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This article mainly introduces what is the difference between RedHat CentOS Ubuntu Fedora in Linux. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

1. It is said that RedHat is synonymous with Linux, that is to say, RedHat's Linux is recognized by most people.

But: what are the specific connections and differences between RedHat.Enterprise.Linux.5 and RedHat Linux 9.0 and RedHat Fedora core? Where did CentOS come from? our company uses CentOS. Is this good? what's good about it?

The reason why RedHat became famous: with a long history, he began to operate Linux; in 1993, providing complete solutions, more professional, unlike debian in the form of a community; the original rpm package makes it very easy to install Linux software and eliminates the trouble of compiling.

RedHat in the release of version 9.03, no longer continue the previous development code, but named after RedHat.Enterprise.Linux (referred to as rhel), that is, RedHat Enterprise Edition, now has been developed to 5license seems to start from 3, customers need to buy license, that is, you need to pay for subsequent updates and services of the system (you can update for 60 days free of charge, and if you do not want to enjoy the update, the system can be used free of charge. ), and the free version of its personal desktop is being done by the RedHat community, which can be supported by RedHat. The version released by this community is Fedora (literal translation is also a kind of men's hat), which is released twice a year, and now it has been released to 10 rhel. Fedora has always been a testing ground for Fedora, and the software used in each version is almost the latest version of the kernel and library, so it is difficult to configure. However, based on the basis of RedHat, there is still a large proportion of people using Fedora. CentOS compiles rhel again, removes the RedHat flag, and has a community-released version of Linux, so there is almost no difference between CentOS and rhel. The main difference is that you don't have to pay to use it. From rhel's point of view, CentOS is very suitable for enterprises.

two。 As far as I know, RedHat is the publisher of Linux, in addition to Ubuntu,debian,SUSE,redflag and so on. Since Linux is free, why do so many companies specialize in Linux distribution? why do they do it if they don't make money? And I think they can definitely benefit from it, but I don't know what's wrong with it. If you understand, tell me more about this.

If the distribution is profitable, what does linus, the author of the Linux kernel, benefit from?

Has linus, the original author, been working on every upgrade of the Linux kernel? Is there any brokerage return to the author for the manpower and material resources spent on each upgrade?

Linux profit method: Linux personal desktop version can be obtained and used free of charge, but like RedHat Enterprise Edition and redflag Red Flag Enterprise Edition, you need to purchase services. The Enterprise Edition is mainly aimed at banks, governments, or large enterprises, which require high stability and security. Compared with expensive unix,Linux, there is still a market. Personal desktop version is not unprofitable, at least many Linux communities will not lose money, because people who work for the community are distributed around the world, the development of Linux is also done in their spare time, not to get paid, but only to work for a persistent job. After the release of the Linux version of the community, users can buy a Linux installation CD, although the CD is very cheap (compared to Microsoft's system), but because the cost is almost 0 So there is still a surplus. In addition, there are many pre-installed Ubuntu notebooks on the market, such as dell, so Dell must pay a fee for Ubuntu, which is, of course, much lower than pre-installed vista.

Now the kernel of Linux should be done by GNU, not linus.

3. There are so many distributions of Linux mentioned above, which ones are better and what are the advantages? Should the version of Linux be chosen differently depending on the purpose of Linux? Please elaborate on the strengths and weaknesses of each version.

RedHat Enterprise Edition (rhel), suitable for enterprise use, excellent stability and compatibility are shown in that each version uses relatively mature libraries and kernels, and some large EDA software is tested and installed in advance, such as cadence, so it is more suitable for servers and workstations, but not for personal desktops, because if you do not buy license, you will not be able to enjoy rich updates, and because the kernel and libraries are relatively conservative. It can't keep up with the development of Linux, so that a lot of entertainment software is very difficult to install. CentOS is similar to rhel.

Fedora, as mentioned earlier, this version is so aggressive every time it is released that many drivers are not well configured, but the latest Fedora10 is conservative and stable. The yu software source is based on rpm package management, making it easy to install the software.

Ubuntu, based on debian, the desktop environment is mainly gnome, is the most popular Linux personal desktop, its advantage is that it is very easy to configure, after installing the system, as long as the hardware is not too new, basically no other configuration, the hardware can identify and install drivers. And its apt update source server is very rich in software, as long as a command, you can automatically download and install the required software from the network. Ubuntu is so easy to install that you can even use wubi to install Linux in the windows partition. There are many derivative versions of Ubuntu, including KUbuntu (the desktop uses KDE, which is more gorgeous), xUbuntu (with xfce, which requires less configuration), and eUbuntu (for children and education), which users can choose according to their needs, preferences, and hardware configuration.

Suse is known as the most beautiful Linux distribution, of course, its essence is the same as other versions, except that developers make some efforts in window art, and of course, it takes more system resources to get gorgeous. Other versions of Linux can completely achieve the effect of suse through some modifications.

Redflag, the Linux version developed by the Chinese Academy of Sciences, is mainly for government users, and its personal desktop version is free. This version of art is very close to windows, making it easier for users to get started, but in fact, desktops are also based on KDE, which is very common.

Puppy, a very small version of Linux, installs a mirror image of more than 90 M, but includes graphical desktops, browsers, offices and other commonly used software, which are all stored in memory when the system is running. It is said that the puppy installed in the USB disk can be removed after the system boot, and the system can still run.

4. My brief understanding of Linux is that all distributions use the same Linux kernel. It's just that depending on the release time of each version, the kernel version will be different. I don't know what I understand, right?

At present, the kernel of Linux is still developing rapidly. the common version is 2.x, X is odd and unstable, and x is even and stable, such as 2.4 adopted by rhel and 2.6 adopted by many personal desktops. Different Linux distributions use different kernels. For example, Fedora generally uses the latest kernel.

5. The reason why there are so many problems is that my brain at this time has a very confused understanding of Linux, and the understanding of the operating system is only a simple understanding of genuine windows and pirated windows. Let's not talk about piracy for the time being. as far as genuine copies are concerned, I know that some versions of Linux are free and most of them may be free. why are there two phenomena: charging and free? As an enterprise server application, can the free version of Linux handle it? is the free version much worse than the charged performance and security? Talk specifically about free and paid Linux, and talk about the difference between the two.

Already mentioned some, as for the free version, if you use a more conservative and mature version, stability should be guaranteed, security, not very clear, from the point of view of the rhle used by my unit, there is no big difference with the ordinary Linux personal desktop.

6.OpenSource and Free: is the paid version of Linux not an open source operating system? Paid Linux is definitely not open source, is it? Because if open source, people all know your source code, developers will not be able to sell their distribution of Linux. I don't know what I understand, right? Please talk about "Open Source and Free" in detail.

In the case of RedHat, they have both a paid rhel and an open source CentOS obtained by decompiled rhel, and it is entirely up to the user to use that. From this point of view, the difference between open source and free lies only in what is open source. On the basis of abiding by the gnu agreement, anyone can get the source code of the program, and can modify it and release it again; while what is free can only be used for free and cannot be modified.

The above is all the content of the article "what is the difference between RedHat CentOS Ubuntu Fedora in Linux". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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