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business applications and virtual data centers The first generation of ADC solutions focuses on common network and application optimization and scalability. The ability to improve service is simple: after installing and adding a new application server to the server farm, you need to add the new server to the associated ADC traffic redirection policy and start to load balance the traffic between the extended farm servers. The second-generation ADC solution acknowledges that applications can be

the environment. 4. E-commerce Web site High-performance, highly available solutions, LVS load balancing (front-end four-tier load balancer). 5. The key point explanation of the construction process, the key step explanation. 6. This program has been used in practical production applications for many times, and can be flexibly applied. Second, the software load balance common several scenarios: 1.lvs+keepalived load Balancing, lvs+keepalived is a four-tier load balancing software under Lin

Now the trend of Web site development to the use of Network Load balancing with the increase of the size of the site according to different stages to use different technologies: 1. Hardware-level load balancing This load balancing is done through hardware, and common hardware has more expensive commercial load balancers such as NetScaler, F5, Radware, and array. Hardware load balancing is an application on the OSI layer fourth (transport layer) Its ad

[MVC Study Notes] 6. Use Memcache + Cookie to solve shared login status in Distributed Systems, mvcmemcache To solve the bottleneck of Single-host processing and enhance the availability of software, we need to deploy the software on multiple servers to enable multiple second-level subdomains in a frequent manner, deploy websites on independent servers based on business functions, or share multiple channels with a group of servers through Server Load balancer technology (such as DNS polling,

Now the trend of Web site development on the use of Network Load balancing with the increase of site size according to different stages to use different technologies:One is the hardware to carry out, the common hardware has more expensive NetScaler, F5, Radware and array and other commercial load balancer, it is the advantage of a professional maintenance team to maintain these services, the disadvantage is that the cost is too large, So for the small

The current development trend of the website for the use of network load balancing is as the scale of the website increases according to different stages to use different technologies:One is through hardware. Common Hardware includes expensive NetScaler, F5, radware, array, and other commercial load balancers, it has the advantage of a professional maintenance team to maintain these services. The disadvantage is that the cost is too large. Therefore,

communication ), in addition, products related to these technologies have also passed IPv6 authentication. In this situation, the reporter is worried about the real effect of a large number of network security products with IPv6 certification marks. Radware security product director Ron Meyran told reporters that although many vendors claim that they have IPv6-certified security products, many vendors only provide a special version, it only supports

balancer in the network is divided into two types: one is carried out through hardware, common Hardware includes expensive NetScaler, F5, Radware, Array, and other commercial load balancers, and Linux-based open-source load balancing policies similar to LVS, Nginx, and HAproxy, In commercial Server Load balancer, NetScaler is more efficient than F5. For Server Load balancer, the commercial Server Load balancer can be built on four ~ The layer-7 proto

PHP multi-server cross-origin SESSION sharing, php multi-domain session With the gradual development of website business scale and access volume, the mini-website architecture originally composed of a single server and a single domain name cannot meet the development needs. In this case, we may purchase more servers and enable multiple second-level subdomains to deploy websites on independent servers in a frequent manner based on business functions; or use Server Load balancer technology (such a

server Load balancer Technology for network applications. It is completely isolated from switches and servers and becomes an independent technical device. This is the object we will discuss now. Generally, Server Load balancer is divided into seven layers based on different network layers. The second layer of Server Load balancer refers to the use of multiple physical links as a single aggregation logical link, which is the link aggregation Trunking) technology. It is not an independent device,

logical link, which is the link aggregation Trunking) technology. It is not an independent device, it is a common technology used by switches and other network devices. As you can see, traditional Server Load balancer is only a load balancing technology. Currently, in the face of complex network application requirements, the independent Server Load balancer device has multiple technical functions including local Server Load balancer, link Server Load balancer, global Server Load balancer, WAN o

Summary : For a large web site, load Balancing is an eternal topic. With the rapid development of hardware technology, more and more load balancing hardware devices emerge, such as F5 big-IP, Citrix NetScaler, Radware and so on, although can solve the problem, but its high price is often prohibitive, So load balancing software is still the perfect choice for most companies. Nginx as a rising star of webserver, its excellent reverse proxy function and

cactiAdvantages of LVS:Good performance, close to hardware equipment network throughput and connection load capacity.LVS's Dr mode, which supports load balancing over a WAN. None of this other load balancing software is currently available.Disadvantages:More heavy. Another community than Nginx active.*************************************************************************************Now the common load balancing in the network is mainly divided into two kinds: one is through hardware, common h

Directory1. Introduction of common cluster environment2, LVS three types of introduction3, LVS various scheduling algorithm introduction1. Introduction of common cluster environmentBefore talking about LVS, say the cluster, depending on the applicable scenario, IT staff may want to run the server longer, preferably 365 days a year, 72 hours a day uninterrupted operation, you may want to run the application faster, and some digital fields need to perform large-scale numerical operations, These al

processing, when your account data is encrypted before it is sent, and at the other end of the network, the presentation layer decrypts the data received. In addition, the presentation layer also needs to decode and encode the image and file format information.layer seventh of the OSI model: The application layer simply means that the application layer is an interface that provides access to network services for operating systems or Web applications, including file transfer, file management, an

LB (load balance) Load Balancer clusterPrinciple: When a user's request comes in, it is sent directly to the dispatcher (Director server), which then distributes the user's request intelligently and evenly to the backend really server (real server) according to the pre-set algorithm. If different machines may request data differently, in order to avoid this situation, use shared storage to ensure that all users request the same data.Common open source software for load balancing is: lvs,keepaliv

Big-ip,radware appdirector, is a hardware-architecture product that enables high processing power. But the expensive price of these products can stop people, so we have a software load balancing scheme. Internet companies commonly used software lb generally have LVs, HAProxy, Nginx and so on. LVS is a core layer of products, mainly in the fourth layer is responsible for packet forwarding, the use of more complex. Haproxy and Nginx are the product of

), generally choose zabbix/cacti monitoring software.Selection of serversAll with stability as the premise and principle, in the case of price can be accepted by the company, you can choose a brand server like IBM and Dell, the quality is guaranteed.When server resources are tight, OpenStack virtualization (KVM) can be deployed, and virtual machines can act as test machines, beta machines, and internal deployment machines to take advantage of machine resources.(2) Load Balancing + selection of h

link, respectively, access to the company network, and then use a dedicated load balancer device for the link load and redundancy, such as foreign F5, radware, domestic deep conviction.However, like the foreign manufacturers of load balancer a more than 10 200,000, the domestic is also in good tens of thousands of a Taiwan. If the average small and medium-sized company, it budget is limited, such equipment is difficult to buy. But also want to achiev

,heardbeat.(3) High-performance computing clusterHigh-performance computing clusters use different computing nodes to assign computational tasks to clusters to improve computing power, and thus are mainly used in the field of scientific computing. The more popular HPC uses the Linux operating system and some other free software to do parallel operations. This cluster configuration is often referred to as Beowulf clusters. Such clusters typically run specific programs to perform hpccluster parall