compiled, it becomes CentOS4.2. Similarly, the 3.x/4.x of the CentOS system corresponds to the corresponding version.

So we say that the CentOS system is the free version of Redhat's AS/ES/WS. With the CentOS system, you can get the same performance and feel as AS/ES. In addition to the standard ISO numbered 1-4 or 1-5, the CentOS system also provides a Server disc that minimizes 1CD.

The system installed with Server CD is a minimized Linux kernel plus whether the commonly used httpd/mysql contains software such as Xwindows desktops that are useless to the server. Prima, Plesk, Virtuozzo and can all be installed on CentOS systems.

The above is what the two major Linux product lines of Redhat in CentOS system are like. Have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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