Foreword:
With the development of computer technology, learning based on the network environment has become a new learning concept and learning environment, and has changed the learning life of teachers and students in the high campus area. However, with the rapid increase in the number of visits, how to build a shared platform for the graphic information resource center of the whole school to ensure the stability and high service quality of the platform during operation is the key problem to be solved. Especially when the large-scale concurrent access brings the business volume of each core part of the network to increase, the number of visits and data traffic increase, the corresponding processing power and computing intensity also rapidly increase, which causes overload of core network equipment, network bottlenecks and Problems such as network congestion. In this case, simply pursuing high-performance hardware to solve the problem will undoubtedly cause high cost investment; and, no matter how excellent the equipment is, it will not be able to cope with the current and future fast-growing business demands. Therefore, studying the practical application of load balancing technology in the network teaching environment has become an important means to solve the above problems.
Project Overview:
The technical college is a private tertiary college recognized by the Ministry of Education, with more than 7,000 teachers and students.
Facing the education network informationization, the college has established a perfect modern digital library system. The system integrates a number of subsystems, such as the college automated book query system, the China Journal Net database, Weipu periodicals, Chaoxing books, scholar books, CNKI and so on.
All servers in the system are running Web applications, APP applications, and database services at the same time; and differences in resource utilization and server configuration also cause differences in server load. For example, the servers of the China Journal Network and the Superstar e-book server are overloaded and cannot provide high-performance application services, while the e-book server of the scholars is generally loaded.
Moreover, due to different applications, chaos and no planning, the system load remains high, but the number of concurrent users is not up. For example, the download traffic of the attached CD is bursty, you can consider using the least connection number algorithm to provide services; the library bibliographic retrieval flow is stable, the server resource is small, and the polling algorithm can be considered; the academic journal server uses the priority algorithm The server priority of full-text data is high. These are not considered in the previous deployment.
Network structure:
client needs:
Provide a comprehensive practical server load balancing solution for multiple applications.
The 7x24-hour service of the system is ensured through HA, and an application-based health check mechanism is provided. Ensure the stability and high reliability of the overall system.
The application server group includes multiple Web servers, APP servers, FTP servers, etc .; the database server group consists of various database servers, such as SQL Server, TRS Server, MySql, KBASE, and Sybase, etc., which requires Web applications, App applications and database services Physically separate, improve the overall performance of the information platform; rationally plan the application protocol to shunt, enhance bandwidth usage, and increase concurrent users who access simultaneously.
The proposed solution must minimally affect the existing system and have good scalability in the future.
Barracuda load balancing solution:
· The dual-machine HA redundancy structure of two barracuda safety load balancers LB440 is used to realize the load balancing of each application by itemized planning as described in the following table.
· According to the application status of various subsystems, Barracuda LB440 uses different algorithms to achieve server traffic management (see table below).
· Use Barracuda LB440's rich session retention mechanism to control the consistency of application access.
· Adopt various barracuda health check methods, and barracuda's unique invisible heartbeat line design to support the second-level switching and achieve the consistency of the application when the system is switched.
· The application-based structure facilitates the seamless expansion of more systems in the future. The most cost-effective solution to protect users' investment.
Why choose Barracuda:
High performance: The Barracuda LB440 application switch provides the industry's strongest server load balancing performance, supporting 100,000 new connections per second and 9 million concurrent connections.
Powerful security protection: The Barracuda Security Load Balancer has a built-in integrated IPS real-time security protection system that can detect and block more than 1,000 intrusion attacks and DOS attacks.
Key technical explanation:
· IP and Cookie session retention
The Barracuda Load Balancer can choose to use IP or Cookie retention to fully guarantee session consistency and provide reliable session retention features for various critical applications.
· Real-time monitoring of fully redundant mirror / "heartbeat" technology
The redundancy configuration of the Barracuda load balancer is very simple. They do not require any special cables to connect, as long as they can be addressed by IP. The physical topology is a simple and easy routing mode. When one barracuda load balancing machine is shut down due to maintenance or failure, another barracuda load balancing machine will take over its work at the fastest speed. At the same time, the barracuda load machine second-level failover technology ensures the uninterrupted operation of each application service system.
· Advanced server management technology
The Barracuda Load Balancer can perform weighted calculations on servers with different performances, and can share more traffic with servers with good performances. For servers with a limited number of users, the Barracuda Load Balancer uses connection limit technology to ensure that the server connection does not exceed the limit, and also ensures that the server with average performance will not be down due to too many connections. Barracuda load balancing has two scheduling types and three dynamic weight scheduling methods.
· Multi-layer real-time server health check
The Barracuda Load Balancing opportunity performs a health check on the background server in real time and decides how to handle the service if the real server is unavailable. The service monitoring mechanism of the Barracuda Load Balancing Machine can be implemented on Layer 3/4 (PING, PORT, etc.) and Layer 7 (DNS, HTTP, SMTP, etc.).
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