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This article mainly introduces CentOS, Ubuntu, Debian what is the difference between the three linux, the article is very detailed, has a certain reference value, interested friends must read it!

Ubuntu

Ubuntu has more and more fans in recent years. Ubuntu has a beautiful user interface, perfect package management system, strong software source support, rich technical community, and Ubuntu has good compatibility with most hardware, including the latest graphics cards. All these make Ubuntu more and more popular. But don't forget: all you need is a simple, stable, easy-to-use server system!

Ubuntu's graphical interface is beautiful, but it also determines that its best application area is the desktop operating system rather than the server operating system. How you want to have an immersive environment in the process of learning Linux, then Ubuntu is really good: install it only on your own computer, not on the server. At this point, Ubuntu is not the operating system of choice for VPS installation, and I'm sure you won't pay for hundreds of megabytes of drivers and precious memory.

CentOS

You will find that many commercial companies deploy servers in production environments using CentOS systems, and CentOS is a community redistribution compiled from RHEL source code. CentOS is simple, humanized under the command line is relatively good, stable, with strong English documentation and the support of the development community. It has the same origin as Redhat. Although it does not provide separate business support, it is often possible to find a clue in Redhat. Compared to debian, CentOS is a little larger. Is a very mature Linux distribution.

Debian

Generally speaking, as an operating system suitable for servers, Debian is much more stable than Ubuntu. It can be said to be incomparably stable. The whole debian system, as long as there are no logic flaws in the application layer, is basically solid, and it is a system that does not need to be restarted all the year round (this is exaggerated, of course, but not its stability). The basic core of the whole debian system is very small, which is not only stable, but also occupies small hard disk space and memory. The 128m VPS can run Debian smoothly, while CentOS will be a little laborious. However, due to the development route of Debian, there are a little less help documents and less technical materials compared with CentOS.

Because of its excellent performance and stability, Debian is very popular with VPS users.

In addition, there are a series of Linux, FreeBSD, Unix and other systems such as Arch Linxu, Gentoo, Slackware, etc., which are more professional in the field and rarely appear in VPS, so they are not introduced.

For beginners, we recommend CentOS or Debian, both of which run smoothly on a less configured VPS. However, if the VPS configuration is too low (the OPENVZ memory is less than 128m, or there is less than 192 MB in the XEN architecture), it is recommended to use Debian; otherwise it is recommended to use CentOS to get more online help and support to make it easier to get started.

CentOS, Ubuntu, Debian three linux are very excellent systems, open source systems, but also paid commercial version and free free version, the following is a brief comparison of these three systems.

CentOS system

Many webmasters generally choose centOS system, and CentOS is compiled and redistributed from redhat source code. CentOS removes many applications that have nothing to do with server functions, the system is simple but very stable, command-line operations make it easy to manage systems and applications, and are supported by helpful documentation and the community.

Ubuntu system

Ubuntu has a beautiful user interface, perfect package management system, powerful software source support, rich technical community, and Ubuntu supports computer hardware better than centos and debian, and has strong compatibility, Ubuntu applications are very many, but for the server system, personal feeling does not need too many applications, what is needed is a stable, easy to operate, simple maintenance system. If you need to use a graphical interface on the server side, ubuntu is a good choice, you need to note that the graphical interface takes up a lot of memory, and the larger the memory, the higher the price of vps.

Debian system

Debian is also very suitable to do server operating system, compared with Ubuntu, it is not too fancy, stability overwhelms everything, for the server system is a constant truth, debian this linux system, the underlying layer is very stable, the kernel and memory occupation is very small, in the small memory VPS can run Debian smoothly, such as 128m memory, but debian help documentation and technical materials are relatively few. Debian is preferred for small memory, and debian is preferred for vps experts who are very familiar with linux systems.

In the choice of the system, it belongs to the novice, the first choice is CentOS, it is not that centos is better than Debian and ubuntu, but centos is the first choice for beginners to install vps, it is stable and takes up less resources, it can easily search the installation configuration documents on the network, and its own help documents are also very powerful; if you are a linux master, the master generally chooses debian, because the master can run the system stably on the low-equipped vps. And ubuntu, although the system is free, but it is suitable for rich people to play, it takes up more resources than the previous two systems, and vps basically sells memory, the higher the memory, the more expensive the price.

We run some of the largest Internet operations in the world, so we attach great importance to reliability and stability, which is our top priority. To do this, we only use Linux to support the customer's system. But which Linux distribution should we use? The answer is CentOS. Why?

As a huge system operator, for a long time, we need to find a reliable and predictable system in a variety of large-scale systems. we need strong support from the world's most powerful software vendors and open source projects. For the most commonly used systems, we need documentation, tools, and global resources.

Because of this, the RedHat / CentOS series of distributions is our choice. They are able to meet all of these needs with relatively few problems and long-term stability, which enables us to provide world-class maintenance for thousands of systems running different configurations, services, and applications.

RedHat Enterprise Linux (RHEL) is the enterprise distribution of the gold standard. It is updated every five years or so and has great advantages in the stability, foresight and security of the system. Whenever a new major version is released, such as 5.x or the most recent 6.x, all versions and code will remain the same, only security issues or major bug issues, such as backdoors, ports, etc., will be fixed by releasing a new subversion.

CentOS is the open source version of the RHEL distribution and is usually released shortly after the release of RedHat. The reason we use CentOS is that the standard support service for the RHEL distribution is very high, about $800 per server, which is a cost that must be controlled for many of our users who have dozens or even hundreds of servers.

There are two potential problems with RHEL/CentOS systems.

First of all, once the major version is determined, nothing will be changed except for security problems and serious failures that will be fixed. While this is good for stability, it is bad for many services. MySQL and PHP services, for example, will undergo heavy development and a lot of changes during the five-year CentOS/RHEL major release cycle. For example, MySQL5.0 is the default version used by the current major version of RHEL/CentOS, but the current MySQL has been updated to versions 5.1 and 5.5.

Fortunately, this problem was easily solved by the Yum package manager. Thus, the major software, such as the actual components in the current RHEL/CentOS, including the kernel and all tools, are still from the distribution, but the additional software, such as Nginx,Apache,PHP,Java and MySQL, come from newer software sources such as Fedora; or obtain updated versions such as MySQL directly from the developer. Here, we have our own dedicated installation image to handle all these things automatically.

Second, the release of CentOS will lag behind the release of RedHat, including key patches and fixes. This is particularly pronounced during the release cycle of RHEL 6.x. But in our experience, there is nothing to worry about and it will never be a problem for us.

Many people ask us why we don't use Debian-based systems, such as Debian or Ubuntu servers. We do support this proposal if we have no choice, but in our experience, these systems are not as stable and reliable as RHEL/CentOS.

We believe that this is partly due to their rapid development and the lack of testing and immaturity between versions and combinations. However, despite their popularity, RHEL/CentOS is still preferred by major service providers and projects so that they can provide services to corporate customers (especially for Oracle and MySQL). In addition, Debian-based systems have many kernel and stability issues, especially in our cloud computing services.

For us, the only reason to use Debian/Ubuntu is:

They can provide the necessary special services for a system, especially when some drivers or some IO subsystems need a new kernel. For example, the ext4 file system or log changes in the most recent kernel, etc.; all of this is now included in RHEL/CentOS6.x.

Of course, most Linux developers use the desktop version of Ubuntu, and understandably, they prefer to use the same system for development and production, and have a lot of interesting tools to use. But overall, we still see RHEL/CentOS as a superior deployment platform, and more than a dozen customers have successfully switched to CentOS as a production environment without any problems, but it's still a daunting task.

The above is all the contents of this article entitled "what's the difference between CentOS, Ubuntu and Debian 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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