There are many types of hosts. The mirror server and primary server have the same service content but are located in different locations. Both are used to share load on hosts. Mirror server refers to two or more servers that are similar to mirrors and can be seen but not the original one. The content is completely understood and updated synchronously. In addition to the main server, the others are called mirror servers.

What does the image server do?

1.load balancing based on DNS

DNS load balancing is implemented through random name resolution in the DNS service. In the DNS server, the same name can be configured for several different addresses, and the client that finally queries the name will get one of the addresses when parsing the name. Therefore, for the same name, different customers will get different addresses, and they will visit the Web server at different addresses, thus achieving load balancing.

2. Load balancing based on specific server software

Mirroring technology realizes load balancing through the redirection function of network protocols. For example, Http can implement the location instruction. The browser receiving the instruction will automatically redirect to another URL specified by the instruction. Sending location instructions takes less of a load on a Web server than executing a service request, so you can design a load-balancing server with this capability. Once the Web server decides that it is under a lot of load, it no longer sends the requested web page back to the browser. Instead, it sends a location command to the browser to get the desired web page from another server in the server cluster. In this mode, hosts need to support mirroring, but there are some difficulties, such as how a server can ensure that the host it redirects is idle and does not send location instructions again. Neither the location instructions nor the browser can do this, so it becomes an endless loop in the browser. Therefore, the practical application of this way is not common, and the server cluster software of this way is also less.

3. Load balancing based on seven-layer switching technology

The load balancing technology based on Layer 7 switching is mainly used for load balancing and quality of service assurance of Web applications. Layer 7 switch can not only check the TCP and UDP port numbers of TCP/IP packets and forward them to a server in the background for processing, but also analyze Http request urls from above the session layer and send different Http requests to different servers for processing according to different urls. You can even have multiple servers respond to the same URL request to share the load.

4. site mirroring technology

Most load balancing techniques are applied to server farms within a site, but because the bandwidth to access the Internet is limited. Site mirroring technology applies the load balancing technology to different network sites and utilizes the DNS load balancing technology.

To sum up, "is the definition of the mirror server and the role of sharing, I believe you have some understanding of the mirror server, if you need server rental service welcome to our official website to buy.