Original: Intro to Load balancing for developers–the algorithmsReprint: http://blog.gesha.net/archives/205/Posted on Tuesday, March, 11:02 PM
Random: This load balancing method randomly distributes load across the servers available, picking one via random number Gen
I. NLB test environmentSet up an NLB experiment environment as shown in 1. The computer Server is a domain controller and DNS Server, the client and client2 are member servers, and the domain name is ittongluren.com. The IP address of all computer gateways is 192.168.0.1, and the preferred IP address of the DNS server is 192.168.0.2. 2nd NICs are installed on the
step 5th and the COM + component in step 1th).
Deploy the application to a WEB-tier cluster.
Ensure that the Web-tier routing list is established and the COM + component is marked to support load balancing.
Run Default.asp from the client. If you do not work at first, you may be the result of the restart of the IIS Service during component deployment. Please
This blog reposted from: http://blog.csdn.net/u014649204/article/details/25115039
The design of the balancing algorithm directly determines the performance of the cluster in load balancing. Poor design of the algorithm will lead to load imbalance in the cluster. The main task of the general
the policy, add the Snat policy, the source interface is the intranet port, the service pool references the service pool created in the previous step, the rest defaults, and the policy is started after completion.Port mappings:1, create service pool, type Select server, fill in the server IP, port to be mapped2, add the policy, the type is Dnat policy, the source address is 0 destination address for the ex
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 address when parsing this name. Therefore, for the same name, different clients will get differ
server states can be logged in only one int. If the number of servers is greater than 32, you need to request memory in the memory pool to store. Use of this bitmap array can refer to the following code:
Finally, the actual policy code, logic is very simple, code implementation is only 30 lines, directly on the code.
2.2. IP Hash
IP Hash is another nginx built-in load-
different sessionid, on the same Tomcat is also a gap between the SessionID.A more personal experience is to be sure to configure it yourself and carefully observe the output of the two Tomcat controls. Because this article is a reference to the easy implementation of APACHE,TOMCAT cluster and load balancing practice experience, there are more stickers in this book.
Postscript:The WebSphere Application
greatly affected. Because the picture is on the physical hard disk, access to the picture requires frequent I/O operations, so when the number of concurrent users is more and more, I/O operations will become the overall system performance bottlenecks. This time we will consider the image information distributed storage.
Here is an idea for a medium sized business web site for a distributed dynamic storage of picture data and a load-
In fact, whether distributed, data caching, or load balancing, nothing more than to improve the performance of the site bottlenecks, in the site source code does not optimize the situation, load balance can be said to be the most direct means of the 。 In fact, put aside this noun, let go, that is, want users to be able to divert, that is, the access pressure of a
, the type is defined by the Mime.type file include mime.types; Default_type Application/octet-stream; #设定日志格式 #log_format main ' $remote _addr-$remote _user [$time _local] "$request" ' # ' $status $body _bytes_sent "$http _referer" ' # ' "$http _user_agent" $http _x_forwarded_for "; #使用哪种格式的日志 #access_log Logs/access.log Main; #sendfile instruction Specifies whether Nginx calls the Sendfile function (zero copy mode) to output the file, for general applications, sendfile on; #tcp_
version 。
Apache uses a apache_2.2.11-win32-x86-no_ssl.msi. If versions earlier than 2.2Apache Server Load balancer are configured differently, because 2.2.11 and 2.2.8 are integrated with load balancing tools such as jk2, therefore, the configuration is much simpler. I have no specific tests for other versions and ne
1. Cluster 1.1 definition:is a set of independent computer systems that form a loosely coupled multiprocessor system that communicates between processes over a network. Applications can deliver messages over network shared memory for distributed computers.is a group of connected computers, from the outside it is a system, each node can be a different operating system or computer composed of different hardware. A cluster that provides Web services is a large Web
XX Telecom used a single load balancing, 2 VPDN routers to do load balancing, its topology is as follows:
Load balancing equipment divided into 2 network segments, deployed in a serial connection, the top 2 7610 routers, the ne
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
strategy from the point of view of source, take the actual industrial production as a case, compare each load balance strategy, provide reference for Nginx users.
In this section, we'll talk about the problems encountered after using Nginx load Balancing: Session problem file upload download
Typically, server
Load Balancing in ASP. NET sites:
Based on the HTTP protocol, we may find that we have to solve two problems:
First, to achieve load balancing, we need a Load balancer.
You can use DNS round robin to obtain different IP addresses for each DNS query of the same host name that
The purpose of building load balancing and service discovery ServicesAs the business of the website continues to improve, the performance of individual servers becomes increasingly difficult to meet the customer's business needs, so in many cases, multiple server instances and load balancers are needed to meet business
servers is less than 32, all server states can be logged in only one int. If the number of servers is greater than 32, you need to request memory in the memory pool to store. Use of this bitmap array can refer to the following code:
Finally, the actual policy code, logic is very simple, code implementation is only 30 lines, directly on the code.
2.2. IP Hash
IP Hash is another nginx built-in load-
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