VPS server is a server virtualization and automation technology, which adopts operating system virtualization technology. The concept of operating system virtualization is based on the process of sharing the operating system kernel, so that the virtual server does not need an additional virtualization kernel, so the resource consumption of the virtualization process is lower, so that more virtualized servers can be realized on a physical server. These VPS servers share hardware, software licenses and management resources with the highest efficiency. Each VPS server can be restarted independently, with its own root access rights, users, IP addresses, memory, procedures, files, applications, system function libraries and configuration files.

VPS server technology supports Linux and Windows platforms. Virtuozzo server for Linux also supports different Linux distributions, and the kernel version on the virtual server is the same.

Composition and principle of DNS:

1.IDNs consists of three parts: domain name service module, database module and management module.

(1) domain name service module: responsible for responding to DNS query requests; Analyze that source address of the request; Look for records in the corresponding database.

(2) Database module: responsible for storing DNS records and organizing them according to different geographical proximity.

(3) Management module: start and stop DNS service; Modify DNS records; Modify the geographical proximity configuration.

2. Working principle: iDNS system handles requests differently from ordinary DNS. When iDNS receives a DNS resolution request, it will first determine the source address of the request. Depending on the source address, IDN will look up the corresponding records in different DNS database tables and return the geographically adjacent resolution results. The source address is different, and the returned results are different.

3. Geographical proximity: IDN's understanding of geographical proximity is not physical proximity, but virtual proximity in the network. We know that in the current domestic Internet environment, the access efficiency between computers in the same autonomous domain system (such as China Netcom Group) is much higher than that in cross-autonomous domain systems (such as China Netcom Group and Education Network), and even two computers in the same autonomous domain are far more geographically than two computers in cross-autonomous domain systems. In other words, the computer of Beijing Netcom can access the computer of Hebei Netcom faster than the computer of Beijing Education Network.