CDN

VMRack Content Delivery Network (CDN) is a distributed network system built upon multiple carrier networks, dedicated to efficient global web content delivery.

By deploying edge servers worldwide, the CDN caches content at nodes closest to the user. Combined with load balancing, content distribution, and intelligent scheduling modules, the CDN allows users to retrieve content nearby. This reduces network congestion, improves response speed and hit rates for end-users, and significantly enhances website availability and stability while preventing service interruptions caused by single-point failures.

VMRack CDN solves issues such as cross-region access, multi-carrier interconnectivity barriers, and network latency or instability caused by congestion, ultimately optimizing website speed and usability, reducing origin server load, and providing users with an excellent access experience.

Basic Concepts

To better use VMRack CDN, we recommend you familiarize yourself with the following basic terms:

Term	Definition
Domain	The domain name accessed by end-users to retrieve CDN-accelerated content (e.g., www.example.com). End-users access this domain to enjoy the acceleration services provided by the CDN.
CNAME	A unique alias assigned by the CDN platform for each accelerated domain (ending in .cdnprovider.com). You must configure a CNAME record at your DNS provider to point the accelerated domain to this alias, thereby routing traffic into the CDN network.
Origin Server	The server where you actually deploy your business and store original content. It is the source of CDN data. When a CDN node does not have the content requested by a user (cache miss), it fetches data from the Origin Server. Supports configuration via IP or Domain name.
Node	A cluster of servers distributed across VMRack's global edge network. Nodes are responsible for caching content and responding to user requests from the nearest location. They are key facilities for reducing latency and improving transfer speeds.
Origin Fetch	The process where a CDN node requests data from the Origin Server. This usually occurs when a user-requested resource results in a MISS (no cache or cache expired) at the CDN node.
Origin Host	The value of the Host field carried in the request header by the CDN node during origin fetch. It determines which specific site (virtual host) on the Origin Server the origin fetch request accesses.
SSL/TLS	Cryptographic protocols used to ensure network communication security. Configuring an SSL certificate on the CDN enables data transmission via the HTTPS protocol, preventing data eavesdropping or tampering during transit.
Referer Hotlink Protection	An access control mechanism based on the Referer field in HTTP headers. By configuring blacklist/whitelist rules, it identifies and rejects reference requests from unauthorized domains, protecting origin resources from illegal theft.

Product Advantages

We are committed to providing the best CDN network. After years of deep technical cultivation, our product features the following core advantages:

High Reliability: Utilizes a redundancy mechanism. Even if partial node failures occur, intelligent scheduling ensures services remain stable and online.

High Performance: Backed by self-built data centers and intelligent caching technology, easily handling massive concurrency and traffic spikes. Whether for large file downloads or streaming media, playback remains smooth without buffering.

High Security: Provides comprehensive security strategies, integrating WAF defense, CC protection, and DDoS mitigation capabilities to ensure secure data transmission.

Ease of Use: Offers flexible caching policies and rich configuration features (such as visualized statistics and automated certificate management), making it easy even for novices to get started.

Application Scenarios

Website Acceleration:Tailored for portal websites and e-commerce platforms. Through millisecond-level static resource compression and distribution, it solves slow loading caused by traffic spikes and significantly improves user experience.

Download Acceleration: Designed for distributing large files like game installation packages, medical imaging, and software updates. Utilizes multi-level caching technology to enhance transmission stability, solving connection interruptions and bandwidth bottlenecks to provide smooth download speeds.

A/V Acceleration: Optimized for online education and video streaming platforms. Intelligent scheduling engines drive elastic computing clusters to handle massive concurrency and traffic peaks with minimal buffering, creating a silky-smooth viewing experience.

Security Protection: For websites frequently targeted by network attacks. Built-in high-level security functions defend against vulnerability scanning, CC attacks, and DDoS attacks, preventing site downtime and maintaining business continuity.

Product Versions

To meet the needs of clients with different scales and compliance requirements, VMRack offers two service models:

1.Standard CDN

Oriented towards the general market, focusing on "Simplicity, Clarity, and Extreme Speed."

Target Audience: Individual developers, SMEs, and general websites.

Features: 30GB monthly free quota, Pay-As-You-Go, instant activation, and no hidden fees.

2.Custom CDN

Oriented towards enterprise clients with high requirements for data privacy and network control.

Data Sovereignty: Data is fully controlled by the user, avoiding third-party risks; security policies are self-defined to meet sensitive data processing needs.

Independent Deployment: Users can freely configure CDN service nodes and routing strategies, enjoying exclusive resources and high autonomy.

Node Management: Centralized management of CDN nodes, allowing for rapid response to business changes and optimized control.

Target Audience: Financial institutions, large enterprises, and cross-border businesses with special compliance requirements.