Virtual Host Virtual Server

Virtual host is on a web server disk space differentiate to certain site, application for users provide necessary components etc, site function, data storage and transmission function. So-called virtual mainframe, also called the "web space", is an operation on the Internet server was partitioned into several "virtual" of the server, each a hosting are independent of the domain name and complete Internet server (support WWW, FTP, E-mail, etc.) function. Virtual host is the Gospel of network development, has promoted the network technology application and popularization. Meanwhile virtual hosting renting service also became network era new economic form. Virtual hosting renting similar houses rent.

What is a web host?

Define 1: virtual host is to use special software and hardware technology, throwing a mainframe computer into YiTaiTai "virtual" the host, each one virtual host are independent of the domain name and IP address (or sharing IP address), with complete Internet server functions.

Definition 2: virtual host is to use special software and hardware technology, throwing a real physical host computer divided into multiple logical storage units, each unit has no physical entity, but each physical elements like real physical host as on the network, with separate domain names and IP addresses (or sharing IP address) as well as the complete Internet server functions.

Virtual hosting key technology is the same, even in the same platform hardware, operating system, running for multiple users to open different server program, not interfere with each other. But each user has part of his system resources (IP address, document storage space, memory and CPU time, etc.). Virtual mainframe between full independence, in the outside world view, each one virtual host and a separate mainframe performance is identical. So this is the logic of the main engine is image virtualization of called "virtual host".

Virtual host system for the emergence of Internet technology, is the major contribution, is broad Internet users of the Gospel. Because many sets of virtual mainframe sharing a real mainframe resources, each user susceptive hardware expenses, network maintenance cost, line, the costs are greatly reduced, Internet really become everyone with a network. Now, almost all the American company (including some families) are on the network have established their WEB server, including a considerable part adopts is a virtual mainframe.

A server on the different virtual host is independent, and by the user to management. But a server host only able to support a certain number of virtual mainframe, when more than the quantity, the user will feel performance sharply.

Virtual mainframe technology is the Internet servers server hardware cost saving technology, virtual mainframe technology mainly applies to the HTTP service, will be a server of a certain or full service content logic division for multiple service units, foreign performance for multiple servers, which make full use of the server hardware resources. If the division is system level, it is known as a virtual server.

Advantages and disadvantages

advantages

(1) compared to buy independent servers, website construction cost greatly reduced to the popularization of small and medium-sized websites provides great convenience,

(2) the web server server management simple, such as software configuration, anti-virus, prevent attacks and other security measures by professional service providers, greatly simplifying the server management complexity,

(3) website construction efficiency, and buying their own server to the installation of operating system and application software takes longer, and a virtual host usually only minutes can open, for now the main service providers, has achieved the whole operation flow of e-commerce, choose to suit oneself needs of virtual console, online payment immediately after can be opened.

faults

(1) some functions have been services of the restrictions, such as possible cost system resources of the BBS procedures, flux statistic function etc;

(2) website design should take service providers function supports, such as type of database, operating systems;

(3) some virtual mainframe website access speed too slow, this may be due to the hosting provider will host computer lease to large Numbers of website, or server configuration and other reasons caused by, this situation website themselves cannot be solved, for the website of normal visit detrimental effects,

(4) some service providers to website traffic have certain restriction, such as site traffic bigger when will not normal visit.

Visible, the website is a virtual mainframe or a dedicated server, need according to the website of the situation and expected development status of integrated consideration.

Why to set up virtual host

Virtual mainframe technique appears, is to the Internet technology and network development important contribution, because many sets of virtual mainframe sharing a real mainframe resources, greatly add to the server and communications lines utilization ratio, make a single server can no conflict to configure multiple network IP address, this means that people can use virtual host put several with a private domain site hed in a single server, no need for a site and purchase individual server and use the money for network information export application line. Now, the majority of domestic and foreign enterprise destinati had adopted the same server disk space rental way (i.e., virtual mainframe), virtual hosting the benefit is not only greatly saves server purchased and leased line cost, also do not have to use and maintenance of server technology problem, also need not worry that have a special server management personnel.

Virtual hosting low cost but high utilization rate, quickly attracted smes. In order to adapt to the China's entry into WTO increasingly fierce competition of international trade environment, to speed up to small investment, earnings fast online trading platform, strengthen the application of Internet e-commerce, enterprise information construction of strength, such as virtual mainframe destinati has become an important means to improve the competitiveness of enterprises.

Virtual host is the Gospel of network development, has promoted the network technology application and popularization. Meanwhile virtual hosting renting service also became network era new economic form. Virtual hosting renting similar houses rent. Server will be separated into the rental server hosting, then will they rent to users earn profit. Virtual hosting is recently developed fast an Internet mode, and is an important basis of network economy component, now Internet most web relies on virtual hosting forms built.

Internet has increasingly become the center of attention, in business today, the rapid development of technology of enterprise informatization has become an important means of market competition. Towards the market, internationalized or maintain domestic market from atrophic one of the necessary conditions, is must have unimpeded modern international contact means: your own domain name, its own home page, own E-mail address, own propaganda positions. No matter where, the enterprise enterprise condition how, server disk space rental, network virtual hosting services can make the enterprise informatization into reality.

The network has increasingly become an important way of marketing, but any enterprise develop on-line electronic commerce is a very careful things, because it's in manpower on investment is very big. Enterprise in does not have sufficient conditions, the first on the network to build a virtual mainframe conducting e-commerce attempt is very necessary. Let the professional company to undertake system maintenance and management, makes the enterprise can save more human and expenses do other business. Set up their own virtual mainframe (web server), will have the long-term online electronic advertisement.

Virtual hosting advantage

Cheap, despite online information release possess obvious publicity function advantage, but the cost is low still is unthinkable. Radio and television advertising although in seconds, but also cost calculation easily thousands; Newspaper advertising is expensive, beyond most unit individual endurance. Online information release due to save newspapers of printing and radio and television expensive production costs, charges reduced greatly, make most unit individual may inherit. Bestrow scope, the traditional media whether television, newspaper, radio, or light-box posters all cannot cross regional limits and only to specific areas influenced. Clinch a deal for the high probability, traditional media advertising, the audience is mostly passive acceptance, is not easy to produce the result. Form is lively, using multimedia technology, information on the Internet to smother, text, voice, like a variety of forms such as will be the product of shape, utility, use method, price, buy methods in user information directly before the show. With real-time, the businessman can according to the market's needs to change at any time the contents of advertisements, flexible and convenient. More importantly, for enterprises and institutions concerned, the user is currently the most money, convenient and practical way.

Internet now in league with nearly YiTai computers, these computers no matter what they are running model, what operating system, use what software, can be classified into two categories: client and server.

The client is visit other information machines. Through the post office or other ISP dial-up service, the computer was temporary assigned a IP address, using this temporary id card, can in the Internet in an ocean of information, network break line, computer delivered from the Internet, IP address also be retrieved.

The server is to provide information to let others to have access to the machine, are often called the host. Because people ever access to it, so as the main engine must zhongsheng connection in the Internet, have their own permanent IP address. So not only to the setting of the special computer hardware, but also hire expensive DDN, plus various maintenance cost such as rent, artificial, electricity, etc, is not good bear. Therefore, the people developed virtual host system.

Using virtual host system, can put a real host into many "virtual" the host, each one virtual host are independent of the domain name and IP address, complete with Internet server functions. Virtual mainframe between full independence, in the outside world view, each one virtual host and a separate mainframe exactly the same. As well, but the cost is not the same. Because many sets of virtual mainframe sharing a real mainframe resources, each virtual mainframe users susceptive hardware expenses, network maintenance cost, line, the costs are greatly reduced, Internet really become everyone with a network. At present, many enterprises to establish websites are using this method, thus not only saves much buys machine and leased line cost, also do not have to use and maintenance of server technology problem, needless to employ special management personnel.

Virtual mainframe related properties

In prosperous market choose a lot of back, as bright eye consumers, in many of the virtual mainframe provider between how to make the right choices? The personage inside course of study thinks, virtual mainframe performance mainly and the following aspects are concerned.

First, the server stability and speed

Virtual mainframe computers as the network service, the most important is the system stability. Stability about virtual hosting online rate, directly related to whether a site can be accessed. Hosting the performance depends on the server's allocation and use operating systems, software itself factors besides extent and computer room in place of surroundings. Bandwidth is the speed of guarantee, server speed, depends on bandwidth. And bandwidth refers to the virtual host connected to each server bandwidth, a lot of service provider promotion propaganda connect into the room only often the bandwidth of the value, but no instructions per server's available bandwidth. As consumers should be carefully. But as affect server stable external factors concerned, computer room temperature, humidity, artificial control also appears especially important, it and service provider to computer room management and maintenance of costs involved. Big service provider within his room temperature, humidity, artificial controls extremely strict, this reduces the server did not active. Therefore generally so-called brand host the prices are higher, this part of the price is host to maintain commercial computer, so also is sensible.

Second, server equilibrium load

Virtual host in one physical server technology makes it possible to create multiple sites, virtual mainframe indeed reduce the Internet enterprises the establishment of the charges, but everything has a limit. According to experience, when a virtual host site about more than a certain number (200) later, server performance will be decreased obviously, if some of the site also provides database query service, the server performance decline much more intense, some international famous and large virtual mainframe provider will even each server on the number of users in 100 forced restriction within. There are some service providers in order to attract more customers, incredibly dare to put a few yuan virtual host mark into hundreds of people online at the same time, have more very person can say not limiting any resources. Such a promise you can imagine, a physical server can support the maximum number of online at the same time is usually 2000-3000 people hae concurrent, the cost of a normal server in 1 million yuan/year or so, think carefully, and services in order to earn back cost, put how many such sites run on a server, such server used?

Third, powerful technical support

Enterprise or individual using virtual host will site based on someone else's server, sometimes like the child foster at someone's house, although have food to eat, drink can worry or unavoidable. As virtual hosting providers should fully understand the users' mood, and provide timely emergency treatment and related technical solutions and services, more should with abundant technical basis and extraordinary responsibility well hosting site construction and maintenance, and related information value-added services. In fact provides a virtual hosting service is has quite high technical doorsill, according to the personage inside course of study introduces, web hosting service provider besides must control all operating systems and related operating system management, optimize, and possess in these operating system on the system level and the application level of ability (such as various r&d web server, mail server, DNS server, load balance, etc.), still must possess wan, LAN and other network management ability (such as understand routing, exchange, etc), and computer hardware principle of management level configuration database handling ability, etc. If virtual hosting no professional technical team provide as mentioned above technical support, the virtual hosting not only can only provide poor service, and the stability of services to ensure there.

How to choose a web host

1, IP address to access

First of all, if your host site users future oriented is domestic, it must be to consider is the virtual host's IP address in domestic access to whether can smoothly, it is due to reasons known.

If you buy the IP address of the visit, but also a refund is less than PowWeb troubles, like this in foreign countries are good mainframe business, but it's IP in domestic visit incomplete, and that cannot be bought.

2, host computer hardware facilities

Virtual mainframe provider have virtual mainframe computer room, what is the size of the data center. Whether there will be enough room routes of bandwidth, virtual mainframe website links whether and satisfy all the speed of virtual mainframe customer traffic bandwidth.

Because abroad virtual mainframe business customers a lot, so their data center overall foreign line line frequency width is relatively must super-large to meet the demand.

3, virtual mainframe erection site on how many

Usually a virtual host to erect hundreds to thousands website. If a virtual hosting site number, he should have more CPU, memory, and use server array, if from virtual mainframe host distributors with purchased virtual mainframe words, virtual mainframe host distributors in order to reach the highest profit, in a host erect as many websites, and virtual host server but no hint, cause customer sites in virtual hosting speed obstructed. Therefore, the best way is to find a reputable large virtual mainframe provider, their every virtual host server is a web site is carrying restricting tags. But this is usually not open. Of course, if the site has a high speed and control requirements, the ultimate solution is to buy their own independent servers.

4, use VPS server build a website

Virtual mainframe between websites will mutually preempted resources, if the budget permits, can buy VPS server hosting, it is virtual hosting upgrade edition, but not be a complete server, is a moderate consideration. In addition, there are relatively popular now domestic server sharing. Virtual mainframe technology is the Internet servers server hardware cost saving technology. Virtual host system mainly applies to the HTTP service, will be a server of a certain or full service content logic division for multiple service units, foreign performance for multiple servers, which make full use of the server hardware.