radware

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 protocol is widely used, so it is irreplaceable. Its advantage is that there is a professional maint

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

figure, the traditional Routing Server Load balancer is only a load balancing technology. Currently, in the face of complex network application requirements, the independent Routing Server Load balancer device has multiple options: Local Server Load balancer, link Server Load balancer, global Routing Server Load balancer, WAN optimization acceleration, XML acceleration, TCP optimization management, Link Management, and ssl vpn. technical functions. "Server Load balancer" is no longer a simple S

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,

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

not supported (this is silly)There are currently no performance monitoring templates for Nagios 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 comm

Array, the Radware, The implementation of open source software mainly has LVS (work in four layers), Haproxy (four-layer, seven-layer can be achieved, but mainly seven-layer implementation), Nginx (Application layer implementation).Open source solutions for HA clusters include heartbeat, keepalived, Corosync+pacemaker, Cman+rgmanager, and Cman+pacemaker.The HP cluster is used in some special scenarios, which are not discussed here.2, LVS three types

is to manage the decryption and encryption of the data, such as the common system password 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 servi

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

queue. Let's look at how to mirror the pattern to solve the problem of replication, thus improving usability step1: Increase load balancer About load balancers, commercial, such as F5 's 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 genera

protection, to try to do a good job of traffic monitoring (especially nginx/haproxy load machine traffic), 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, an

enterprises are through the leasing of 2 different ISP links, such as a unicom link, a telecommunications 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 a