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Overview
Load Balancing is built on the existing network structure, it provides a cheap, effective, and transparent method to expand the bandwidth of network devices and servers, increase throughput, enhance network data processing capabilities, and improve network flexibility and availability.Prerequisites
You have installed Apache and can run it. The system used in this article is: centos6.2, Apache: Apac
bandwidth consumption of single NIC, competitive network adapter and other shortcomings still exist.
In addition, some routers (especially Cisco products) do not support the automatic creation of unicast IP addresses and multicast mac ARP mappings, which require manual configuration. IGMP multicast (which can only be selected when multicast is selected), in addition to inheriting the benefits of multicasting, NLB sends an IGMP message every 60 seconds, allowing multicast packets to be sent onl
Load balancing is an eternal topic for a large web site. With the rapid development of hardware technology, more and more load balancing hardware devices emerge, such as F5 Big-ip, Citrix netscaler, Radware, etc., although it can solve the problem, but its high price is often prohibitive, So
, the throughput of the cluster system is greatly improved.? VS/DR: That is (virtual server via direct Routing), that is, the use of direct routing technology to implement virtualized servers. Its connection scheduling and management is the same as in Vs/nat and Vs/tun, but its message forwarding method is different, vs/dr by overwriting the request message's MAC address, send the request to real server, and real server to return the response directly to the customer, eliminating the vs/ The IP
Balance", where you can choose the load balancing algorithm: Rotation scheduling, random allocation, URL parameters, request first class. If you do not know what these algorithms do, then go to review the previous article. Apr provides us with the following 7 algorithms:
Weighted round robin According to the weights according to the request data distrib
Balance", where you can choose the load balancing algorithm: Rotation scheduling, random allocation, URL parameters, request first class. If you do not know what these algorithms do, then go to review the previous article. Apr provides us with the following 7 algorithms:
Weighted round robin According to the weights according to the request data distrib
absrtact : For a large web site, load Balancing is the 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, etc., although it can solve the problem, but its high price is often prohibitive, So
will be the request for this service IP all directed to Dr, and Dr received the packet according to the scheduling algorithm, to find the corresponding realserver, Change the destination MAC address to Realserver's Mac and send it to this realserver? At this point, the Realserver receives this packet, it is equal to receive the packet directly from the client, the processing is returned to the client directly? Because Dr wants to change the two-layer header, So the DR and Realserver must be in
can be implemented on the primary server deployment and configuration changes will be automatically synchronized to other servers. After you finish creating the Web farm, we can configure it later in IIS. We can see the status of each Web server by clicking on the servers under each Web farm, whether it is connected properly, etc.At the same time we can click on each Web farm to manage the following functions, here we click on Mono.Configuring the Load
Protocol shunting for outgoing link load balancing in the previous article "outgoing link load also needs intelligent DNS resolution" http://www.bkjia.com/net/201206/136614.html This section describes how to balance the distribution of carrier addresses by controlling DNS resolution to achieve link traffic balancing. I
Original http://nginx.org/en/docs/http/load_balancing.html
This article is translated according to your own understanding
Load Balancing among multiple applications is a commonly used technology to improve resource utilization, increase server throughput, reduce latency, and ensure application fault tolerance. Nginx can serve as an efficient HTTP Load balancer to
Load Balancing cluster (LB)How load Balancing clusters workWhen a user sends a request, the request is not immediately sent to the backend's real server (realservers), but is sent first to the Scheduler or Distributor (Director), and then the director, based on some scheduling algorithm, The request is sent to the back
command: nginx-t
Of course Nginx load Balancing function is also very strong, and it is generally as a seven-tier load balancing (Application protocol layer). Here is a description of the four common settings that are supported by its upstream:
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Options list box. This allows the client to access the Web server in the notebook each time.
When the above settings are completed, the DNS server realizes the Network Load Balancing function, the client's access is shared on each Web server, and the network traffic across the subnet is reduced, which greatly reduces the communication burden of the enterprise network.
Full version:
Now the scale of the
There are many ways to load balance php, here, I will introduce you to PHP load balancing, if not much to say, we will take a direct look at the implementation of PHP load balancing.
1. php files
The first question is, if you have a large number of small servers, how do yo
Linux: Round Robin algorithm, Active-Backup algorithm, MAC address XOR algorithm (MAC-XOR ). The following is a simple analysis of the three main algorithms.
3.2.1 Rotation Algorithm
The algorithm is based on the principles of fairness. It selects the sending interface for each data packet to be sent. The main idea of the algorithm is that the first data packet is sent by one interface, another data packet is sent by another interface, and the follow
Not long ago I was in charge of a well-known national manufacturing group's load balancing project. I was deeply touched by the project's application of gslb in a specific environment and learned a lot of related Load Balancing knowledge. Today, let's calm down and think about how to learn a lot through the project. du
There is a big difference between cluster, distributed and load Balancing in PHP, the following article I will give you specific to write a cluster, distributed and load-balanced between the specific differences, say not much, let us take a look at it.
The concept of clustering
Computer clusters work closely together to complete calculations with a loosely integ
done first. For more information, see "Linux kernel SMP load Balancing", here are just a few brief generalizations.Plainly, kernel load balance do one thing: let the system in the running state of the process as far as possible to be allocated, in each of the dispatch field to see is balance. How do you understand it? Now the CPU structure generally has: physica
way, and the server cluster software implemented in this way is less. In some cases, CGI (including the use of fastcgi or Mod_perl extensions to improve performance) can be emulated to share the load, while the Web server remains simple and efficient, and the task of avoiding the location cycle will be borne by the user's CGI program.
2. Load balancing of Base D
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