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But if the site has an average of more than 200 requests per second, then the problem is: This is already the best Web server, what should I do? The same scenario applies to the database. To solve this problem, we need to understand the principle of "load balancing". How Web servers do load Balancing The most importa
There are several ways to load balance:one, based on the client way:Each client program has a certain knowledge of the server cluster, which in turn sends requests to different servers in a load-balanced manner. This approach is primitive, and now some older systems are still using this approach, and the client simply uses polling to achieve load
server during the same session, and implement session stickiness.Disadvantage: The session is lost after the target server is down;3.5 weightingOn the basis of polling, random, least-link, Hash ' Algorithms, the load server is allocated by weighting the way.Advantages: According to the weight, the number of requests to adjust the forwarding server;Cons: use is relatively complex;Four, hardware load balanci
following point in time:1, non-running normal processes become real-time processes (such as through the Sched_setscheduler system call);2, after the dispatch (there may be a real-time process is preempted by higher priority real-time processes);3, the real-time process is awakened, if not immediately run on the current CPU (it is not the current CPU on the highest priority process);It seems that the load balancin
services listening for service requests and allowing multiple application instances to run at the same time. The core of NLB is the Wlbs.sys filter driver that sits between the network adapter driver and the network layer. NLB distributes each IP packet to all cluster nodes and makes a unified decision about the packet's source address, destination address, Transport layer protocol, port, configuration parameters of the cluster, and the algorithm to be processed by one node while the other node
Nginx/lvs/haproxy is currently the most widely used three load balancing software, I have been implemented in a number of projects, reference to some information, combined with some of their own experience, summed up.The general use of load balancing is to use different technologies depending on the stage of the site's
Comparison of haproxy lvs nginx Load Balancing For the software that implements load balancing, let's take a look at it in detail. In terms of performance and stability, LVS is the best, basically reaching 60% of the performance of F5 hardware equipment, and other 10% are a little difficult. However, the configuration
theHTTPdefined, and by theHTTPAgents andWebThe server is implemented together. Very simple, whenHTTPagents (such as browsers) toWebThe server requests aURLafter theWebServer can passHTTPin the response header information Locationtag to return a newURL, which meansHTTPthe agent needs to continue to request this newURL, this completes the automatic jump. Of course, if you write yourself aHTTPProxy, nor can it support redirection, which isWebreturned by the server LocationMark to turn a blind eye,
Http://publish.it168.com/2006/0315/20060315030001.shtml 1. DNS load balancing method The RR-DNS (round-robin Domain Name System) takes turns by: In a DNS server,You can configure the same name for multiple IP addresses. When the client queries this name, it will get an addre
default route of the link, of course, you can also do NAT on both routers, through DNS to control the external traffic access, when doing PBR also exclude the local server address, if there is VPN traffic, Also pay attention to the control of VPN traffic. Using PBR to implement VLAN-based load Balancing PBR (policy-based Routing) policy-based routi
quickly filled up, causing congestion on the link, however, live video transmission is poor. This is because the link speed test is not performed for each access. If the test is performed for each access, the time consumed by the test must be greater than the network latency; Periodic detection often results in different network environment changes from the initial detection results during the cycle. If the applications that watch the live video of the event appear in a centralized manner durin
.--------------------------------------------------------------------------------------------------------------- ---------|1) Load Balancing Boss gave Xiaoming a lot of tasks, Xiao Ming found how to arrange the time also do not finish, so he stared at the side secretly watching the movie, Xiao Qiang suddenly feel behind a coolness, a look back xiaoming a face bad smile looked at him, "These several tasks t
Application Load Balancing LVS (I): Basic Concepts and three modes Directory:1. LVS Introduction2. How LVS-ipvs works2.1 VS/NAT Mode2.2 VS/TUN Mode2.3 VS/DR Mode2.4 Comparison of Three lvs-ipvs Modes3. ARP problems in VS/TUN and VS/DR Modes4. LVS Load Balancing Scheduling Algorithm In website architecture, Server
support LVS without any setup, and FreeBSD as a director server is not a lot of applications, performance is not very good. For real Server, almost all system platforms, Linux, Windows, Solaris, AIX, BSD series can be very well supported.Load balancing and load scheduling algorithm1. There are many implementations of IP load
optimize.--------------------------------------------------------------------------------------------------------------- ---------|1) Load BalancingBoss gave Xiaoming a lot of tasks, Xiao Ming found how to arrange the time also do not finish, so he stared at the side secretly watching the movie, Xiao Qiang suddenly feel behind a coolness, a look back xiaoming a face bad smile looked at him, "These several tasks to you, evening please you eat, otherwi
First, HAProxyHardware-based load balancing devices: F5,BIG-IP, etc.Software-based load balancing products: Haproxy,lvs,nginx, etc.In the software load balancing product, it is divided into system-based soft
member (node) in the queue has the same status. The rotation method simply rotates and selects members in the group. In the load balancing environment, the balancer sends new requests to the next node in the node queue in turn. In this continuous and cyclical manner, each cluster node is selected in turn under the same status. This algorithm is widely used in DNS
From: http://hi.baidu.com/_kouu/item/479891211a84e3c9a5275ad9 In an SMP (symmetric multi-processor) Environment, each CPU corresponds to a run_queue (executable Queue ). If a process is in the task_running state (executable State), it will be added to one of the run_queue (and will only be added to one run_queue at the same time ), so that the scheduler can schedule it to run on the CPU corresponding to run_queue.A cpu corresponds to a run_queue design, which has the following advantages:1. A pr
When the vertical expansion of the Web server becomes expensive or difficult, we need to consider the level of server expansion, namely load balancing technology. There are many techniques for load balancing, which we'll cover here.1.HTTP redirectionWe can do this at the code level by setting access to specific pages s
) Cluster virtual IP: 192.168.1.99 Host Name: www.beyond.com ...... I like beyond, so ......) The company stipulates that you should plan and be prepared to do things. I. Currently, it is a network load balancing cluster for Web Services, so :( 1) build a web site. Temporarily omitted! (2) DNS server, domain name resolution; reference: Detailed configuratio
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