Basic knowledge that webmasters must understand

The following are the basic knowledge of webmasters.

What is a virtual host?

Virtual Hosts use special hardware and software technologies to divide a server host running on the Internet into a virtual host. Each virtual host has an independent domain name, it has complete Internet server (WWW, FTP, email, and so on) functions. Virtual Hosts are completely independent of each other and can be managed by users. in the outside world, each virtual host is exactly the same as an independent host. I want to provide high-quality network environments and servers for small and medium-sized customers, and the Senior Network Management is responsible for monitoring.

What is asp?

ASP is the abbreviation of Active Server Page. It is a Web page that contains the code of a script program using VB script or JScript. When the browser browses ASP Web pages, the web server will generate the corresponding HTML code based on the request and then return it to the browser, so that the browser can see the dynamically generated web page. ASP is an application developed by Microsoft to replace CGI script programs. It can interact with databases and other programs. It is a simple and convenient programming tool. After learning the basic syntax of VBScript, you can easily compile your own ASP system by knowing the usage, attributes, and methods of each component. The format of ASP Webpage files is. asp.

What is FSO?

FSO (FileSystemObject) is a control of Microsoft ASP for file operations. It can read, create, modify, and delete directories and files on the server. Is a very useful control in ASP programming. However, due to permission control problems, FSO of many virtual host servers has become a public backdoor for this server, because customers can directly program the control in their own ASP Web pages, to control the server and even delete files on the server. Therefore, many virtual host providers in the industry simply turn off this control, reducing the customer's flexibility.

The w2k virtual host server that I want to secure has high security. It allows customers to use it in their own website space without compromising the system or interfering with the normal operation of other customers' websites.

What is CGI?

CGI is a standard used to determine the communication mode between the Web server and external programs, so that external programs can generate HTML, images, or other content, server processing is the same as processing HTML, images, or other content generated by non-external programs. Therefore, the CGI program book only enables you to generate the statement content and generate dynamic content. The reason for using CGI is that it is a well-defined and widely supported standard, and dynamic web pages cannot be implemented without CGI, unless you use the special methods provided by some servers (today, other technologies except CGI are gradually becoming the standard ).

What is Php?

PHP is a server-side HTML-embedded script Description Language. Its strongest and most important feature is its database integration layer. using it to complete a Web page containing database functions is incredibly simple. In HTML files, PHP scripts (similar to Perl or c) can be referenced using special PHP labels, so that the web page Creator does not have to rely entirely on HTML to generate webpages. Because PHP is executed on the server side, the client cannot see the PHP code. PHP can complete any task that CGI scripts can do, but its function depends on its compatibility with various databases. In addition to HTTP Communication, PHP can also use the IMAP, SNMP, nntp, and POP3 protocols.

What is host leasing?

Dedicated hosting means that the customer does not need to purchase their own servers, but can directly use multiple advanced servers and software systems that I want to prepare carefully, greatly saving the procurement cost, in our IDC, what is the bandwidth? Secure? Stable? System?

What is m space? How big is it?

For enterprise websites and even some portal websites, Mb is enough space. If the text is simply placed, more than 50 million m is equivalent to 1000 Chinese characters. If calculated on a standard webpage, it can roughly accommodate 2000 pages of A4 size and page images.

How to handle network faults?

Network faults are related to telecom service providers, that is, service providers that provide server rooms and hosting services to website service providers. Currently, there are two reliable service providers, China Netcom in the north and China Telecom in the south. If their lines are broken or the network is blocked, the website may be inaccessible. Another possibility is that the local telecom DNS server is faulty or the refresh is not timely, which may cause Website access problems. These problems are beyond the capabilities of the website service provider.

Solution: there is no good solution for telecom faults. Generally, the Service Chamber of Commerce helps you understand the fault resolution situation and provides immediate support and feedback.

Why cannot I upload a file or cannot see the uploaded page after the file is uploaded normally?

Because our server is equipped with anti-virus software, if the file you uploaded carries a virus, it will be deleted by the anti-virus software on our server. Therefore, please clear the virus before uploading.

Does the performance of each VM decrease as resources are allocated to multiple VM instances?

Theoretically, this is the case. However, because the computers used as virtual hosts use computers with high performance, a host can support a certain number of virtual hosts. When the number of hosts exceeds this limit, the user will feel the performance is degraded. If configured properly and over-high-speed lines are used, the performance of virtual hosts is usually better than that of independent hosts connected by low-speed lines (such as 256 K and 1.544 m. In a competitive environment, we will not increase the number of virtual hosts and sacrifice the interests of users to pursue the ultimate profit. Because in that case, we will lose our emperor.

My webpage is normal locally. Why can't I see any images after uploading?

1. Make sure that the image has been uploaded to the server. 2. The picture inserted during webpage creation should be marked with a relative path. If you accidentally use an absolute path, for example, C:/images/a.jpg, you will be able to browse locally normally but cannot find it after uploading.

After the page is uploaded, why is the original default page displayed?

There are two possibilities: 1. The page is not uploaded to the/root directory; 2. The original default page is not deleted or overwritten.

Does Linux Virtual Host Support CGI?

When a CGI program is uploaded on a Linux Vm, if a DOS file is directly uploaded, an error message is displayed. You must convert it to text format before uploading. Generally, this type of error will cause the following error message "internal server error the server encountered an internal error or misconfiguration and was unable to complete your request. please contact the server administrator, webmaster @ yourdomain and inform them of the time the error occurred, and anything you might have done that may have caused the error. more information about this error may be available in the server error log.- --------------------- Apache/1.3.22 server at bitterhot.l4.bizcn.com port 80 ".

PHP Disabled functions?

Due to security settings, PHP does not support the following functions: phpinfo, popen, exec, passthru, system. if you use these functions on our Vm, no response is returned.

How to Use MSSQL and Access database?

With SQL Server7.0 (Chinese version), you can use the new SQL Server registry of Enterprise Manager to connect to our server over the Internet. (Note: Please check the SQL Server IP address in our nt activation letter. The user name and password are the same as those of FTP ).